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Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
Table of Contents
0. Preparation for Alignment............................................................................................................. 2
1. B+ Adjustment (For function test station only) ............................................................................ 2
2. Geometry Adjustment ................................................................................................................... 2
3. Background Adjustment................................................................................................................ 3
4. Foreground Adjustment ................................................................................................................ 3
5. Final Check ................................................................................................................................... 3
6. Focus Adjustment ......................................................................................................................... 4
7. Convergence Adjustment .............................................................................................................. 4
8. Power Saving Function Check ...................................................................................................... 4
9. Geometry Specification for Production Line ................................................................................ 5
10. Eyelet parts.................................................................................................................................. 5
11. Touch-up parts ............................................................................................................................ 7
12. Glue parts .................................................................................................................................... 8
13. Wire Dressing parts..................................................................................................................... 9
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Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
0. Preparation for Alignment
a.
b.
c.
Pre-set all VRs to the center position except R/G/B bias VR101, 102, 103 counterclockwise to
maximum.
Set up unit and keep it warm up at least 15 minutes.
Preset mode
IBM VGA
640X480
31.5KHz/60Hz
IBM VGA
640X400
31.5KHz/70Hz
6448A
640X480
37.5KHz/75Hz
SVGA4
800X600
46.88KHz/75Hz
SVGA3
800X600
48.09KHz/72Hz
SVGA5
800X600
53.6KHz/85Hz
1. B+ Adjustment : (For function test station only)
Enter factory area -- Press "SELECT +" and "ADJUST-" at the same time then turn power
switch on.
b. Press "ADJUST +" and "ADJUST -" at the same time to clear user area.
c. Input mode 31.5KHz (VGA 640x480) with tilt adjustment pattern.
d. Adjust CRT screw to meet tilt and orthogonal spec. ( Tilt < ±1 mm , Orthogonal < ±1.5mm )
a.
2. Geometry Adjustment
Input mode 53.6KHz (SVGA5) with cross hatch pattern.
Press "SELECT +" and "ADJUST -" keys at a same time.
Adjust switching power supply VR601 to make the horizontal B+ to be 50.0 +/- 0.2VDC.
a.
b.
c.
e.
f.
g.
Input the presetting modes and supporting modes with full white pattern.
Set external contrast to maximum and brightness to raster just cut-off position.
Press "SELECT +" or "SELECT -" to select the adjustment for H-size, H-phase, V-size,
V-center, Pincushion or Trapezoid.
h. Press "ADJUST +" or "ADJUST -" to make the geometry can meet item 9 table 2 spec.
i. Press "SELECT +" and "ADJUST -" at the same time to save the adjustment data.
j. Change timing to next mode and repeat step f, g and h.
k. After all modes are adjusted OK, turn power switch off.
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Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
3. Background Adjustment
Enter factory area -- Press "SELECT +" and "ADJUST -" at the same time then turn power
switch on.
b. Input mode 53.6KHz (SVGA5) with raster only pattern.
c. Adjust external brightness key to maximum.
d. Check the bias VRs of VR101, 102, 103 at counterclockwise maximum position.
e. Adjust screen VR of FBT to obtain twilight raster about 0.7 to 1.2 Ft-L.
f. See which gun appears first, then adjust the two bias VRs of the other two non-appearing guns to
achieve the color temperature meet specification x=0.281 +/- 0.005
y=0.311 +/- 0.005
g. Adjust screen VR of FBT again to let the raster about 0.7 to 1.2 Ft-L.
a.
4. Foreground Adjustment
a. Input mode 53.6KHz (SVGA5) with 3-inch block pattern.
b. Check the drive VRs of VR104, 105 at center position.
c. Adjust external brightness key to cut-off and external contrast key to let the light output be 15
Ft-L,
d. Adjust VR103, 104 to let the color temperature meet the specification x=0.281 +/- 0.003
y=0.311 +/- 0.003
e. Adjust external contrast key to let light output be 45±3 Ft-L.
f. Press "SELECT +" and "ADJUST -" to save the adjustment data.
g. Adjust VR301 to let light output be 31±0.5 Ft-L.
h. Turn power switch off.
5. Final Check
a.
Enter final check area -- press "SELECT +" and "ADJUST +" at the same time then turn power
switch on.
b. Input mode 53.6KHz (SVGA5) with full white pattern.
c. Press "SELECT +" and "ADJUST -" keys at a same time.
d. Check the light output is greater than 30Ft.L.
e. Adjust external contrast and brightness keys to minimum, the video and raster should be
disappear.
f. Check the performance of all modes can meet spec.
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Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
6. Focus Adjustment
a. Input mode 53.6KHz (SVGA5) with characters pattern.
b. Press "SELECT +" and "ADJUST -" keys at a same time.
c. Adjust focus VR of FBT to make "A" area focus clear.
A
video
raster
7. Convergence Adjustment
D
B
a. Input mode 53.6KHz (SVGA5) with purple cross hatch pattern.
b. Adjust 4-pole magnetic ring of Yoke to meet specification.
c. Input mode 53.6KHz (SVGA5) with yellow cross hatch pattern.
d. Adjust 6-pole magnetic ring of Yoke to meet specification.
e. Input mode 53.6KHz (SVGA5) with white cross hatch pattern.
f. Re-confirm the mis-convergence can meet spec.
A
C
E
A ≦ 0.2 mm
B,C,D,E ≦ 0.3 mm
8. Power Saving Function Check
a. Input mode 53.6KHz (SVGA5) with full white pattern.
b. Set external contrast and brightness keys to maximum position.
c. Remove H-Sync only, the video and raster should be extinguished. The LED shows amber color
and the power consumption should be less than 60W.
d. Remove V-Sync only, the video and raster should be extinguished. The LED shows amber
color and the power consumption should be less than 5W.
e. Remove both H and V Sync, the power consumption should be less than 5W and LED shows
amber color.
f. Input H-Sync and V-Sync, the video should be exhibited again and LED on (green).
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Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
9. Geometry Specification for Production Line
(Table 2)
SPECIFICATION
1
HORI SIZE
270 ±4 mm
2
VERT SIZE
202 ±4 mm
3
SIDE PIN
≦ 2.0 mm
4
TOP/BOTTOM PIN
≦ 1.0 mm
5
SIDE BARREL
≦ 1.0 mm
6
TOP/BOTTOM BARREL
≦ 1.0 mm
7
TRAPEZOID
≦ 1.0 mm
8
VIDEO OFFSET
≦ 4.0 mm
9
PARALLELGRAM
10
HORI LINEARITY
11
VERT LINEARITY
≦ 5%
≦ 5%
1. Q602 Heat sink
≦ 2.0 mm
10. Eyelet parts
DESCRIPTION
ITEM
5
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
2. T303
M101 CRT socket
4.
3. IC202 Heat sink/ T302
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Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
11. Touch-up parts
The component listed below must touch-up to avoid solder crack.
1. Q310: 3 points
2. D307: 3 points
L302: 2 points
4.
CN601: 3 points
3.
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Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Q602: 3 points
C612: 2 points
7.
M101: 8 points
5.
6.
Chapter 3 Alignment Procedure
12. Glue parts
1. G2 & G4 VR add glue to fix the position of VR
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Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
2. R607 add glue to fix the Heat sink
13. Wire Dressing parts
1. Left side view:
2.
Right side view:
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Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
3. Rear side view:
Left/Bottom degaussing fixed
5.
Right/Bottom degaussing fixed
4.
10
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
Table of Contents
0 Introduction ................................................................................................................................... 2
1 Electrical Characteristics............................................................................................................... 2
1.1 Power Supply ..................................................................................................................... 2
1.2 Signal Interface................................................................................................................... 2
1.3 Scan Range......................................................................................................................... 2
1.4 Video Performance............................................................................................................. 3
1.5 Timings............................................................................................................................... 3
2 Environment & Reliability............................................................................................................ 4
3 CRT Characteristics ...................................................................................................................... 5
4 Front of Screen.............................................................................................................................. 5
4.1 Geometry............................................................................................................................ 5
4.2 Sharpness Crispness ........................................................................................................... 6
4.3 Light Quality ...................................................................................................................... 6
4.4 Image Stability.................................................................................................................... 6
5 User Controls ................................................................................................................................ 6
5.1 Basic ................................................................................................................................... 6
5.2 Advanced............................................................................................................................ 7
6 Mechanical Characteristics ........................................................................................................... 8
6.1 Dimension .......................................................................................................................... 8
6.2 Weight ................................................................................................................................ 8
6.3 Plastic ................................................................................................................................. 8
6.4 Carton ................................................................................................................................. 8
7 Pallet & Shipment ......................................................................................................................... 9
7.1 Dimension .......................................................................................................................... 9
7.2 Shipping Container............................................................................................................. 9
7.3 Air Transport Container ..................................................................................................... 9
8 Certification .................................................................................................................................. 10
8.1 Environment ....................................................................................................................... 10
8.2 PC-Monitor ........................................................................................................................ 10
8.3 Safety.................................................................................................................................. 10
8.4 EMC ................................................................................................................................... 10
8.5 X-Ray Requirement............................................................................................................ 11
8.6 Ergonomics......................................................................................................................... 11
9 Appendix Table............................................................................................................................. 12
Table 1 - DDC Table................................................................................................................ 12
Table 2 – Geometry Fig............................................................................................................ 17
Fig.1 Linearity Measurements ...................................................................................... 17
Fig.2 General Pincushion Measurements ..................................................................... 18
Fig.3 Trapezoid Measurements .................................................................................... 19
Fig.4 Picture Distortion & Phase Measurements ........................................................... 20
1
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
0 Introduction
The subject model is designed for a value line 15” color monitor. It has the following figures :
0.28mm dot pitch CRT, 65MHz video bandwidth, 1024x768 max resolution.
Low radiation MPRII.
1 Electrical Characteristics
Input Current
Spec
Universal input full range
90~264VAC /47~63Hz
√
90 ~ 264VAC
2.0 Arms
√
On
< 75 W max
√
LED : Green
Standby
<5W
√
LED : Amber
Suspend
<5W
√
LED : Amber
<5W
√
LED : Amber
40 Amp peak
√
cold-start
Power consumption
DPMS
110 VAC/50Hz
Leakage Current
264 VAC/50Hz
Pin assignment
Video input
Sync input
Signal Cable
√
w/o damage
√
< 0.1 ohm
Length : 1800 mm
Color : Flint Gray
Condition
Spec
1.2 Signal Interface
< 3.5mA
2. Ground test : 30A, 1sec
√
TTL-Positive/Negative
√
Impedance
50 Ohm on H-sync cable
√
D-Sub
1.5M +/- 20mm
√
Remark
0.7μs<H-sync width<25% of H
period
2μs<V-sync width< 400μs
√
BNC
1.3 Scan Range
KC-003
OK N.A
700mV / 75 Ohm
Color
(in-line test)
√
√
Level / Impedance
Remark
(in-lab test)
5V on Pin 9
Power cord
1. 1500VAC, 1 sec
Hi-Pot
Off
Inrush Current
OK N.A
Voltage
Condition
1.1 Power Supply
Flint Gray
Spec
√
OK N.A
Horizontal
30 ~ 54 KHz
√
Vertical
50~ 120 Hz
√
Remark
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Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
1.4 Video Performance
Condition
Spec
OK N.A
65 MHz
√
1024 x 768
√
10 ns
√
Video Ringing
15% max
√
Sag
5% max
√
Bandwidth -3db
65 MHz
√
DDC1/2B
√
Ver 2 ,Rev 1, Ver 3
√
Dot Rate
Max. Resolution
Rise time/Fall time
DDC Version
EDID
1.5 Timings
see table 1
User mode No.: 10
Fh (KHz) / Fv (Hz)
VGA400
640x400
31.47KHz/70Hz
√
VGA480
640x480
31.47KHz/59.94Hz
√
6448A
640X480
37.5KHz/75Hz
6448B
640X480
43.269KHz/85Hz
SVGA4
800x600
46.88KHz/75Hz
√
UVGA1
1024x768
48.3KHz/60Hz
√
SVGA5
800x600
53.67KHz/85Hz
√
Apple 16”
832x624
49.71KHz/74.533Hz
√
UVGA2
1024x768
56.476KHz/70.069Hz
√
UVGA7
1024x768
60.023KHz/75.029Hz
√
1024x768
60.24KHz/75Hz
√
1024x768
68.68KHz/85Hz
√
VESA-XGA
1280x1024
63.981KHz/60.020Hz
√
WS7
1280x1024
79.98KHz/75Hz
√
WS8
1280x1024
91.15KHz/85Hz
√
VESA1600
1600x1200
93.75KHz/75Hz
√
UVGA8
Super MAC 19
Resolution
Preset
Preset mode No.: 6
Remark
OK N.A
Remark
√
√
3
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
2 Environment & Reliability
Condition
Spec
OK N.A
Remark
Operation Temp./Humidity
+10 ~ +40℃/ 20~90% R.H.
√
Non-condensing
Non- Operation Temp./Humi.
-20~ +60℃/ 10~95% R.H.
√
Non-condensing
Altitude
Operating condition
0~3048m (10,000ft)
√
Without packing
Non-operating condition
0~12,192m (40,000ft)
√
With packing
5 ~ 26.6Hz /0.6g
√
Vibration
1)Sine
Wave Package, Non-Operating
Vibration
26.6 ~ 50Hz /0.016”
50~500Hz/ 2.0g
(10 Minutes/Axis for x, y, z)
Package, Non-Operating 5 ~ 100Hz, 0 dB/Oct.
2
√
0.015g /Hz
2)Random Vibration
100 ~ 200Hz, -6 dB/Oct., ---------- ,
200Hz,
0.0038g2/Hz
20Hz~2000/ 0.0185g2/Hz
Non-package,
√
Non-Operating
Acoustical Noise
Power Line Transient
IEC801-2 standard
Electrostatic Discharge
Package, Non-Operating
Drop (With packing)
13.7kg - 76cm Height
√
1 corner, 3 edges, 6 faces.
Contact:8KV, Air:15KV
√
< 40 dB/A
√
IEC801-4,IEC1000-4-4 Coupling clamp 0 ~ 4KV
IEC1000-4-5 (Surge)
Common:2KV,Differential:1KV
IEC1000-4-12 (100KHz
Common:3KV,Differential:1KV
0.5~8KV tip table no blanking
√
√
√
ringwave)
MTBF Demonstration
MTBF Prediction
CRT Life
90% confidence level
> 60,000 Hrs
√
Excluding the CRT
MIL-217F
> 40,000 Hrs
√
Excluding the CRT
78% degradation
> 10000 Hrs
√
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Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
3 CRT Characteristics
Spec
OK N.A
CRT Vender
PHILIPS
√
Technology
FST
√
Coating
Anti-glass/Anti-static
√
Dot pitch
0.28mm
√
Phosphor
P22
√
Light transmittance
57%
√
Viewable size
> 14”
√
Deflection angle
90 deg
√
Blemishes and scratches
√
see table 2
1 trio missing, as approval sheet
Remark
4.1 Geometry
Northern Hemisphere
H = 0 + 0.05
Magnetic Environment
4 Front of Screen
Southern Hemisphere
Centering
Geometric Distortion
Linearity
√
V = +0.45 + 0.05
H = 0 + 0.05
√
V = -0.45 + 0.05
H = 0 + 0.05
√
V = 0 + 0.05
Hor.
270 + 4 mm
√
Ver.
202 + 4 mm
√
Hor. & Ver.
|A-B|,|C-D|< 4 mm
√
Top/Bottom / Side Pincushion
< 2 mm
√
Top/Bottom / Side Barreling
< 2 mm
√
Hor./Ver. Trapezoid
< 2 mm
√
Tilt
< 1.5 mm
√
Orthogonal
< 2 mm
√
S-curve
Total distortion <1.0mm
√
Max peak distortion <1.5mm
Hor. & Ver.
<5%
√
(Xmax-Xmin)/( Xmax+Xmin)*100
Size
Remark
Equatorial
OK N.A
See table 4
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Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
4.2 Sharpness Crispness
Focus
OK N.A
Reverse character(white
“e,w,m” at cut-off and
background and black
800 x 600 resolution
√
Remark
The distance of watch is 30cm
from eyes to screen
characters)
A < 0.3mm ,B< 0.4mm
√
no visible moire
√
not permitted
√
”
DIN 66234 T2
< 0.1mm
√
”
Condition
Spec
Full white center
x = 0.281 + 0.010
(Brit. cut-off & Cont.
y = 0.311 + 0.010
Mis-convergence
Moire
Over 25Ft-L
Swing
Jitter
4.3 Light Quality
White Balance
OK N.A
√
Remark
@ UVGA5 800x600
53.6KHz/85Hz
< 0.015
X max-X min & Y max-Y
Purity W,R,G,B
max.)
min
√
”
Brightness cut off
x, y (nominal) + 0.015
√
”
Max Brightness with ABL
Full white pattern
28Ft-L min.(Cut-off)
√
”
40Ft-L min.(Cut-off)
√
”
> 70% (center to corner)
√
”
4.4 Image Stability
H/V regulation
Flicker
Ringing
Contrast ratio
Bright./Cont. Max.
0.5 ~ 1.5Ft-L
√
”
Max/Min
5:1
√
”
Raster light O/P
Full white pattern
Brightness Uniformity
3” Block
Max Brightness no ABL
Color Tracking
OK N.A
< 1 mm per side at cut-off
√
No flicker
√
No visible DY Hor. Video ringing
√
Remark
5 User Controls
5.1 Basic
Function
Spec
OK N.A
Power Switch
√
Contrast
√
Brightness
√
H Size
√
H Position
√
V Size
√
V Position
√
Barrel/Pincushion
√
Remark
6
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
√
Parallelogram
√
Trapezoid
√
I-Key
Function
Spec
OK N.A
OSD position
√
Color Gain
√
Corner
√
Pin-balance
√
Tilt
√
Color Temp. C1, C2
Remark
√
9300K, 6500K
√
Manual Degauss
√
Recall
5 languages
Languages
Mis-Convergence adj.
√
√
√
D-sub/BNC switch
Moire adj.
√
5.2 Advanced
7
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
6 Mechanical Characteristics
6.1 Dimension
Spec
Bezel opening
OK N.A
212 x 283 mm
√
Monitor w/o Stand
L x W x H mm
384 x 361 x 331 mm
√
Monitor w Stand
L x W x H mm
384 x 361 x 384.7 mm
√
Carton Box (outside)
L x W x H mm
474 x 440 x 420 mm
√
Tilt : -4.5/+12.5 degree
√
Tilt and Swivel range
Remark
Swivel:- 45/ +45 degrees
6.2 Weight
Spec
Monitor (Net)
12.0
√
Monitor w packaging
13.7
√
Spec
6.3 Plastic
Flammability
ABS
ABS
6.4 Carton
√
√
MPR2 : ABS
TCO : PC + ABS
RE-6625
√
Light Gray
√
Spec
OK N.A
√
Material
A B Flute
√
Compression strength
530 KGF
√
18 KGF/cm2
√
7 Layers
√
Burst Strength
Stacked quantity
MPR2 Model
√
Kraft
Color
Remark
TCO Model
Delta E< 1.5 after 300Hr Xted test
Color
Texture
65 ℃
Delta E< 5 after 300Hr Xted test
PC + ABS
Resin
√
Remark
70 ℃
PC + ABS
UV stability
OK N.A
UL 94-V0
Heat deflection To
(Gross)
OK N.A
Remark
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Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
7 Pallet & Shipment
7.1 Dimension
Transport Type
Pallet A
Pallet B
Pallet C
Length
1422
X
X
Dimension(mm)
Width
880
X
X
Height
120
X
X
Air Transport Pallet
Length
1422
X
X
Dimension(mm)
Width
880
X
X
Height
120
X
X
7.2 Shipping Container
Quantity of products
(sets)
(Every container)
(Every Pallet)
(Every Container)
Pallet A: 30
Pallet A: 10
Pallet B: X
Pallet B:
630
Pallet A: 30
Pallet A: 21
Pallet B: X
Pallet B: X
X
X
X
X
X
X
X
X
Quantity of products
Quantity of Products
Quantity of pallet (sets)
(sets)
(sets)
(Every Container)
(Every container)
(Every Pallet)
300
40'
20'
Without pallet
With pallet
Quantity of pallet (sets)
(sets)
20'
Quantity of Products
Stowing Type
Shipping Pallet
40'
7.3 Air Transport Container
Container Type
Container
3048
* 2286 * 2438
Pallet A:
30
Pallet A: 4
Pallet B:
X
Pallet B: X
120
9
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
8 Certification
8.1 Environment
Condition
Spec
Green design
OK N.A
ACM Doc. 715-C49
√
ISO14000 Requirement
German Standard
√
E-2000
Switzerland
√
NUTEK
Swedish Standard
√
USA Standard
√
Blue Angel
EPA
Remark
√
EN61000-3-2
Harmonics
TCO92/95
√
TCO99
√
Condition
Spec
PC98/99
Microsoft Windows
DPMS
DDC 1/2B
√
Version 3.0
√
Spec
DNSF
IEC950
CSA (Canada)
√
C22.2 No. 950-M89
√
EN60950
√
+A1+A2+A3+A4
√
+A1+A2+A3+A4
√
rd
EN60950
OK N.A
UL 1950 3 edition
UL (USA)
73/23/EEC
√
CB (Nordics)
√
TUV/GS
EN60950
√
EIAJ/JEIDA (Japan)
√
NOM (Mexico)
√
IAA (Korea)
√
Condition
Spec
OK N.A
89/336/EEC
√
FCC (USA)
Class B
√
EN55022
Class B
√
CISPR 22
Class B
√
VCCI (Japan)
Class B
√
CE Mark
Remark
√
CCIB (China)
8.4 EMC
√
External
Condition
Remark
√
VESA
USB
8.3 Safety
OK N.A
8.2 PC-Monitor
Remark
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Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
√
BCIQ (Taiwan)
C-Tick (Australia)
AS3548
√
√
RRL (Korean)
8.5 X-Ray Requirement
Condition
Spec
DHHS (21 CFR)
OK N.A
USA X- Ray Standard
√
√
DNHW
PTB
German X- Ray standard
√
√
MPRII
√
MPRIII
Condition
Spec
ZH1/618
OK N.A
German ergonomic
Remark
√
√
ISO 9241-3 -7 & 8
8.6 Ergonomics
Remark
11
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
9 Appendix Table
Description
ID Manufacturer Name =ACM
(EISA 3 character ID)
ID Product Code = V551
(Vender Assigned code)
ID Serial Number
32 bits serial no.
(use 0 if n/a)
Header
Week of Manufacture (0-53),use 0 if n/a
Year of Manufacture (year - 1990)
EDID version = 1
Revision = 1
Video Input Define
(see Note 1)
Max. H. Image Size (270 mm)
Max. V. Image Size (202 mm)
(gamma*100) - 100
(see Note 3)
DPMS
(see Note 2)
Red Green Bits Rx1Rx0Ry1Ry0Gx1Gx0Gy1Gy0
Blue White Bits Bx1Bx0By1By0Wx1Wx0Wy1Wy0
Red x bit9-2
Red y bit9-2
Green x bit9-2
(see Note 3)
Green y bits9-2
Blue x bit9-2
Blue y bit9-2
White x bit9-2
White y bit9-2
Established Timing I
Established Timing II
Established Timing III
(see Note 4)
#1 Standard Timing Identification
800*600 85Hz
Table 1 - DDC Table
Address
Data
00
00
01
FF
02
FF
03
FF
04
FF
05
FF
06
FF
07
00
08
06
09
09
0A
02
0B
00
0C
*
0D
*
0E
*
0F
*
10
*
11
*
12
01
13
01
14
08
15
1B
16
14
17
*
18
E8
19
*
1A
*
1B
*
1C
*
1D
*
1E
*
1F
*
20
*
21
*
22
*
23
A4
24
48
25
00
26
45
27
59
12
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
Description
#2
#3
#4
#5
#6
#7
Detailed Timing Description # 1
#8
Data
01
01
01
01
01
01
01
01
01
01
01
01
01
01
00
00
00
FE
00
4D
6F
6E
69
74
6F
72
0A
20
00
00
00
FE
00
4D
6F
6E
69
74
6F
72
0A
20
20
Address
28
29
2A
2B
2C
2D
2E
2F
30
31
32
33
34
35
36
37
38
39
3A
3B
3C
3D
3E
3F
40
41
42
43~47
48
49
4A
4B
4C
4D
4E
4F
50
51
52
53
54
55
56
Detailed Timing Description # 2
13
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
Description
Detailed Timing Description # 3
Detailed Timing Description #4
Data
20
20
20
00
00
00
FE
00
4D
6F
6E
69
74
6F
72
0A
20
20
20
20
20
00
00
00
FE
00
4D
6F
6E
69
74
6F
72
0A
20
20
20
20
20
00
*
Address
57
58
59
5A
5B
5C
5D
5E
5F
60
61
62
63
64
65
66
67
68
69
6A
6B
6C
6D
6E
6F
70
71
72
73
74
75
76
77
78
79
7A
7B
7C
7D
7E
7F
Extension Flag
Check sum
14
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
Note 1
Bit
7
6
5
4
3
2
1
0
Description
Analog / Digital Input : Defines usage of the rest if the byte as "analog input" or
digital input". Analog=0, Digital=1 . If input is described as analog, the following
definitions apply to bits 6-0. Digital is as yet undefined in the following but
provisions have been made in anticipation of a common video output standard for
Flat Panel Display (FPD) use.
Bit
7
Bit Description
Analog / Digital Signal Level
Signal Level Standard (6)
Signal Level Standard (5)
Setup
Sync Inputs Supported (3)
Sync Inputs Supported (2)
Sync Inputs Supported (1)
Sync Inputs Supported (0)
4
3:0
5
0
1
0
1
Operation
0.700V/0.300V (1.000V p-p)
0.714V/0.286V (1.000V p-p)
1.000V/0.400V (1.400V p-p)
Reserved; TBD
Bit
Bit 6
0
0
1
1
Signal Level Standard (6:5) : Refer to the following bit definitions. Identified by the
level of reference white volts above blank, followed by the level of the sync tips in
volts below
blank.
6:5
Setup: If set, the display is set to expect a blank-to-black setup or pedestal per the
appropriate signal level standard.
Sync Inputs (See Bit Operation below)
3
Separate Sync
2
Composite Sync (on H Sync line)
1
Sync on Green Video
0
Serration of the V.Sync Pulse is required when composite sync or sync-ongreen video is used
15
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
2
Bit 7
Bit 6
Bit 5
Bit 4:3
Bit
Samsung
7E
CRT Vender Chunghwa
19h
06
1Ah
4E
1Bh
A0
1Ch
57
1Dh
4F
1Eh
97
1Fh
26
20h
10
21h
47
22h
4F
Hitachi
0E
6E
A0
57
48
99
26
10
47
4F
Samsung
FB
BE
A1
55
4B
97
24
10
47
4F
Philips
BB
Orion
E2
Philips
A2
AE
9E
59
4E
99
27
10
47
4F
Orion
07
4E
A0
57
4A
9A
26
10
47
4F
Hitachi
A6
CRT Vender Chunghwa
17h
BC
3
Note
2:0
Stand-by
Suspend
Active off
Display Type
0,0 - Monochrome/gray scale display
0,1 - RGB color display
1,0 - Non-RGB multicolor display (example:RGY)
1,1 - Undefined.
Reserved. Set at 00h until defined.
Note
16
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
Table 2 – Geometry Fig.
Linearity Measurements
X1
X2
X3
X4
X5
X6
X7
X8
X9
X10
X11 ~ X18
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
Y0
Y1
Y2
Y3
Y4
Y7
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
Y9
Y10
Y13
Y12
Y11
+
Xmax - Xmin
------------------Xmax + Xmin
Ymax - Ymin
-------------------
Y8
Y6
Y5
Fig.1
X 100% < 5%
X 100% < 5%
Ymax + Ymin
17
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
Fig.2 General Pincushion Measurements
Amm
a1
P
S
b2
R
a2
Q
Bmm b1
A, B represented as display area width and height
Top/Bottom Pincushion = (a1 or a2)
Side Pincushion = (b1 or b2)
Substituted A by (PS + QR)/2
B by (PQ + RS)/2
18
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
Fig.3 Trapezoid Measurements
2.5
2.5
2.5
2.5
D
A
B
2.5
2.5
2.5
2.5
C
* Each of the 4 corners of picture shall fall within the relevant area (F) illustrated up (hatched)
* ABCD is the picture outlines.
19
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
Fig.4
Picture Distortion & Phase Measurements
H1
A
a1
orthogoal
D1
V1
b2
C
D
V2
b1
D2
a2
Tilt
B
Peak
H2
Total
| H 1 − H 2]
≤ 0.02
0.5( H 1 + H 2)
| V 1 − V 2]
≤ 0.02
0.5(V 1 + V 2)
| D1 − D 2]
≤ 0.03
0.5( D1 + D 2)
20
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
Table of Contents
1. Defection CKT............................................................................................................................. 2
(1) Circuit Diagram of Defection ............................................................................................. 2
(2) Autosync Deflection Controller--TDA4857....................................................................... 3
(3) X-ray protection & AFC(Auto Frequency Control) ........................................................... 3
(4) H-size control circuit .......................................................................................................... 4
(5) Horizontal output circuit..................................................................................................... 5
(6) H-Linear correction circuit ................................................................................................. 6
(7) Step-up CKT....................................................................................................................... 7
(8) Vertical output .................................................................................................................... 8
2. Video CKT................................................................................................................................... 9
(1) Black Diagram of Video..................................................................................................... 9
(2) MM1375XD Block Diagram.............................................................................................. 9
(3) Preamp CKT ....................................................................................................................... 10
(4) Cascode CKT...................................................................................................................... 11
(5) DC Restore CKT ................................................................................................................ 12
(6) ABL CKT: (Auto Brightness Limit)................................................................................ 13
(7) Brightness, V-blank, change mode blank, spot killer CKT ................................................ 14
ACER V551 MICROCONTROLLER CIRCUIT OPERATION THEORY ................................... 15
1. Introduction .......................................................................................................................... 15
2. Block diagram ...................................................................................................................... 15
3. MCU..................................................................................................................................... 15
4. How to detect mode timing .................................................................................................. 16
(1) Vertical sync frequency measurement .................................................................... 16
(2) Horizontal sync frequency measurement ................................................................ 16
5. What are the valid key functions for user............................................................................. 16
6. How to execute the auto alignment function........................................................................ 16
ACER V551 POWER SUPPLY CIRCUIT OPERATION THEORY............................................. 17
(1) Brief : .................................................................................................................................. 17
(2) Circuit Analysis .................................................................................................................. 17
Attachment A ................................................................................................................................... 20
1
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
1. Defection CKT
(1) Circuit Diagram of Defection
+40V
C235
0.1U
50V
(D)
R269
(OPEN)
BLANK
R203
ZD201 100K
30V
Q210
(OPEN)
R268
(OPEN)
+12V
+6.3V
VR201
(OPEN)
(HVADJ)
D201
1N4148
+12V
R206
10K
R208
R265 137K
(OPEN) (1%)
R247
10K
BDRV
HDRV
Q204
H945
EWDRV
R258 180
V1
R259 180
R205
2.2K
C201
100U
25V
(EL)
10
H-SYNC
R202 1K
CLBL
16 15 14 13 12 11
VCC
CLBL
HSYNC
VSYNC
VOUT1
VOUT2
EWDRV
9
8 7
6
5
R201 1K
DGND HDRY
PGNDBDRV
SCL
SDA
R210 100
VSMOD
SGND
HPLL1HBUF
25 26
R252
56K
C207
C206
4700P 0.22U R212
100V 22K
50V (PE)
(1%)
(D)
4
BSENS
TP4
+40V
R217
R219 120K
47U 23.2K (1%)
25V (1%)
(EL)
+C205
3 2 1
R218
51K
(1%)
BOP
XRAY
HFLB
HFLB
R220
2.7K
R222
27K
1/4W
HREF HCAP HPLL2
HSMOD
FOCUS
27
28
29
30 31 32
HSMOD
R223
39K
R215
2.61K
(1%)
R213
10K
C208
0.1U C209
100V 0.33U
(PE) 100V
(PE)
TP3
AFC
R214
2.1K
(1%)
R211
150K
R209 100
24
HUNLOCK
23
R207
6.8K
25V
(EL)
BIN
IC201
TDA4857
VSMOD
ASCOR
VAGC VREF VCAP
HUNLOCK
SCL
SDA
17 18 19 20 21 22
+C223
100U
C202
1500P
100V
(PE)
+
V-SYNC
R204
10
1/2W
(FS)
R257 1.8K
V2
C210
1000P
100V
(PE)
R253 R254
9.1K
47K
C211
O.01U
100V
(PE)
C212
6800P
100V
(PE)
R255 R256
22K (OPEN)
C213
+(OPEN)
50V
(EL)
D203 D204 D205
1N41481N4148(OPEN)
SC2
SC1
SC0
2
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
(2) Autosync Deflection Controller--TDA4857
2.1 pin 1 is AFC feedback .
2.2 pin XRAY: if V XRAY > threshold (6.25V typical) switches the whole IC into protection mode.
2.3 pin 3,4,5,6,8 for B+ control function block.
2.4 pin 11(EWDRV) is a parabolic waveform used for pincushion correction
2.5 pin 16 generates video claming & blanking pulse.
2.6 pin 18,19 is I2C data.
2.7 pin 21 V-regulation.
2.8 the resistor from pin 28 (HREF) to ground determines the maximum oscillator frequency.
2.9 the resistor from pin 27 (HBUF) to pin 28 defines the frequency range.
2.10 pin 31 H-regulation.
2.11 pin 32 focus.
9
8 7
10
6
161514131211
(3) X-ray protection & AFC(Auto Frequency Control)
(a) AFC in other words is HFLB (Horizontal Flyback) IC201 pin1, its for synchronize the
second stage (horizontal deflection) with first stage (input signal H-sync.).
(b) TDA4858 pin2 sense the voltage separated by R217, R218 and R219 from FBT pin9 40V. The
TDA 4857 pin2 trigger voltage is 6.14V. When the FBT pin9 40V increase to let the R219
voltage drop achieve 6.14V, the TDA4857 will shutdown. In the time H.V.=28.5KV.
VCC DGNDHDRY
CLBL
PGND
BDRV
HSYNC
VSYNC
VOUT1
VOUT2
EWDRV
IC201
TDA4857
5
BIN
TP3
TP4
+40V
4
R217 R218
+C205
47UR219120K 51K
25V23.2K
(1%) (1%)
(EL) (1%)
3 2 1
BOP
HFLB
XRAY
BSENS
HFLB
AFC
R220
2.7K
R222
27K
1/4W
ASCOR
VSMOD
VAGCVREFVCAPSGND
HBUF HREF
HCAPHPLL2
HUNLOCK
SCL
SDA
HPLL1
HSMOD
FOCUS
171819202122
23
24
2526 27
28
29
303132
3
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
(4) H-size control circuit
(a) H-size control voltage 0~5V input from "H-SIZE" net.
(b) Q301 is a buffer to separate prior signal and latter.
(c) R328 and D314 series connect to SC1 is used to compensating H-size by different
horizontal frequency (for VGA). The SC0, SC1 status are as follows:
(d) Horizontal size module merge the side-pin compensation waveform coming from Q312
then through Q307 inverting-amplify the modulating wave to control Q302、Q303
Darlington pair to control H-size.
(e) R307 and R308 separate the voltage B+ then provide the different voltage for different
horizontal frequency to H-size modulation circuit.
SC1
1
0
1
0
Fh
SC0
>=45KHz
1
40K ~ 45K
1
45 ~ 40KHz
0
<35KHz
0
Cs truth table
VM
L303
19.40108.011
+5V
C316
3.3U
50V
(BP)
+12V
Q302
A733
R305
33K
Q303
D669A
R302
(SHORT)
1/2W
(FS)
SC2
D319 (OPEN)
R358 (OPEN)
D314 1N4148
R328
150K
D318 1N4148
R327
100K
SC0
SC1
H-SIZE
D321 1N4148
Q301
H945
D315
1N4148
R334
22K
VR302
(SHORT)
(H-SIZE ADJ)
B+
+C320
1U
50V
(EL)
R308
120K
(1%)
R345
10K
Q307
H945
EWDRV
Q312
H945
R346
8.2K
R301
7.5K
R344
18K
R307
300K
1/4W
+12V
R312
3.3K
4
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
(5) Horizontal output circuit
(a) C321 couple the HDRV wave form from TDA4857 pin7 to Q315 for switching signal
and get the energy by R335 and R332 series, then through the driver transformer T301
couple the driver wave form to horizontal transistor Q310 via R336 at plus duty and via
D312 at minus duty.
(b) While the horizontal transistor Q310 switching a cycle, the energy provided from FBT
T303 pin6 B+ be stored in horizontal deflection yoke and tunning capacitor C314. The
deflection sawtooth current through horizontal deflection yoke was generated during
the Q310 at ON cycle provides the plus part and during Q310 at latter OFF cycle
provides the minus part through the flyback diode D307.
(c) R333 and C318 series is a snubber circuit to inhibit spike.
(d) C324, R329, D313 and D310 is used to compensate the cross-over distortion when the
D307 OFF Q310 ON.
HV
C314
4000P
1.5KV
(PPSH)
+50V
+
C321
10U
50V
(EL)
R337
33
1/4W
C339
0.01U
100V
(PE)
C324
0.22U
100V
(PE)
HDRV
R336
0.82
2W
50V
(EL)
D312
1N5817
Q315
C2235
D311
R376
1N4148 (OPEN)
R329
22
1/4W
(FS)
D313
1N4148
G2
H-DY
20.60047.104
R313 R311
(OPEN) 300
1/2W 1/2W
3
+C319
1U
T301
(19.20079.011)
4
R332 3
47
5
1/4W
R333
1
6
510
1/4W
C318
470P
500V
(D)
FOCUS
1
6
2
Q310
BU2508AF
R335
470
1/2W
1
D323
1N4003
D307
FMP-2FU
B+
R338
L302
(OPEN) (LIN-COIL)
19.50059.001
C313
(OPEN)
J303
1KV
(JUMPER)
(D)
11
2
5
12
10
9
2
1
3
D310
RGP10J
8
C315
6800P
630V
(PPN)
L303
19.40108.011
T303
19.70060.001
5
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
(6) H-Linear correction circuit
(a) L302 is Linear coil for linearity correction and C312 is Cs capacitor for deflection
current S correction.
(b) R318 and C313 series that parallel to L302 pin1-2 for ringing inhibit.
The goal of R311 and D323 series is both dismissing ringing bar and good linearity.
(c) Reference to Cs truth table, Fh>45KHz Cs = C312.And Fh<45KHz,then Cs =
C311 parallel to C312
C314
4000P
1.5KV
(PPSH)
1
H-DY
20.60047.104
2
Q310
BU2508AF
C312
0.3U
400V
(MPS)
2
C324
0.22U
100V
(PE)
1
C356
0.27U
250V
(MPS)
Q333
IRF630
R387
1M
D310
RGP10J
C315
6800P
630V
(PPN)
R329
22
1/4W
(FS)
D313
1N4148
D307
FMP-2FU
J303
(JUMPER)
C339
0.01U
100V
(PE)
6
D323
1N4003
3
C313
(OPEN)
1KV
(D)
L303
19.40108.011
R391
100K
2
5
M301 R330
2P (OPEN)
1W
1
2
4
HLIN
C317
+C323 (OPEN)
(OPEN)
50V
50V
(EL)
(D)
R331
(OPEN)
CS1
C311
0.22U
250V
(MPS)
R339
1M
+6.3V
3
R337
33
1/4W
R336
0.82
2W
L302
(LIN-COIL)
19.50059.001
R338
(OPEN)
Q318
(OPEN)
D312
1N5817
5
1
R313 R311
(OPEN) 300
1/2W 1/2W
C322
(OPEN)
250V
(MPS)
Q314
IRF630
R319
(OPEN)
Q304
(OPEN)
R314
100
R389
100
R318
(OPEN)
CS2
C357
0.01U
100V
(PE)
R315
100K
C310
0.01U
100V
(PE)
R316
(OPEN)
D305
1N4005
D356
1N4005
T301
(19.20079.011)
4
3
T302
(LIN-COIL)
(OPEN)
+12V
D306
(OPEN)
+12V
R383
4.7K
Q322
H945
C325
(OPEN)
100V
(PE)
R384
4.7K
Q323
H945
+12V
R385
(OPEN)
Q324
(OPEN)
SC2
R392
39K
R317
39K
SC0
R320
(OPEN)
SC1
6
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
(7) Step-up CKT
(a) B+drive duty pulse comes from TDA4857 pin 6
(b) Q305, Q306 constructed class B output to drive Q317.
(c) When Q317 turns on, L304 storage energy and D317 is off. when Q317 turns off L304
release energy and D317 turns on to charge C326 to B+
(d) The higher Hor. frequency needs higher B+ so B+Drive duty must vary with frequency.
HV
+50V
1
FOCUS
13
C309
0.01U
500V
(D)
D317
BYM26A
BDRV
C363 R363
220P (SHORT)
500V 1/2W
(D)
33U
200V
(EL)
C364
(OPEN)
500V
(D)
2
5
12
10
9
3
Q306
A733
11
+C326
R347
200
R373 Q317
47 IRF630
D316
1N4148
6
Q305
H945
G2
L304
19.40139.001
+12V
8
T303
19.70060.001
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Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
(8) Vertical output
(a) TDA4866 is a vertical deflection amplifier, pin7 need a higher DC voltage (50V
currently) for deflection current amplify.
(b) TDA4866 pin1,2 is vertical drive input pin from TDA4857 pin12,13.
(c) Pin 4,6 is vertical deflection output pin to drive vertical YOKE.
(d) Pin8 provides the vertical blank signal for vertical retrace line canceling.
+50V
+12V
IC202
TDA4866
VP INB
3 2
OUTA
GNDOUTB
6 5 4
VFB
FEEDB
GUARD
9 8 7
INA
1
R227
1
2W
+
V-DY
R231
180
1W
+
4
C233
2200P
50V
(D)
Q201
H945
CLBL
R237
10K
R232
10
1/2W
R228
1
1W
+100U
C214
47P
50V
(D)
R224
820
C232
(OPEN)
50V
(D)
25V
(EL)
R225
820
C231
(OPEN)
50V
(D)
C218
0.22U
100V R229
(PE)
100
V1
V2
C219
0.22U
250V
(EL)
G1
3
C215
C217
0.01U
50V
(D)
C216
100U
100V
(EL)
R233
100
1/2W
(FS) R250
R238 R236 2.4K
68K 10K
(1%)
V+
R262
3.3K
R263
4.7K
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Chapter 2 Circuit Operation Theory
2. Video CKT
(1) Black Diagram of Video
R
Preamp CKT
MM1375XD
IC101
VIDEO
Cascode CKT
Q101,110
Q103,111
Q105,112
B
CONTRAST
(From uC IC801)
ABL CKT
Q316
Clamp CKT
Q 205
G
B
G1
Brightness CKT: Q203
Change Mode Blanking:Q202
V-blanking CKT: Q201
Spot Killer CKT: Q202
Beam Current
(From FBT)
R
(From PC)
G
DC Restore
CKT
H-clamp
(From IC201)
(2) MM1375XD Block Diagram
The function block below represents one of the threevideo amplifiers in the MM1375XD
along with the contrast, gain adjust and brightness contrals. The Contrast Control is DC-Level
(0 ~ 4 V) operate attenuator which controls the video gains of the three channels (R, G, B)
simultaneously The Gain
Adjust Control, which is also a DC-level operated circuit, provides a 6 dB gain adjustment to
each channel. During the retrace period, the Clamp Comparator will charge or discharge the
clamp capacitor by comparing the external brightness (clamp+) level with the video output DC
level thus that the brightness level is maintained.
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Chapter 2 Circuit Operation Theory
(3) Preamp CKT
(a) AS shown in the block diagram:
The R/G/B signals will generate an enough amplitude of Vpp to show up on the CRT
screen after the amplification of the amplifiers.
(b) The purpose of signal CLAMP is to fix the black level of all R.G.B signals to the same
level after the AC couple. This is the DC Restoration of pre-amplify
(c) To fix Pin 1,19,20 voltage is to stabilize Pin 13,15,18 (R,G,B Output) DC voltage.
It’s purpose is to lower the Temp. of IC and transistors of Casecode CKT.
(d) VR104,105 control R.,G O/P gains
+12V
R106
100
1/2W
R109
120
1/2W
C154
(OPEN)
50V
(D)
R137
56K
+8V
C101
0.1U
50V
(D)
D111
1N4148
+
C130
10U
50V
(EL)
R110
3k
ZD107
8.2V
R138
9.1K
BI
+8V
1
22
B-IN
6
BI
5
4
GI
3
2
RI
+8V
R103
75
D115
1N4148
19
GND
5
C102
0.1U
50V
(D)
18
6
C129
0.01U
50V
(D)
R131
390
17
G OUT
GO
R123
390
16
G CUTOFF
R111
4.7K
7
R CLAMP
15
G DRIVE
8
VCC1
C108
0.01U
50V
(D)
BO
R120
4.7
1/4W
GND
R-IN
R178
33
D116
1N4148
+
VCC2
G CLAMP
C105
0.1U
50V
(D)
C118
47U
25V
(EL)
20
B OUT
4
D114
1N4148
C104
0.1U
50V
(D)
VR105
2K
(B-DRV)
B CUTOFF
3
R102
75
RI
C100
(OPEN)
50V
(D)
21
B CLAMP
G-IN
R177
33
2
1
IC101
MM1375XD
M102
6P
20.60010.106
B DRIVE
R176
R101
D112 33
75
C106
1N4148
0.1U
50V
(D)
GI
+8V
C103
0.1U
D113
50V
1N4148
(D)
14
R OUT
9
CONT
10
BLANK
13
R CUTOFF
11
12
CLAMP
R DRIVE
C109
(OPEN)
50V
(D)
R117
390
RO
R142
1.5k
R112
3K
R108
100
VR104
2K
(R-DRV)
CONTRAST
H-BLANK
C110
0.01U
50V
(D)
CLAMP
D100
1N4148
+C122
10U
50V
(EL)
R100
4.7K
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Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
(4) Cascode CKT
(a) Output stage adopts cascode circuit Its purpose is to amplify the signal which has
been processed by MM1375XD to a enough amplitude of Vpp, then display on the
CRT. The criteria to select a cascode transistor is the smaller the value of Cob and the
bigger the value of Ft is better.This circuit adopts HSD1609. Cob=3.8pF, ft=140MHZ.
(b) Cascode CKT concludes 3 band amplification.
Mean Freq.: capacitance open, inductance short. The gain = Rc /Re
High Freq.: (R gun),peaking coil L104,L105,R115,C113,R119
Over Freq. Compensation: (R gun),C161,R161.
L105
2.7U
DC RESTORE
12V
Q101
R115
1.6K
1/4W
HSD1609
C112
0.1U
(OPEN)
R171
R116
Q102
H945
C161
150p
50V
(D)
R117
390
R118
100
1/2W
C113
82P
50V
(D)
(OPEN)
15UH
D101
1SS83
30
L104
R161
8.2K
R119
33
B O/P
R151
1.2K
3W
+75V
R113
R114
56
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Chapter 2 Circuit Operation Theory
(5) DC Restore CKT
(a) The video signal amplified by the output stage is coupled to CRT by way of AC
coupling. So DC restoration CKT is needed to do the white balance adjustment.
(b) Use VR101 & R145 and ZD104 to get the range of each gun bias ( Max ≒ 27 V).
(c) O/P signal mixes DC and AC voltage. Only AC signal passes C150. DC voltage is
generated by VR101 cross voltage.
R134
+
CASCODE
CRT
51
1/2W
C150
1U
100
(EL)
ZD104
33V
VR101
R145
20K
20K
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Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
(6) ABL CKT: (Auto Brightness Limit)
ABL is a protection circuit. When the anode current goes higher than the setting value
of ABL circuit . ABL will pull down the voltage of contrast to limit the anode current. This
is helpful to protect CRT.
HV
1
FOCUS
13
G2
6
+12V
11
R350
30K
12
2
D320
1N4148
R352
100K
ABL
CONT
C307
4700P
50V
(D)
+C333
R340
330
Q316
A733
1U
50V
(EL)
9
R355
10K
1/4W
R351
6.8K
10
D309
1N4148
5
VR301
20K
(ABLADJ)
3
T303
19.70060.001
8
a) With crosshatch patter, FBT beam current is smaller. It makes the voltage of C333 higher
than Vcontrast Q316, is OFF the Vconstrast is freely controlled.
b) With the full white, FBT beam current rises, the voltage of C333 is down. It makes Q316
ON. Vce of Q316 is fixed
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Chapter 2 Circuit Operation Theory
R244+5V
(OPEN)
(1%)
VR202
(SHORT)
(G1ADJ)
50V
(EL)
D202 R239
(OPEN) 4.02K
(1%)
Q202
H945
R243
14K
(1%)
C221
+0.22U
50V
(EL)
Q203
BF423
BRITE
R245
1.8K
(1%)
R266
(OPEN)
+C220
10U
(7) Brightness, V-blank, change mode blank, spot killer CKT
(a) About the cut off voltage, while the voltage, cathode to G1, over the cut off voltage, the
picture will disappear. If the cut off voltage of the CRT G Gun is set at 120V and the
black level of cathode is 55v, the picture want to show the signals higher the black level
once the G1 voltage is lower than -65V.
(b) As described above, we may using the voltage control G1 as the brightness control.
Generally the G1 control range is about 12~15V if the Raster brightness is from 0 to
1.5ft-L.
(c) Similarly, we may overlap a negative pulse of vertical duration on the G1 voltage to
prevent the vertical retrace line from showing on the picture. This is to keep the voltage
cathode to G1 over the cut off voltage during the period of vertical retrace.
(d) In order to prevent the picture occurred transiently while change mode, pull down the
G1 voltage and let the voltage cathode to G1 over CUT OFF voltage. This will make
the picture blanking
(e) While monitor turned off, the discharge speed of high voltage circuit is slow since there
is no deflection scanning , a spot which will destroy the phosphor of CRT will display on
the CKT. So the SPOT KILLER circuit will generate a negative voltage higher than CUT
OFF to the G1 to cut the beam This is to protect the CRT.
ZD203
(OPEN)
+50V
ZD202
(OPEN)
BLANK
R264 D206
4.7K 1N4148
R240
R241 4.7K
33K
VFB
R233
100
1/2W
(FS)
HUNLOCK
R238
68K
GUARD
R236
10K
G1
R267
1M
1/4W
R242
120K
1/2W
+
C219
0.22U
250V
(EL)
-190V
Q201
H945
CLBL
C233
2200P
50V
(D)
R237
10K
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Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
ACER V551 MICROCONTROLLER CIRCUIT OPERATION THEORY
1. Introduction
The microcontroller of the V551 can discriminate the display mode by detecting the frequency of the
H/V sync signals and the polarity of horizontal sync signal. It provides DC voltages to control the
picture and save the adjusted parameters into the EEPROM by using the control panel.
2. Block diagram
The major parts of V551 microcontroller circuit are MCU, EEPROM. The circuit block
diagram is shown as below,
EEPROM
Searching for
the same saved
mode timing
with the input
signals and
get the data.
Preset mode data,
User saved mode
data.
Control Panel
PC
RS232
auto alignment
program
PWM
output
To deflection
circuit
Checking if the
valid key be pressed
and do key function.
Adjust
- +
Select
- +
Blanking
SCO-SC1
Detecting the
input signals
of H,Vsync &
H-polarity.
Hsync
Vsync
H-polarity
MCU (MTV012)
(UART) External
adjustment function
3. MCU
The MCU - MTV012 is an 87C51 microcontroller with PWM outputs. It manages the following
functions,
(1) To detect mode and output proper SC0 and SC1 to deflection circuit.
(2) To check if there is the same saved mode in the EEPROM and get the data to transfer into DC
voltages by PWM output and RC filter circuits to control the picture, contrast and brightness.
(3) To check if there is the valid key be pressed and do the key function.
(4) To memorize mode timings and any adjustable parameters of the picture into EEPROM.
(5) The inner registers and PWM output of MCU can be controlled by the external PC alignment
program.
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Chapter 2 Circuit Operation Theory
4. How to detect mode timing
Only when the mode timing input is stable, we can adjust the picture by the control panel, and the
major measurement of the mode timing inputs are horizontal and vertical sync.
(1) Vertical sync frequency measurement
We use the base timer, it can generate a count during a fixed time, this fixed time is 12/12MHz and
we call it "Time base", so when the first vertical sync generated, we enable the base timer, and the
next vertical sync generated, we disable the base timer, and we only need to calculate how many
counts are during a vertical sync period.
The formula is
Vertical sync frequency
= FV
= 1 / Vertical sync period
Vertical sync frequency = 1000000 / Counts
==>
= 1 / [ Counts * (Time base)]
(2) Horizontal sync frequency measurement
We use the event counter for calculating how many counts are during a long fixed time, because
the vertical sync period is longer than the horizontal sync period, we can enable the event counter
when the first vertical sync generated and disable the event counter when the next vertical sync
generated, this time, we can get the horizontal sync counts during a vertical sync period.
The formula is
Horizontal sync frequency
= FH
= Horizontal sync counts / Vertical sync period
Horizontal sync frequency
==>
= Horizontal sync Counts / Vertical sync period
5. What are the valid key functions for user
Total 4 keys for V551 control panel, "select +" & "select -" are the selection of controlled function
with LED change, and "adjust +" & "adjust -" are the selected item to increase & decrease volume.
Except the last basic key functions, the user can press "select +" & "adjust -" to recall the factory
preset data. Meanwhile it takes about 20 seconds for keeping no key pressed to store the adjusted
function into the user data.
6. How to execute the auto alignment function
The MCU supports the UART function, it has 2 I/O ports, one is the receiver, the other is the
transmitter, they are connected with an interface to PC and PC can execute alignment program by
RS232 communication to send the formatted data to the MCU for adjusting any adjustable
parameters of the picture and saving the adjusted values into EEPROM. By this way, we can get
the products with the same quality and reduce the manufacturing time.
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Chapter 2 Circuit Operation Theory
ACER V551 POWER SUPPLY CIRCUIT OPERATION THEORY
(1) Brief :
Acer V551 is equipped with a current mode, constant frequency, synchronous, using fly back
switching mode power supply circuit,(The operating frequency won't vary with the change of input
voltage or output load. This means synchronous with monitor .) In abbrev, the SMPS or SPS.
Input :
90VAC - 264V AC ( full range)
Output : +50V
0.9A
39.15W
+75V
0.07A
5.25W
+12V
0.76A
9.12W
+ 6.5V
0.6A
3.9 W
Total output power : 62W
Diagram
Block
(2) Circuit Analysis
The block diagram is shown as follow , is divided into 13 portions
Transformer
Input
EMI
filter
2 Bridge
Rectifier
&
Filter
8
1
4 power
Secondary
Rectifier &
Filter
DCV
output
5 Rectifier &
Filter CKT
7 ext sync
Trigger
CKT
3
MOSFET
& snubber ckt
9
Line
PWM
controller
6
Feedback
CKT
10 V-Sync
Detector
CKT
photo coupler
13 control
switch
on/off
12
11 EPS 1
Detector
CKT
1.
2.
3.
4.
5.
6.
EMI filter CKT
Power SW & Rectifier, filter CKT
PWM controller
Power Mosfet & Snubber CKT
Rectifier & Filter CKT
Feedback CKT
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Chapter 2 Circuit Operation Theory
7. Sync. CKT
8. Transformer
9. 10-12: Rectifier & Filter CKT
10. V-sync Detector CKT
11. EPS1 Detector CKT
12. Photo coupler
13. Control switch on/off
1. EMI filter CKT is a necessary circuit for restraining the electromagnetic interference to meet the
standard of FCC and FTZ. This portion of circuit comprised capacitor, Y capacitor, common
mode choke, differential choke, etc.
Power SW and rectifier filter CKT:
Power SW is used for the control of power on and off Rectifier Filter is able to process the input
AC voltage into a DC voltage, This circuit is designed to operate normally form 90V to 264V
AC. This is so called full rage or universal input.
3.
PWM control IC
UC3842 is a current mode of PWM control IC.
Please refer to the attachment A to see the specification. Because the saw wave and feedback
control is separated, it is ideal for the synchronous operation of the SPS of multi-frequency
monitor.
Some PWM IC combines the saw wave and feedback control as one is not good for the
synchronous operation of multi-frequency monitor's SPS circuit.
It happens the on-off transistor (or MOSFET) destroyed during the horizontal frequency is
switching. That's the reason we adopt UC3842 as the control IC.
*
When load changes, the voltage of the primary coil (pin 6-7) of the transformer will be rectified
and filtered by D608, C608, D607, C607. This voltage value will go down while the load getting
heavier and it's voltage will be divided via R616, VR601, R617 then entering pin 2 of C601
(Verror is direct ratio of output load).
This signal is compared with primary current to decide the amplitude of duty cycle.
When output load gets heavier, the time period of power MOSFET turns on will get longer and
vice versa. This principle is used to control the output voltage stablely, As described above,
the current mode CKT has a dual feedback, one is from the variation of output load, the other is
from the variation of primary current, This causes the response to the variation of AC source
voltage, i.e. a good line regulation.
The function of R613, C615 is to generate a oscillation frequency being the clock input of
UC3842, R614, C617, D611, D612 is a soft start circuit to assure a proper ON time as the
monitor turns on to prevent from the MOSFET destroyed by the surge current the principle
is UC3842 won't work while pin 1 of UC3842 is low. Please check attachment A.
2.
Besides, the operating voltage of UC3842 is 16V while start and 10V after start. In this circuit,
the start voltage is provided by R602, R603. The C607, T601 will work after start and the
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Chapter 2 Circuit Operation Theory
auxiliary coil (pin 8-9) of T601 will generate a voltage to be rectified and filtered by C608, D608,
D607, C607 to maintain the operation.
4. Switching FET & Snubber circuit.
Switching FET is mainly used for the operation of on and off.
It is controlled by IC601.We can obtain the result of FET turn on and off.
Snnbber circuit is mainly consisted of C624, R619, D614, D610, R604 and C613.
It's purpose is to restrain the turn off voltage spike of FET. To prevent it from destroying
for Q602.
5. Rectifier and filter CKT comprises D608, C608, D607, C607 to provide the Vcc for IC601.
6. Feed back CKT comprises R616, VR601, R617 is mainly to divide the voltage of primary
auxiliary coil, then enter pin 2 of 3842 and compare with the internal Vref (2.5V) of IC601 to
obtain a stable output voltage.
SYNC. CKT
In order to prevent from the interference on the picture caused by the difference of the oscillation
frequency of SPS and the horizontal scan frequency of monitor, We use SYNC. CKT to unify
these two frequency. This CKT is consisted of C616, ZD603, R612 and detect the synchronous
signal from the monitor FBT core. After the differential of C616, ZD603 clips it's voltage. and
then add this signal to the pin 4 of UC3842 by way of 612 and C615 to get the synchronous.
8.
Transformer is mainly used for transformer and isolation it's principle is the current will pass pin
1-4 of T601 when FET on and energy being output by T601 when FET off.
7.
9. 10-12:This + 43.5V of Rectifier and filter CKT is consisted of D702, C703 and the other groups
of output voltage is using the same principle to do the rectifier and filtering
10. The V-sync is low or full high, then IC602 is not drived.
The V-sync is pulse, then the waveform of Q701 collector is sharp pulse.
11. When the ESP1 is floating, The IC602 is always drived. At the same time there is not power
saving function. When the ESP1 is Ground, then the IC602 drived according to V-sync.
12. The photo coupler adopts TLP721F of Toshiba and main purpose is that the primary and
secondary is isolated.
13. When V-sync is inactive, IC602 is not drived, Q603, Q604, Q605, turn on.Q602 turn off. The
power shut down and the monitor is in off mode .When V-sync is active . IC 602 is drived. Q603,
Q604, Q605 turn off. Q602 turn on and the monitor in normal mode.
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Chapter 2 Circuit Operation Theory
Attachment A
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Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
Symbol
Vi
Vi
Io
Eo
Parameter
Value
Unit
Supply Voltage (low impedance source)
30
V
Supply Voltage (li < 30mA)
self limiting
Ouptut Current
A
±1
Output Energy (capacitive load)
5
μJ
Analog imputs( pins 2,3)
-0.3 to 55
V
Error Amplifier Output Sink Current
10
mA
Ptot Power Dissipation at Tamb ≦ 25℃ (Minidip)
1.25
W
Ptot Power Dissipation at Tamb ≦ 25℃ (SO8)
800
mW
Tstg Storage Temperature Range
-65 to 150
℃
TL
Lead Temperature (soldering 10s)
300
℃
* All voltag ges are with respect to pin 5, all currents are positive into the specified terminal.
PIN CONNECTION (top view)
COMP
1
VFB
I SENSE
3
RT/ CT
4
Minidip/SO8
VREF
7
6
Vi
OUTPUT
5
GROUND
2
8
D95IN332
PIN FUNCTIONS
4
5
6
7
8
3
Function Description
COMP This pin is the Error Amplifier output and is made available for loop compensation.
VFB
This is the inverting input of the Error Amplifier, It is normally connected to the switchingt
power supply output through a resistor divider.
ISENSE Avoltage proportional to inductor current is connected to this input. The PWN uses this
information to terminate the output switch conduction.
RT/CT The oscillator frequency and maximum output duty cycle are programmed by connecting resistor
RT to Vref and cpacitor CT to ground. Operation to 500KHZ is possible.
GROUND This pin is the combined control circuitry and power ground.
OUTPUT This output directly drives the gate of a power MOSFET.Peak currents up to 1A are sourced and
sunk by this pin.
Vcc
This pin is the positive supply of the control IC.
Vref
This is the reference ouptput. It provides charging current for capacitor CTthrough resistor. RT.
NO
1
2
ORDERING NUMBERS
SO8
UC2842BD1; UC3842BD1
UC2843BD1; UC3842BD1
UC2844BD1; UC3842BD1
UC2845BD1; UC3842BD1
Minidip
UC2842BN;UC3842BM
UC2843BN;UC3843BM
UC2844BN;UC3844BM
UC2845BN;UC3845BM
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Chapter 3 Alignment Procedure
Table of Contents
0. Preparation for Alignment............................................................................................................. 2
1. B+ Adjustment (For function test station only) ............................................................................ 2
2. Geometry Adjustment ................................................................................................................... 2
3. Background Adjustment................................................................................................................ 3
4. Foreground Adjustment ................................................................................................................ 3
5. Final Check ................................................................................................................................... 3
6. Focus Adjustment ......................................................................................................................... 4
7. Convergence Adjustment .............................................................................................................. 4
8. Power Saving Function Check ...................................................................................................... 4
9. Geometry Specification for Production Line ................................................................................ 5
10. Eyelet parts.................................................................................................................................. 5
11. Touch-up parts ............................................................................................................................ 7
12. Glue parts .................................................................................................................................... 8
13. Wire Dressing parts..................................................................................................................... 9
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Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
0. Preparation for Alignment
a.
b.
c.
Pre-set all VRs to the center position except R/G/B bias VR101, 102, 103 counterclockwise to
maximum.
Set up unit and keep it warm up at least 15 minutes.
Preset mode
IBM VGA
640X480
31.5KHz/60Hz
IBM VGA
640X400
31.5KHz/70Hz
6448A
640X480
37.5KHz/75Hz
SVGA4
800X600
46.88KHz/75Hz
SVGA3
800X600
48.09KHz/72Hz
SVGA5
800X600
53.6KHz/85Hz
1. B+ Adjustment : (For function test station only)
Enter factory area -- Press "SELECT +" and "ADJUST-" at the same time then turn power
switch on.
b. Press "ADJUST +" and "ADJUST -" at the same time to clear user area.
c. Input mode 31.5KHz (VGA 640x480) with tilt adjustment pattern.
d. Adjust CRT screw to meet tilt and orthogonal spec. ( Tilt < ±1 mm , Orthogonal < ±1.5mm )
a.
2. Geometry Adjustment
Input mode 53.6KHz (SVGA5) with cross hatch pattern.
Press "SELECT +" and "ADJUST -" keys at a same time.
Adjust switching power supply VR601 to make the horizontal B+ to be 50.0 +/- 0.2VDC.
a.
b.
c.
e.
f.
g.
Input the presetting modes and supporting modes with full white pattern.
Set external contrast to maximum and brightness to raster just cut-off position.
Press "SELECT +" or "SELECT -" to select the adjustment for H-size, H-phase, V-size,
V-center, Pincushion or Trapezoid.
h. Press "ADJUST +" or "ADJUST -" to make the geometry can meet item 9 table 2 spec.
i. Press "SELECT +" and "ADJUST -" at the same time to save the adjustment data.
j. Change timing to next mode and repeat step f, g and h.
k. After all modes are adjusted OK, turn power switch off.
2
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
3. Background Adjustment
Enter factory area -- Press "SELECT +" and "ADJUST -" at the same time then turn power
switch on.
b. Input mode 53.6KHz (SVGA5) with raster only pattern.
c. Adjust external brightness key to maximum.
d. Check the bias VRs of VR101, 102, 103 at counterclockwise maximum position.
e. Adjust screen VR of FBT to obtain twilight raster about 0.7 to 1.2 Ft-L.
f. See which gun appears first, then adjust the two bias VRs of the other two non-appearing guns to
achieve the color temperature meet specification x=0.281 +/- 0.005
y=0.311 +/- 0.005
g. Adjust screen VR of FBT again to let the raster about 0.7 to 1.2 Ft-L.
a.
4. Foreground Adjustment
a. Input mode 53.6KHz (SVGA5) with 3-inch block pattern.
b. Check the drive VRs of VR104, 105 at center position.
c. Adjust external brightness key to cut-off and external contrast key to let the light output be 15
Ft-L,
d. Adjust VR103, 104 to let the color temperature meet the specification x=0.281 +/- 0.003
y=0.311 +/- 0.003
e. Adjust external contrast key to let light output be 45±3 Ft-L.
f. Press "SELECT +" and "ADJUST -" to save the adjustment data.
g. Adjust VR301 to let light output be 31±0.5 Ft-L.
h. Turn power switch off.
5. Final Check
a.
Enter final check area -- press "SELECT +" and "ADJUST +" at the same time then turn power
switch on.
b. Input mode 53.6KHz (SVGA5) with full white pattern.
c. Press "SELECT +" and "ADJUST -" keys at a same time.
d. Check the light output is greater than 30Ft.L.
e. Adjust external contrast and brightness keys to minimum, the video and raster should be
disappear.
f. Check the performance of all modes can meet spec.
3
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
6. Focus Adjustment
a. Input mode 53.6KHz (SVGA5) with characters pattern.
b. Press "SELECT +" and "ADJUST -" keys at a same time.
c. Adjust focus VR of FBT to make "A" area focus clear.
A
video
raster
7. Convergence Adjustment
D
B
a. Input mode 53.6KHz (SVGA5) with purple cross hatch pattern.
b. Adjust 4-pole magnetic ring of Yoke to meet specification.
c. Input mode 53.6KHz (SVGA5) with yellow cross hatch pattern.
d. Adjust 6-pole magnetic ring of Yoke to meet specification.
e. Input mode 53.6KHz (SVGA5) with white cross hatch pattern.
f. Re-confirm the mis-convergence can meet spec.
A
C
E
A ≦ 0.2 mm
B,C,D,E ≦ 0.3 mm
8. Power Saving Function Check
a. Input mode 53.6KHz (SVGA5) with full white pattern.
b. Set external contrast and brightness keys to maximum position.
c. Remove H-Sync only, the video and raster should be extinguished. The LED shows amber color
and the power consumption should be less than 60W.
d. Remove V-Sync only, the video and raster should be extinguished. The LED shows amber
color and the power consumption should be less than 5W.
e. Remove both H and V Sync, the power consumption should be less than 5W and LED shows
amber color.
f. Input H-Sync and V-Sync, the video should be exhibited again and LED on (green).
4
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
9. Geometry Specification for Production Line
(Table 2)
SPECIFICATION
1
HORI SIZE
270 ±4 mm
2
VERT SIZE
202 ±4 mm
3
SIDE PIN
≦ 2.0 mm
4
TOP/BOTTOM PIN
≦ 1.0 mm
5
SIDE BARREL
≦ 1.0 mm
6
TOP/BOTTOM BARREL
≦ 1.0 mm
7
TRAPEZOID
≦ 1.0 mm
8
VIDEO OFFSET
≦ 4.0 mm
9
PARALLELGRAM
10
HORI LINEARITY
11
VERT LINEARITY
≦ 5%
≦ 5%
1. Q602 Heat sink
≦ 2.0 mm
10. Eyelet parts
DESCRIPTION
ITEM
5
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
2. T303
M101 CRT socket
4.
3. IC202 Heat sink/ T302
6
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
11. Touch-up parts
The component listed below must touch-up to avoid solder crack.
1. Q310: 3 points
2. D307: 3 points
L302: 2 points
4.
CN601: 3 points
3.
7
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Q602: 3 points
C612: 2 points
7.
M101: 8 points
5.
6.
Chapter 3 Alignment Procedure
12. Glue parts
1. G2 & G4 VR add glue to fix the position of VR
8
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
2. R607 add glue to fix the Heat sink
13. Wire Dressing parts
1. Left side view:
2.
Right side view:
9
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
3. Rear side view:
Left/Bottom degaussing fixed
5.
Right/Bottom degaussing fixed
4.
10
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 4 Trouble Shooting
Table of Contents
1. No output power......................................................................................................................... 2
2. No video..................................................................................................................................... 3
3. No work...................................................................................................................................... 4
4. Unstable vertical display............................................................................................................ 5
5. H-size adjust............................................................................................................................... 6
6. H-linearity error.......................................................................................................................... 7
7. Brightness CKT check ............................................................................................................... 8
1
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 4 Trouble Shooting
1. No output power
No power
Yes
No
Check F601,
D602~D605 ok?
Replace F601,
D602~D605
Yes
Replace IC601,
ZD602, ZD606
No
Check IC601,
ZD602,ZD606
ok?
Yes
No Q602,
Replace
T601
Check Q602,
T601 ok?
Yes
Check D701,
D702, D704,
D705 ok?
No
Replace D701,
D702, D704,
D705
2
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 4 Trouble Shooting
2. No video
No
Repair
Check 12V?
Yes
No
Repair
Check R, G, B
input of M101
Ok?
No
Repair
Check pin 2, 3,
4 of M103 ok?
Yes
Yes
Check IC101
R, G, B inputNo
& output ok?
Repair IC101
Yes
Check cascode
circuit ok?
No
Check Q101,
Q103, Q105,
Q110, Q111, Q112
Yes
Check M101
No
Ok?
Repair M101
3
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 4 Trouble Shooting
3. No work
Feed back
No Power
flowchart
No
Check LED
Ok?
Green
Check G1,
G2, R, G, B
Output ok?
No
Repair IC201
Amber
Check pin 6,
7 of IC201
ok?
Yes
No
Check Q305,
Q306, Q317,D317
Yes
Check BDRV
output ckt ok?
Check HDRV
No
output ckt ok?
Check Q315,
T301
Yes
Check HV is
about 24KV
ok?
No
Check Q310,
D307, C314,
C315, C312, L302,
4
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 4 Trouble Shooting
4. Unstable vertical display
Unstable vertical
display
IC201 pin 24
sawtooth gererator
Fv OSC = 42Hz &
No
Yes
IC202 has
output?
No
Check IC202
& around ckt
Yes
Check DY
Check IC201
& around ckt
5
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 4 Trouble Shooting
5. H-size adjust
H-size error
Yes
IC801 pin 34
PWM output ok?
No
Replace IC801
No
Check Q301 &
around ckt
Yes
Check Q301
base adjust ok?
No
Replace IC201
Yes
Check EWDRV
output ok?
Yes
Check Q307
adjust range ok?
No
Check Q312,
Q307, R307, R308
Yes
Is the voltage
of C316 ok?
No
Check Q302,
Q307, D307
6
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 4 Trouble Shooting
6. H-linearity error
Linearity error
Yes
Picture the
left/right(1) or
(2)
center/side(2)
asymmetery
Yes
Repair L302
Repair IC801
Check SC0,
No
SC1 output
Yes
Check Q322,
Q323, Q314,
Q333 ok?
Yes
Repair
Yes
Check C312,
C311, C356
No
Repair
7
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 4 Trouble Shooting
7. Brightness CKT check
Brightness
control error
Yes
Check IC801
No
PWM output
ok?
Replace IC801
Yes
No
Check T303,
R324, D303
No
Check Blank/
]Hunlock ckt
Is the voltage of
C305 –190V?
Check Q202
base is low?
Yes
Yes
Check Q203
& M101
8
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
Table of Contents
0 Introduction ................................................................................................................................... 2
1 Electrical Characteristics............................................................................................................... 2
1.1 Power Supply ..................................................................................................................... 2
1.2 Signal Interface................................................................................................................... 2
1.3 Scan Range......................................................................................................................... 2
1.4 Video Performance............................................................................................................. 3
1.5 Timings............................................................................................................................... 3
2 Environment & Reliability............................................................................................................ 4
3 CRT Characteristics ...................................................................................................................... 5
4 Front of Screen.............................................................................................................................. 5
4.1 Geometry............................................................................................................................ 5
4.2 Sharpness Crispness ........................................................................................................... 6
4.3 Light Quality ...................................................................................................................... 6
4.4 Image Stability.................................................................................................................... 6
5 User Controls ................................................................................................................................ 6
5.1 Basic ................................................................................................................................... 6
5.2 Advanced............................................................................................................................ 7
6 Mechanical Characteristics ........................................................................................................... 8
6.1 Dimension .......................................................................................................................... 8
6.2 Weight ................................................................................................................................ 8
6.3 Plastic ................................................................................................................................. 8
6.4 Carton ................................................................................................................................. 8
7 Pallet & Shipment ......................................................................................................................... 9
7.1 Dimension .......................................................................................................................... 9
7.2 Shipping Container............................................................................................................. 9
7.3 Air Transport Container ..................................................................................................... 9
8 Certification .................................................................................................................................. 10
8.1 Environment ....................................................................................................................... 10
8.2 PC-Monitor ........................................................................................................................ 10
8.3 Safety.................................................................................................................................. 10
8.4 EMC ................................................................................................................................... 10
8.5 X-Ray Requirement............................................................................................................ 11
8.6 Ergonomics......................................................................................................................... 11
9 Appendix Table............................................................................................................................. 12
Table 1 - DDC Table................................................................................................................ 12
Table 2 – Geometry Fig............................................................................................................ 17
Fig.1 Linearity Measurements ...................................................................................... 17
Fig.2 General Pincushion Measurements ..................................................................... 18
Fig.3 Trapezoid Measurements .................................................................................... 19
Fig.4 Picture Distortion & Phase Measurements ........................................................... 20
1
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
0 Introduction
The subject model is designed for a value line 15” color monitor. It has the following figures :
0.28mm dot pitch CRT, 65MHz video bandwidth, 1024x768 max resolution.
Low radiation MPRII.
1 Electrical Characteristics
Input Current
Spec
Universal input full range
90~264VAC /47~63Hz
√
90 ~ 264VAC
2.0 Arms
√
On
< 75 W max
√
LED : Green
Standby
<5W
√
LED : Amber
Suspend
<5W
√
LED : Amber
<5W
√
LED : Amber
40 Amp peak
√
cold-start
Power consumption
DPMS
110 VAC/50Hz
Leakage Current
264 VAC/50Hz
Pin assignment
Video input
Sync input
Signal Cable
√
w/o damage
√
< 0.1 ohm
Length : 1800 mm
Color : Flint Gray
Condition
Spec
1.2 Signal Interface
< 3.5mA
2. Ground test : 30A, 1sec
√
TTL-Positive/Negative
√
Impedance
50 Ohm on H-sync cable
√
D-Sub
1.5M +/- 20mm
√
Remark
0.7μs<H-sync width<25% of H
period
2μs<V-sync width< 400μs
√
BNC
1.3 Scan Range
KC-003
OK N.A
700mV / 75 Ohm
Color
(in-line test)
√
√
Level / Impedance
Remark
(in-lab test)
5V on Pin 9
Power cord
1. 1500VAC, 1 sec
Hi-Pot
Off
Inrush Current
OK N.A
Voltage
Condition
1.1 Power Supply
Flint Gray
Spec
√
OK N.A
Horizontal
30 ~ 54 KHz
√
Vertical
50~ 120 Hz
√
Remark
2
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
1.4 Video Performance
Condition
Spec
OK N.A
65 MHz
√
1024 x 768
√
10 ns
√
Video Ringing
15% max
√
Sag
5% max
√
Bandwidth -3db
65 MHz
√
DDC1/2B
√
Ver 2 ,Rev 1, Ver 3
√
Dot Rate
Max. Resolution
Rise time/Fall time
DDC Version
EDID
1.5 Timings
see table 1
User mode No.: 10
Fh (KHz) / Fv (Hz)
VGA400
640x400
31.47KHz/70Hz
√
VGA480
640x480
31.47KHz/59.94Hz
√
6448A
640X480
37.5KHz/75Hz
6448B
640X480
43.269KHz/85Hz
SVGA4
800x600
46.88KHz/75Hz
√
UVGA1
1024x768
48.3KHz/60Hz
√
SVGA5
800x600
53.67KHz/85Hz
√
Apple 16”
832x624
49.71KHz/74.533Hz
√
UVGA2
1024x768
56.476KHz/70.069Hz
√
UVGA7
1024x768
60.023KHz/75.029Hz
√
1024x768
60.24KHz/75Hz
√
1024x768
68.68KHz/85Hz
√
VESA-XGA
1280x1024
63.981KHz/60.020Hz
√
WS7
1280x1024
79.98KHz/75Hz
√
WS8
1280x1024
91.15KHz/85Hz
√
VESA1600
1600x1200
93.75KHz/75Hz
√
UVGA8
Super MAC 19
Resolution
Preset
Preset mode No.: 6
Remark
OK N.A
Remark
√
√
3
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
2 Environment & Reliability
Condition
Spec
OK N.A
Remark
Operation Temp./Humidity
+10 ~ +40℃/ 20~90% R.H.
√
Non-condensing
Non- Operation Temp./Humi.
-20~ +60℃/ 10~95% R.H.
√
Non-condensing
Altitude
Operating condition
0~3048m (10,000ft)
√
Without packing
Non-operating condition
0~12,192m (40,000ft)
√
With packing
5 ~ 26.6Hz /0.6g
√
Vibration
1)Sine
Wave Package, Non-Operating
Vibration
26.6 ~ 50Hz /0.016”
50~500Hz/ 2.0g
(10 Minutes/Axis for x, y, z)
Package, Non-Operating 5 ~ 100Hz, 0 dB/Oct.
2
√
0.015g /Hz
2)Random Vibration
100 ~ 200Hz, -6 dB/Oct., ---------- ,
200Hz,
0.0038g2/Hz
20Hz~2000/ 0.0185g2/Hz
Non-package,
√
Non-Operating
Acoustical Noise
Power Line Transient
IEC801-2 standard
Electrostatic Discharge
Package, Non-Operating
Drop (With packing)
13.7kg - 76cm Height
√
1 corner, 3 edges, 6 faces.
Contact:8KV, Air:15KV
√
< 40 dB/A
√
IEC801-4,IEC1000-4-4 Coupling clamp 0 ~ 4KV
IEC1000-4-5 (Surge)
Common:2KV,Differential:1KV
IEC1000-4-12 (100KHz
Common:3KV,Differential:1KV
0.5~8KV tip table no blanking
√
√
√
ringwave)
MTBF Demonstration
MTBF Prediction
CRT Life
90% confidence level
> 60,000 Hrs
√
Excluding the CRT
MIL-217F
> 40,000 Hrs
√
Excluding the CRT
78% degradation
> 10000 Hrs
√
4
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
3 CRT Characteristics
Spec
OK N.A
CRT Vender
PHILIPS
√
Technology
FST
√
Coating
Anti-glass/Anti-static
√
Dot pitch
0.28mm
√
Phosphor
P22
√
Light transmittance
57%
√
Viewable size
> 14”
√
Deflection angle
90 deg
√
Blemishes and scratches
√
see table 2
1 trio missing, as approval sheet
Remark
4.1 Geometry
Northern Hemisphere
H = 0 + 0.05
Magnetic Environment
4 Front of Screen
Southern Hemisphere
Centering
Geometric Distortion
Linearity
√
V = +0.45 + 0.05
H = 0 + 0.05
√
V = -0.45 + 0.05
H = 0 + 0.05
√
V = 0 + 0.05
Hor.
270 + 4 mm
√
Ver.
202 + 4 mm
√
Hor. & Ver.
|A-B|,|C-D|< 4 mm
√
Top/Bottom / Side Pincushion
< 2 mm
√
Top/Bottom / Side Barreling
< 2 mm
√
Hor./Ver. Trapezoid
< 2 mm
√
Tilt
< 1.5 mm
√
Orthogonal
< 2 mm
√
S-curve
Total distortion <1.0mm
√
Max peak distortion <1.5mm
Hor. & Ver.
<5%
√
(Xmax-Xmin)/( Xmax+Xmin)*100
Size
Remark
Equatorial
OK N.A
See table 4
5
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
4.2 Sharpness Crispness
Focus
OK N.A
Reverse character(white
“e,w,m” at cut-off and
background and black
800 x 600 resolution
√
Remark
The distance of watch is 30cm
from eyes to screen
characters)
A < 0.3mm ,B< 0.4mm
√
no visible moire
√
not permitted
√
”
DIN 66234 T2
< 0.1mm
√
”
Condition
Spec
Full white center
x = 0.281 + 0.010
(Brit. cut-off & Cont.
y = 0.311 + 0.010
Mis-convergence
Moire
Over 25Ft-L
Swing
Jitter
4.3 Light Quality
White Balance
OK N.A
√
Remark
@ UVGA5 800x600
53.6KHz/85Hz
< 0.015
X max-X min & Y max-Y
Purity W,R,G,B
max.)
min
√
”
Brightness cut off
x, y (nominal) + 0.015
√
”
Max Brightness with ABL
Full white pattern
28Ft-L min.(Cut-off)
√
”
40Ft-L min.(Cut-off)
√
”
> 70% (center to corner)
√
”
4.4 Image Stability
H/V regulation
Flicker
Ringing
Contrast ratio
Bright./Cont. Max.
0.5 ~ 1.5Ft-L
√
”
Max/Min
5:1
√
”
Raster light O/P
Full white pattern
Brightness Uniformity
3” Block
Max Brightness no ABL
Color Tracking
OK N.A
< 1 mm per side at cut-off
√
No flicker
√
No visible DY Hor. Video ringing
√
Remark
5 User Controls
5.1 Basic
Function
Spec
OK N.A
Power Switch
√
Contrast
√
Brightness
√
H Size
√
H Position
√
V Size
√
V Position
√
Barrel/Pincushion
√
Remark
6
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
√
Parallelogram
√
Trapezoid
√
I-Key
Function
Spec
OK N.A
OSD position
√
Color Gain
√
Corner
√
Pin-balance
√
Tilt
√
Color Temp. C1, C2
Remark
√
9300K, 6500K
√
Manual Degauss
√
Recall
5 languages
Languages
Mis-Convergence adj.
√
√
√
D-sub/BNC switch
Moire adj.
√
5.2 Advanced
7
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
6 Mechanical Characteristics
6.1 Dimension
Spec
Bezel opening
OK N.A
212 x 283 mm
√
Monitor w/o Stand
L x W x H mm
384 x 361 x 331 mm
√
Monitor w Stand
L x W x H mm
384 x 361 x 384.7 mm
√
Carton Box (outside)
L x W x H mm
474 x 440 x 420 mm
√
Tilt : -4.5/+12.5 degree
√
Tilt and Swivel range
Remark
Swivel:- 45/ +45 degrees
6.2 Weight
Spec
Monitor (Net)
12.0
√
Monitor w packaging
13.7
√
Spec
6.3 Plastic
Flammability
ABS
ABS
6.4 Carton
√
√
MPR2 : ABS
TCO : PC + ABS
RE-6625
√
Light Gray
√
Spec
OK N.A
√
Material
A B Flute
√
Compression strength
530 KGF
√
18 KGF/cm2
√
7 Layers
√
Burst Strength
Stacked quantity
MPR2 Model
√
Kraft
Color
Remark
TCO Model
Delta E< 1.5 after 300Hr Xted test
Color
Texture
65 ℃
Delta E< 5 after 300Hr Xted test
PC + ABS
Resin
√
Remark
70 ℃
PC + ABS
UV stability
OK N.A
UL 94-V0
Heat deflection To
(Gross)
OK N.A
Remark
8
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
7 Pallet & Shipment
7.1 Dimension
Transport Type
Pallet A
Pallet B
Pallet C
Length
1422
X
X
Dimension(mm)
Width
880
X
X
Height
120
X
X
Air Transport Pallet
Length
1422
X
X
Dimension(mm)
Width
880
X
X
Height
120
X
X
7.2 Shipping Container
Quantity of products
(sets)
(Every container)
(Every Pallet)
(Every Container)
Pallet A: 30
Pallet A: 10
Pallet B: X
Pallet B:
630
Pallet A: 30
Pallet A: 21
Pallet B: X
Pallet B: X
X
X
X
X
X
X
X
X
Quantity of products
Quantity of Products
Quantity of pallet (sets)
(sets)
(sets)
(Every Container)
(Every container)
(Every Pallet)
300
40'
20'
Without pallet
With pallet
Quantity of pallet (sets)
(sets)
20'
Quantity of Products
Stowing Type
Shipping Pallet
40'
7.3 Air Transport Container
Container Type
Container
3048
* 2286 * 2438
Pallet A:
30
Pallet A: 4
Pallet B:
X
Pallet B: X
120
9
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
8 Certification
8.1 Environment
Condition
Spec
Green design
OK N.A
ACM Doc. 715-C49
√
ISO14000 Requirement
German Standard
√
E-2000
Switzerland
√
NUTEK
Swedish Standard
√
USA Standard
√
Blue Angel
EPA
Remark
√
EN61000-3-2
Harmonics
TCO92/95
√
TCO99
√
Condition
Spec
PC98/99
Microsoft Windows
DPMS
DDC 1/2B
√
Version 3.0
√
Spec
DNSF
IEC950
CSA (Canada)
√
C22.2 No. 950-M89
√
EN60950
√
+A1+A2+A3+A4
√
+A1+A2+A3+A4
√
rd
EN60950
OK N.A
UL 1950 3 edition
UL (USA)
73/23/EEC
√
CB (Nordics)
√
TUV/GS
EN60950
√
EIAJ/JEIDA (Japan)
√
NOM (Mexico)
√
IAA (Korea)
√
Condition
Spec
OK N.A
89/336/EEC
√
FCC (USA)
Class B
√
EN55022
Class B
√
CISPR 22
Class B
√
VCCI (Japan)
Class B
√
CE Mark
Remark
√
CCIB (China)
8.4 EMC
√
External
Condition
Remark
√
VESA
USB
8.3 Safety
OK N.A
8.2 PC-Monitor
Remark
10
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
√
BCIQ (Taiwan)
C-Tick (Australia)
AS3548
√
√
RRL (Korean)
8.5 X-Ray Requirement
Condition
Spec
DHHS (21 CFR)
OK N.A
USA X- Ray Standard
√
√
DNHW
PTB
German X- Ray standard
√
√
MPRII
√
MPRIII
Condition
Spec
ZH1/618
OK N.A
German ergonomic
Remark
√
√
ISO 9241-3 -7 & 8
8.6 Ergonomics
Remark
11
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
9 Appendix Table
Description
ID Manufacturer Name =ACM
(EISA 3 character ID)
ID Product Code = V551
(Vender Assigned code)
ID Serial Number
32 bits serial no.
(use 0 if n/a)
Header
Week of Manufacture (0-53),use 0 if n/a
Year of Manufacture (year - 1990)
EDID version = 1
Revision = 1
Video Input Define
(see Note 1)
Max. H. Image Size (270 mm)
Max. V. Image Size (202 mm)
(gamma*100) - 100
(see Note 3)
DPMS
(see Note 2)
Red Green Bits Rx1Rx0Ry1Ry0Gx1Gx0Gy1Gy0
Blue White Bits Bx1Bx0By1By0Wx1Wx0Wy1Wy0
Red x bit9-2
Red y bit9-2
Green x bit9-2
(see Note 3)
Green y bits9-2
Blue x bit9-2
Blue y bit9-2
White x bit9-2
White y bit9-2
Established Timing I
Established Timing II
Established Timing III
(see Note 4)
#1 Standard Timing Identification
800*600 85Hz
Table 1 - DDC Table
Address
Data
00
00
01
FF
02
FF
03
FF
04
FF
05
FF
06
FF
07
00
08
06
09
09
0A
02
0B
00
0C
*
0D
*
0E
*
0F
*
10
*
11
*
12
01
13
01
14
08
15
1B
16
14
17
*
18
E8
19
*
1A
*
1B
*
1C
*
1D
*
1E
*
1F
*
20
*
21
*
22
*
23
A4
24
48
25
00
26
45
27
59
12
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
Description
#2
#3
#4
#5
#6
#7
Detailed Timing Description # 1
#8
Data
01
01
01
01
01
01
01
01
01
01
01
01
01
01
00
00
00
FE
00
4D
6F
6E
69
74
6F
72
0A
20
00
00
00
FE
00
4D
6F
6E
69
74
6F
72
0A
20
20
Address
28
29
2A
2B
2C
2D
2E
2F
30
31
32
33
34
35
36
37
38
39
3A
3B
3C
3D
3E
3F
40
41
42
43~47
48
49
4A
4B
4C
4D
4E
4F
50
51
52
53
54
55
56
Detailed Timing Description # 2
13
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
Description
Detailed Timing Description # 3
Detailed Timing Description #4
Data
20
20
20
00
00
00
FE
00
4D
6F
6E
69
74
6F
72
0A
20
20
20
20
20
00
00
00
FE
00
4D
6F
6E
69
74
6F
72
0A
20
20
20
20
20
00
*
Address
57
58
59
5A
5B
5C
5D
5E
5F
60
61
62
63
64
65
66
67
68
69
6A
6B
6C
6D
6E
6F
70
71
72
73
74
75
76
77
78
79
7A
7B
7C
7D
7E
7F
Extension Flag
Check sum
14
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
Note 1
Bit
7
6
5
4
3
2
1
0
Description
Analog / Digital Input : Defines usage of the rest if the byte as "analog input" or
digital input". Analog=0, Digital=1 . If input is described as analog, the following
definitions apply to bits 6-0. Digital is as yet undefined in the following but
provisions have been made in anticipation of a common video output standard for
Flat Panel Display (FPD) use.
Bit
7
Bit Description
Analog / Digital Signal Level
Signal Level Standard (6)
Signal Level Standard (5)
Setup
Sync Inputs Supported (3)
Sync Inputs Supported (2)
Sync Inputs Supported (1)
Sync Inputs Supported (0)
4
3:0
5
0
1
0
1
Operation
0.700V/0.300V (1.000V p-p)
0.714V/0.286V (1.000V p-p)
1.000V/0.400V (1.400V p-p)
Reserved; TBD
Bit
Bit 6
0
0
1
1
Signal Level Standard (6:5) : Refer to the following bit definitions. Identified by the
level of reference white volts above blank, followed by the level of the sync tips in
volts below
blank.
6:5
Setup: If set, the display is set to expect a blank-to-black setup or pedestal per the
appropriate signal level standard.
Sync Inputs (See Bit Operation below)
3
Separate Sync
2
Composite Sync (on H Sync line)
1
Sync on Green Video
0
Serration of the V.Sync Pulse is required when composite sync or sync-ongreen video is used
15
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
2
Bit 7
Bit 6
Bit 5
Bit 4:3
Bit
Samsung
7E
CRT Vender Chunghwa
19h
06
1Ah
4E
1Bh
A0
1Ch
57
1Dh
4F
1Eh
97
1Fh
26
20h
10
21h
47
22h
4F
Hitachi
0E
6E
A0
57
48
99
26
10
47
4F
Samsung
FB
BE
A1
55
4B
97
24
10
47
4F
Philips
BB
Orion
E2
Philips
A2
AE
9E
59
4E
99
27
10
47
4F
Orion
07
4E
A0
57
4A
9A
26
10
47
4F
Hitachi
A6
CRT Vender Chunghwa
17h
BC
3
Note
2:0
Stand-by
Suspend
Active off
Display Type
0,0 - Monochrome/gray scale display
0,1 - RGB color display
1,0 - Non-RGB multicolor display (example:RGY)
1,1 - Undefined.
Reserved. Set at 00h until defined.
Note
16
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
Table 2 – Geometry Fig.
Linearity Measurements
X1
X2
X3
X4
X5
X6
X7
X8
X9
X10
X11 ~ X18
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
Y0
Y1
Y2
Y3
Y4
Y7
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
Y9
Y10
Y13
Y12
Y11
+
Xmax - Xmin
------------------Xmax + Xmin
Ymax - Ymin
-------------------
Y8
Y6
Y5
Fig.1
X 100% < 5%
X 100% < 5%
Ymax + Ymin
17
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
Fig.2 General Pincushion Measurements
Amm
a1
P
S
b2
R
a2
Q
Bmm b1
A, B represented as display area width and height
Top/Bottom Pincushion = (a1 or a2)
Side Pincushion = (b1 or b2)
Substituted A by (PS + QR)/2
B by (PQ + RS)/2
18
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
Fig.3 Trapezoid Measurements
2.5
2.5
2.5
2.5
D
A
B
2.5
2.5
2.5
2.5
C
* Each of the 4 corners of picture shall fall within the relevant area (F) illustrated up (hatched)
* ABCD is the picture outlines.
19
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 1 Engineering Specification
Fig.4
Picture Distortion & Phase Measurements
H1
A
a1
orthogoal
D1
V1
b2
C
D
V2
b1
D2
a2
Tilt
B
Peak
H2
Total
| H 1 − H 2]
≤ 0.02
0.5( H 1 + H 2)
| V 1 − V 2]
≤ 0.02
0.5(V 1 + V 2)
| D1 − D 2]
≤ 0.03
0.5( D1 + D 2)
20
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
Table of Contents
1. Defection CKT............................................................................................................................. 2
(1) Circuit Diagram of Defection ............................................................................................. 2
(2) Autosync Deflection Controller--TDA4857....................................................................... 3
(3) X-ray protection & AFC(Auto Frequency Control) ........................................................... 3
(4) H-size control circuit .......................................................................................................... 4
(5) Horizontal output circuit..................................................................................................... 5
(6) H-Linear correction circuit ................................................................................................. 6
(7) Step-up CKT....................................................................................................................... 7
(8) Vertical output .................................................................................................................... 8
2. Video CKT................................................................................................................................... 9
(1) Black Diagram of Video..................................................................................................... 9
(2) MM1375XD Block Diagram.............................................................................................. 9
(3) Preamp CKT ....................................................................................................................... 10
(4) Cascode CKT...................................................................................................................... 11
(5) DC Restore CKT ................................................................................................................ 12
(6) ABL CKT: (Auto Brightness Limit)................................................................................ 13
(7) Brightness, V-blank, change mode blank, spot killer CKT ................................................ 14
ACER V551 MICROCONTROLLER CIRCUIT OPERATION THEORY ................................... 15
1. Introduction .......................................................................................................................... 15
2. Block diagram ...................................................................................................................... 15
3. MCU..................................................................................................................................... 15
4. How to detect mode timing .................................................................................................. 16
(1) Vertical sync frequency measurement .................................................................... 16
(2) Horizontal sync frequency measurement ................................................................ 16
5. What are the valid key functions for user............................................................................. 16
6. How to execute the auto alignment function........................................................................ 16
ACER V551 POWER SUPPLY CIRCUIT OPERATION THEORY............................................. 17
(1) Brief : .................................................................................................................................. 17
(2) Circuit Analysis .................................................................................................................. 17
Attachment A ................................................................................................................................... 20
1
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
1. Defection CKT
(1) Circuit Diagram of Defection
+40V
C235
0.1U
50V
(D)
R269
(OPEN)
BLANK
R203
ZD201 100K
30V
Q210
(OPEN)
R268
(OPEN)
+12V
+6.3V
VR201
(OPEN)
(HVADJ)
D201
1N4148
+12V
R206
10K
R208
R265 137K
(OPEN) (1%)
R247
10K
BDRV
HDRV
Q204
H945
EWDRV
R258 180
V1
R259 180
R205
2.2K
C201
100U
25V
(EL)
10
H-SYNC
R202 1K
CLBL
16 15 14 13 12 11
VCC
CLBL
HSYNC
VSYNC
VOUT1
VOUT2
EWDRV
9
8 7
6
5
R201 1K
DGND HDRY
PGNDBDRV
SCL
SDA
R210 100
VSMOD
SGND
HPLL1HBUF
25 26
R252
56K
C207
C206
4700P 0.22U R212
100V 22K
50V (PE)
(1%)
(D)
4
BSENS
TP4
+40V
R217
R219 120K
47U 23.2K (1%)
25V (1%)
(EL)
+C205
3 2 1
R218
51K
(1%)
BOP
XRAY
HFLB
HFLB
R220
2.7K
R222
27K
1/4W
HREF HCAP HPLL2
HSMOD
FOCUS
27
28
29
30 31 32
HSMOD
R223
39K
R215
2.61K
(1%)
R213
10K
C208
0.1U C209
100V 0.33U
(PE) 100V
(PE)
TP3
AFC
R214
2.1K
(1%)
R211
150K
R209 100
24
HUNLOCK
23
R207
6.8K
25V
(EL)
BIN
IC201
TDA4857
VSMOD
ASCOR
VAGC VREF VCAP
HUNLOCK
SCL
SDA
17 18 19 20 21 22
+C223
100U
C202
1500P
100V
(PE)
+
V-SYNC
R204
10
1/2W
(FS)
R257 1.8K
V2
C210
1000P
100V
(PE)
R253 R254
9.1K
47K
C211
O.01U
100V
(PE)
C212
6800P
100V
(PE)
R255 R256
22K (OPEN)
C213
+(OPEN)
50V
(EL)
D203 D204 D205
1N41481N4148(OPEN)
SC2
SC1
SC0
2
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
(2) Autosync Deflection Controller--TDA4857
2.1 pin 1 is AFC feedback .
2.2 pin XRAY: if V XRAY > threshold (6.25V typical) switches the whole IC into protection mode.
2.3 pin 3,4,5,6,8 for B+ control function block.
2.4 pin 11(EWDRV) is a parabolic waveform used for pincushion correction
2.5 pin 16 generates video claming & blanking pulse.
2.6 pin 18,19 is I2C data.
2.7 pin 21 V-regulation.
2.8 the resistor from pin 28 (HREF) to ground determines the maximum oscillator frequency.
2.9 the resistor from pin 27 (HBUF) to pin 28 defines the frequency range.
2.10 pin 31 H-regulation.
2.11 pin 32 focus.
9
8 7
10
6
161514131211
(3) X-ray protection & AFC(Auto Frequency Control)
(a) AFC in other words is HFLB (Horizontal Flyback) IC201 pin1, its for synchronize the
second stage (horizontal deflection) with first stage (input signal H-sync.).
(b) TDA4858 pin2 sense the voltage separated by R217, R218 and R219 from FBT pin9 40V. The
TDA 4857 pin2 trigger voltage is 6.14V. When the FBT pin9 40V increase to let the R219
voltage drop achieve 6.14V, the TDA4857 will shutdown. In the time H.V.=28.5KV.
VCC DGNDHDRY
CLBL
PGND
BDRV
HSYNC
VSYNC
VOUT1
VOUT2
EWDRV
IC201
TDA4857
5
BIN
TP3
TP4
+40V
4
R217 R218
+C205
47UR219120K 51K
25V23.2K
(1%) (1%)
(EL) (1%)
3 2 1
BOP
HFLB
XRAY
BSENS
HFLB
AFC
R220
2.7K
R222
27K
1/4W
ASCOR
VSMOD
VAGCVREFVCAPSGND
HBUF HREF
HCAPHPLL2
HUNLOCK
SCL
SDA
HPLL1
HSMOD
FOCUS
171819202122
23
24
2526 27
28
29
303132
3
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
(4) H-size control circuit
(a) H-size control voltage 0~5V input from "H-SIZE" net.
(b) Q301 is a buffer to separate prior signal and latter.
(c) R328 and D314 series connect to SC1 is used to compensating H-size by different
horizontal frequency (for VGA). The SC0, SC1 status are as follows:
(d) Horizontal size module merge the side-pin compensation waveform coming from Q312
then through Q307 inverting-amplify the modulating wave to control Q302、Q303
Darlington pair to control H-size.
(e) R307 and R308 separate the voltage B+ then provide the different voltage for different
horizontal frequency to H-size modulation circuit.
SC1
1
0
1
0
Fh
SC0
>=45KHz
1
40K ~ 45K
1
45 ~ 40KHz
0
<35KHz
0
Cs truth table
VM
L303
19.40108.011
+5V
C316
3.3U
50V
(BP)
+12V
Q302
A733
R305
33K
Q303
D669A
R302
(SHORT)
1/2W
(FS)
SC2
D319 (OPEN)
R358 (OPEN)
D314 1N4148
R328
150K
D318 1N4148
R327
100K
SC0
SC1
H-SIZE
D321 1N4148
Q301
H945
D315
1N4148
R334
22K
VR302
(SHORT)
(H-SIZE ADJ)
B+
+C320
1U
50V
(EL)
R308
120K
(1%)
R345
10K
Q307
H945
EWDRV
Q312
H945
R346
8.2K
R301
7.5K
R344
18K
R307
300K
1/4W
+12V
R312
3.3K
4
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
(5) Horizontal output circuit
(a) C321 couple the HDRV wave form from TDA4857 pin7 to Q315 for switching signal
and get the energy by R335 and R332 series, then through the driver transformer T301
couple the driver wave form to horizontal transistor Q310 via R336 at plus duty and via
D312 at minus duty.
(b) While the horizontal transistor Q310 switching a cycle, the energy provided from FBT
T303 pin6 B+ be stored in horizontal deflection yoke and tunning capacitor C314. The
deflection sawtooth current through horizontal deflection yoke was generated during
the Q310 at ON cycle provides the plus part and during Q310 at latter OFF cycle
provides the minus part through the flyback diode D307.
(c) R333 and C318 series is a snubber circuit to inhibit spike.
(d) C324, R329, D313 and D310 is used to compensate the cross-over distortion when the
D307 OFF Q310 ON.
HV
C314
4000P
1.5KV
(PPSH)
+50V
+
C321
10U
50V
(EL)
R337
33
1/4W
C339
0.01U
100V
(PE)
C324
0.22U
100V
(PE)
HDRV
R336
0.82
2W
50V
(EL)
D312
1N5817
Q315
C2235
D311
R376
1N4148 (OPEN)
R329
22
1/4W
(FS)
D313
1N4148
G2
H-DY
20.60047.104
R313 R311
(OPEN) 300
1/2W 1/2W
3
+C319
1U
T301
(19.20079.011)
4
R332 3
47
5
1/4W
R333
1
6
510
1/4W
C318
470P
500V
(D)
FOCUS
1
6
2
Q310
BU2508AF
R335
470
1/2W
1
D323
1N4003
D307
FMP-2FU
B+
R338
L302
(OPEN) (LIN-COIL)
19.50059.001
C313
(OPEN)
J303
1KV
(JUMPER)
(D)
11
2
5
12
10
9
2
1
3
D310
RGP10J
8
C315
6800P
630V
(PPN)
L303
19.40108.011
T303
19.70060.001
5
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
(6) H-Linear correction circuit
(a) L302 is Linear coil for linearity correction and C312 is Cs capacitor for deflection
current S correction.
(b) R318 and C313 series that parallel to L302 pin1-2 for ringing inhibit.
The goal of R311 and D323 series is both dismissing ringing bar and good linearity.
(c) Reference to Cs truth table, Fh>45KHz Cs = C312.And Fh<45KHz,then Cs =
C311 parallel to C312
C314
4000P
1.5KV
(PPSH)
1
H-DY
20.60047.104
2
Q310
BU2508AF
C312
0.3U
400V
(MPS)
2
C324
0.22U
100V
(PE)
1
C356
0.27U
250V
(MPS)
Q333
IRF630
R387
1M
D310
RGP10J
C315
6800P
630V
(PPN)
R329
22
1/4W
(FS)
D313
1N4148
D307
FMP-2FU
J303
(JUMPER)
C339
0.01U
100V
(PE)
6
D323
1N4003
3
C313
(OPEN)
1KV
(D)
L303
19.40108.011
R391
100K
2
5
M301 R330
2P (OPEN)
1W
1
2
4
HLIN
C317
+C323 (OPEN)
(OPEN)
50V
50V
(EL)
(D)
R331
(OPEN)
CS1
C311
0.22U
250V
(MPS)
R339
1M
+6.3V
3
R337
33
1/4W
R336
0.82
2W
L302
(LIN-COIL)
19.50059.001
R338
(OPEN)
Q318
(OPEN)
D312
1N5817
5
1
R313 R311
(OPEN) 300
1/2W 1/2W
C322
(OPEN)
250V
(MPS)
Q314
IRF630
R319
(OPEN)
Q304
(OPEN)
R314
100
R389
100
R318
(OPEN)
CS2
C357
0.01U
100V
(PE)
R315
100K
C310
0.01U
100V
(PE)
R316
(OPEN)
D305
1N4005
D356
1N4005
T301
(19.20079.011)
4
3
T302
(LIN-COIL)
(OPEN)
+12V
D306
(OPEN)
+12V
R383
4.7K
Q322
H945
C325
(OPEN)
100V
(PE)
R384
4.7K
Q323
H945
+12V
R385
(OPEN)
Q324
(OPEN)
SC2
R392
39K
R317
39K
SC0
R320
(OPEN)
SC1
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Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
(7) Step-up CKT
(a) B+drive duty pulse comes from TDA4857 pin 6
(b) Q305, Q306 constructed class B output to drive Q317.
(c) When Q317 turns on, L304 storage energy and D317 is off. when Q317 turns off L304
release energy and D317 turns on to charge C326 to B+
(d) The higher Hor. frequency needs higher B+ so B+Drive duty must vary with frequency.
HV
+50V
1
FOCUS
13
C309
0.01U
500V
(D)
D317
BYM26A
BDRV
C363 R363
220P (SHORT)
500V 1/2W
(D)
33U
200V
(EL)
C364
(OPEN)
500V
(D)
2
5
12
10
9
3
Q306
A733
11
+C326
R347
200
R373 Q317
47 IRF630
D316
1N4148
6
Q305
H945
G2
L304
19.40139.001
+12V
8
T303
19.70060.001
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Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
(8) Vertical output
(a) TDA4866 is a vertical deflection amplifier, pin7 need a higher DC voltage (50V
currently) for deflection current amplify.
(b) TDA4866 pin1,2 is vertical drive input pin from TDA4857 pin12,13.
(c) Pin 4,6 is vertical deflection output pin to drive vertical YOKE.
(d) Pin8 provides the vertical blank signal for vertical retrace line canceling.
+50V
+12V
IC202
TDA4866
VP INB
3 2
OUTA
GNDOUTB
6 5 4
VFB
FEEDB
GUARD
9 8 7
INA
1
R227
1
2W
+
V-DY
R231
180
1W
+
4
C233
2200P
50V
(D)
Q201
H945
CLBL
R237
10K
R232
10
1/2W
R228
1
1W
+100U
C214
47P
50V
(D)
R224
820
C232
(OPEN)
50V
(D)
25V
(EL)
R225
820
C231
(OPEN)
50V
(D)
C218
0.22U
100V R229
(PE)
100
V1
V2
C219
0.22U
250V
(EL)
G1
3
C215
C217
0.01U
50V
(D)
C216
100U
100V
(EL)
R233
100
1/2W
(FS) R250
R238 R236 2.4K
68K 10K
(1%)
V+
R262
3.3K
R263
4.7K
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Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
2. Video CKT
(1) Black Diagram of Video
R
Preamp CKT
MM1375XD
IC101
VIDEO
Cascode CKT
Q101,110
Q103,111
Q105,112
B
CONTRAST
(From uC IC801)
ABL CKT
Q316
Clamp CKT
Q 205
G
B
G1
Brightness CKT: Q203
Change Mode Blanking:Q202
V-blanking CKT: Q201
Spot Killer CKT: Q202
Beam Current
(From FBT)
R
(From PC)
G
DC Restore
CKT
H-clamp
(From IC201)
(2) MM1375XD Block Diagram
The function block below represents one of the threevideo amplifiers in the MM1375XD
along with the contrast, gain adjust and brightness contrals. The Contrast Control is DC-Level
(0 ~ 4 V) operate attenuator which controls the video gains of the three channels (R, G, B)
simultaneously The Gain
Adjust Control, which is also a DC-level operated circuit, provides a 6 dB gain adjustment to
each channel. During the retrace period, the Clamp Comparator will charge or discharge the
clamp capacitor by comparing the external brightness (clamp+) level with the video output DC
level thus that the brightness level is maintained.
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Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
(3) Preamp CKT
(a) AS shown in the block diagram:
The R/G/B signals will generate an enough amplitude of Vpp to show up on the CRT
screen after the amplification of the amplifiers.
(b) The purpose of signal CLAMP is to fix the black level of all R.G.B signals to the same
level after the AC couple. This is the DC Restoration of pre-amplify
(c) To fix Pin 1,19,20 voltage is to stabilize Pin 13,15,18 (R,G,B Output) DC voltage.
It’s purpose is to lower the Temp. of IC and transistors of Casecode CKT.
(d) VR104,105 control R.,G O/P gains
+12V
R106
100
1/2W
R109
120
1/2W
C154
(OPEN)
50V
(D)
R137
56K
+8V
C101
0.1U
50V
(D)
D111
1N4148
+
C130
10U
50V
(EL)
R110
3k
ZD107
8.2V
R138
9.1K
BI
+8V
1
22
B-IN
6
BI
5
4
GI
3
2
RI
+8V
R103
75
D115
1N4148
19
GND
5
C102
0.1U
50V
(D)
18
6
C129
0.01U
50V
(D)
R131
390
17
G OUT
GO
R123
390
16
G CUTOFF
R111
4.7K
7
R CLAMP
15
G DRIVE
8
VCC1
C108
0.01U
50V
(D)
BO
R120
4.7
1/4W
GND
R-IN
R178
33
D116
1N4148
+
VCC2
G CLAMP
C105
0.1U
50V
(D)
C118
47U
25V
(EL)
20
B OUT
4
D114
1N4148
C104
0.1U
50V
(D)
VR105
2K
(B-DRV)
B CUTOFF
3
R102
75
RI
C100
(OPEN)
50V
(D)
21
B CLAMP
G-IN
R177
33
2
1
IC101
MM1375XD
M102
6P
20.60010.106
B DRIVE
R176
R101
D112 33
75
C106
1N4148
0.1U
50V
(D)
GI
+8V
C103
0.1U
D113
50V
1N4148
(D)
14
R OUT
9
CONT
10
BLANK
13
R CUTOFF
11
12
CLAMP
R DRIVE
C109
(OPEN)
50V
(D)
R117
390
RO
R142
1.5k
R112
3K
R108
100
VR104
2K
(R-DRV)
CONTRAST
H-BLANK
C110
0.01U
50V
(D)
CLAMP
D100
1N4148
+C122
10U
50V
(EL)
R100
4.7K
10
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
(4) Cascode CKT
(a) Output stage adopts cascode circuit Its purpose is to amplify the signal which has
been processed by MM1375XD to a enough amplitude of Vpp, then display on the
CRT. The criteria to select a cascode transistor is the smaller the value of Cob and the
bigger the value of Ft is better.This circuit adopts HSD1609. Cob=3.8pF, ft=140MHZ.
(b) Cascode CKT concludes 3 band amplification.
Mean Freq.: capacitance open, inductance short. The gain = Rc /Re
High Freq.: (R gun),peaking coil L104,L105,R115,C113,R119
Over Freq. Compensation: (R gun),C161,R161.
L105
2.7U
DC RESTORE
12V
Q101
R115
1.6K
1/4W
HSD1609
C112
0.1U
(OPEN)
R171
R116
Q102
H945
C161
150p
50V
(D)
R117
390
R118
100
1/2W
C113
82P
50V
(D)
(OPEN)
15UH
D101
1SS83
30
L104
R161
8.2K
R119
33
B O/P
R151
1.2K
3W
+75V
R113
R114
56
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Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
(5) DC Restore CKT
(a) The video signal amplified by the output stage is coupled to CRT by way of AC
coupling. So DC restoration CKT is needed to do the white balance adjustment.
(b) Use VR101 & R145 and ZD104 to get the range of each gun bias ( Max ≒ 27 V).
(c) O/P signal mixes DC and AC voltage. Only AC signal passes C150. DC voltage is
generated by VR101 cross voltage.
R134
+
CASCODE
CRT
51
1/2W
C150
1U
100
(EL)
ZD104
33V
VR101
R145
20K
20K
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Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
(6) ABL CKT: (Auto Brightness Limit)
ABL is a protection circuit. When the anode current goes higher than the setting value
of ABL circuit . ABL will pull down the voltage of contrast to limit the anode current. This
is helpful to protect CRT.
HV
1
FOCUS
13
G2
6
+12V
11
R350
30K
12
2
D320
1N4148
R352
100K
ABL
CONT
C307
4700P
50V
(D)
+C333
R340
330
Q316
A733
1U
50V
(EL)
9
R355
10K
1/4W
R351
6.8K
10
D309
1N4148
5
VR301
20K
(ABLADJ)
3
T303
19.70060.001
8
a) With crosshatch patter, FBT beam current is smaller. It makes the voltage of C333 higher
than Vcontrast Q316, is OFF the Vconstrast is freely controlled.
b) With the full white, FBT beam current rises, the voltage of C333 is down. It makes Q316
ON. Vce of Q316 is fixed
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Confidence and Property
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Chapter 2 Circuit Operation Theory
R244+5V
(OPEN)
(1%)
VR202
(SHORT)
(G1ADJ)
50V
(EL)
D202 R239
(OPEN) 4.02K
(1%)
Q202
H945
R243
14K
(1%)
C221
+0.22U
50V
(EL)
Q203
BF423
BRITE
R245
1.8K
(1%)
R266
(OPEN)
+C220
10U
(7) Brightness, V-blank, change mode blank, spot killer CKT
(a) About the cut off voltage, while the voltage, cathode to G1, over the cut off voltage, the
picture will disappear. If the cut off voltage of the CRT G Gun is set at 120V and the
black level of cathode is 55v, the picture want to show the signals higher the black level
once the G1 voltage is lower than -65V.
(b) As described above, we may using the voltage control G1 as the brightness control.
Generally the G1 control range is about 12~15V if the Raster brightness is from 0 to
1.5ft-L.
(c) Similarly, we may overlap a negative pulse of vertical duration on the G1 voltage to
prevent the vertical retrace line from showing on the picture. This is to keep the voltage
cathode to G1 over the cut off voltage during the period of vertical retrace.
(d) In order to prevent the picture occurred transiently while change mode, pull down the
G1 voltage and let the voltage cathode to G1 over CUT OFF voltage. This will make
the picture blanking
(e) While monitor turned off, the discharge speed of high voltage circuit is slow since there
is no deflection scanning , a spot which will destroy the phosphor of CRT will display on
the CKT. So the SPOT KILLER circuit will generate a negative voltage higher than CUT
OFF to the G1 to cut the beam This is to protect the CRT.
ZD203
(OPEN)
+50V
ZD202
(OPEN)
BLANK
R264 D206
4.7K 1N4148
R240
R241 4.7K
33K
VFB
R233
100
1/2W
(FS)
HUNLOCK
R238
68K
GUARD
R236
10K
G1
R267
1M
1/4W
R242
120K
1/2W
+
C219
0.22U
250V
(EL)
-190V
Q201
H945
CLBL
C233
2200P
50V
(D)
R237
10K
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Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
ACER V551 MICROCONTROLLER CIRCUIT OPERATION THEORY
1. Introduction
The microcontroller of the V551 can discriminate the display mode by detecting the frequency of the
H/V sync signals and the polarity of horizontal sync signal. It provides DC voltages to control the
picture and save the adjusted parameters into the EEPROM by using the control panel.
2. Block diagram
The major parts of V551 microcontroller circuit are MCU, EEPROM. The circuit block
diagram is shown as below,
EEPROM
Searching for
the same saved
mode timing
with the input
signals and
get the data.
Preset mode data,
User saved mode
data.
Control Panel
PC
RS232
auto alignment
program
PWM
output
To deflection
circuit
Checking if the
valid key be pressed
and do key function.
Adjust
- +
Select
- +
Blanking
SCO-SC1
Detecting the
input signals
of H,Vsync &
H-polarity.
Hsync
Vsync
H-polarity
MCU (MTV012)
(UART) External
adjustment function
3. MCU
The MCU - MTV012 is an 87C51 microcontroller with PWM outputs. It manages the following
functions,
(1) To detect mode and output proper SC0 and SC1 to deflection circuit.
(2) To check if there is the same saved mode in the EEPROM and get the data to transfer into DC
voltages by PWM output and RC filter circuits to control the picture, contrast and brightness.
(3) To check if there is the valid key be pressed and do the key function.
(4) To memorize mode timings and any adjustable parameters of the picture into EEPROM.
(5) The inner registers and PWM output of MCU can be controlled by the external PC alignment
program.
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Chapter 2 Circuit Operation Theory
4. How to detect mode timing
Only when the mode timing input is stable, we can adjust the picture by the control panel, and the
major measurement of the mode timing inputs are horizontal and vertical sync.
(1) Vertical sync frequency measurement
We use the base timer, it can generate a count during a fixed time, this fixed time is 12/12MHz and
we call it "Time base", so when the first vertical sync generated, we enable the base timer, and the
next vertical sync generated, we disable the base timer, and we only need to calculate how many
counts are during a vertical sync period.
The formula is
Vertical sync frequency
= FV
= 1 / Vertical sync period
Vertical sync frequency = 1000000 / Counts
==>
= 1 / [ Counts * (Time base)]
(2) Horizontal sync frequency measurement
We use the event counter for calculating how many counts are during a long fixed time, because
the vertical sync period is longer than the horizontal sync period, we can enable the event counter
when the first vertical sync generated and disable the event counter when the next vertical sync
generated, this time, we can get the horizontal sync counts during a vertical sync period.
The formula is
Horizontal sync frequency
= FH
= Horizontal sync counts / Vertical sync period
Horizontal sync frequency
==>
= Horizontal sync Counts / Vertical sync period
5. What are the valid key functions for user
Total 4 keys for V551 control panel, "select +" & "select -" are the selection of controlled function
with LED change, and "adjust +" & "adjust -" are the selected item to increase & decrease volume.
Except the last basic key functions, the user can press "select +" & "adjust -" to recall the factory
preset data. Meanwhile it takes about 20 seconds for keeping no key pressed to store the adjusted
function into the user data.
6. How to execute the auto alignment function
The MCU supports the UART function, it has 2 I/O ports, one is the receiver, the other is the
transmitter, they are connected with an interface to PC and PC can execute alignment program by
RS232 communication to send the formatted data to the MCU for adjusting any adjustable
parameters of the picture and saving the adjusted values into EEPROM. By this way, we can get
the products with the same quality and reduce the manufacturing time.
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Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
ACER V551 POWER SUPPLY CIRCUIT OPERATION THEORY
(1) Brief :
Acer V551 is equipped with a current mode, constant frequency, synchronous, using fly back
switching mode power supply circuit,(The operating frequency won't vary with the change of input
voltage or output load. This means synchronous with monitor .) In abbrev, the SMPS or SPS.
Input :
90VAC - 264V AC ( full range)
Output : +50V
0.9A
39.15W
+75V
0.07A
5.25W
+12V
0.76A
9.12W
+ 6.5V
0.6A
3.9 W
Total output power : 62W
Diagram
Block
(2) Circuit Analysis
The block diagram is shown as follow , is divided into 13 portions
Transformer
Input
EMI
filter
2 Bridge
Rectifier
&
Filter
8
1
4 power
Secondary
Rectifier &
Filter
DCV
output
5 Rectifier &
Filter CKT
7 ext sync
Trigger
CKT
3
MOSFET
& snubber ckt
9
Line
PWM
controller
6
Feedback
CKT
10 V-Sync
Detector
CKT
photo coupler
13 control
switch
on/off
12
11 EPS 1
Detector
CKT
1.
2.
3.
4.
5.
6.
EMI filter CKT
Power SW & Rectifier, filter CKT
PWM controller
Power Mosfet & Snubber CKT
Rectifier & Filter CKT
Feedback CKT
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Chapter 2 Circuit Operation Theory
7. Sync. CKT
8. Transformer
9. 10-12: Rectifier & Filter CKT
10. V-sync Detector CKT
11. EPS1 Detector CKT
12. Photo coupler
13. Control switch on/off
1. EMI filter CKT is a necessary circuit for restraining the electromagnetic interference to meet the
standard of FCC and FTZ. This portion of circuit comprised capacitor, Y capacitor, common
mode choke, differential choke, etc.
Power SW and rectifier filter CKT:
Power SW is used for the control of power on and off Rectifier Filter is able to process the input
AC voltage into a DC voltage, This circuit is designed to operate normally form 90V to 264V
AC. This is so called full rage or universal input.
3.
PWM control IC
UC3842 is a current mode of PWM control IC.
Please refer to the attachment A to see the specification. Because the saw wave and feedback
control is separated, it is ideal for the synchronous operation of the SPS of multi-frequency
monitor.
Some PWM IC combines the saw wave and feedback control as one is not good for the
synchronous operation of multi-frequency monitor's SPS circuit.
It happens the on-off transistor (or MOSFET) destroyed during the horizontal frequency is
switching. That's the reason we adopt UC3842 as the control IC.
*
When load changes, the voltage of the primary coil (pin 6-7) of the transformer will be rectified
and filtered by D608, C608, D607, C607. This voltage value will go down while the load getting
heavier and it's voltage will be divided via R616, VR601, R617 then entering pin 2 of C601
(Verror is direct ratio of output load).
This signal is compared with primary current to decide the amplitude of duty cycle.
When output load gets heavier, the time period of power MOSFET turns on will get longer and
vice versa. This principle is used to control the output voltage stablely, As described above,
the current mode CKT has a dual feedback, one is from the variation of output load, the other is
from the variation of primary current, This causes the response to the variation of AC source
voltage, i.e. a good line regulation.
The function of R613, C615 is to generate a oscillation frequency being the clock input of
UC3842, R614, C617, D611, D612 is a soft start circuit to assure a proper ON time as the
monitor turns on to prevent from the MOSFET destroyed by the surge current the principle
is UC3842 won't work while pin 1 of UC3842 is low. Please check attachment A.
2.
Besides, the operating voltage of UC3842 is 16V while start and 10V after start. In this circuit,
the start voltage is provided by R602, R603. The C607, T601 will work after start and the
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Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
auxiliary coil (pin 8-9) of T601 will generate a voltage to be rectified and filtered by C608, D608,
D607, C607 to maintain the operation.
4. Switching FET & Snubber circuit.
Switching FET is mainly used for the operation of on and off.
It is controlled by IC601.We can obtain the result of FET turn on and off.
Snnbber circuit is mainly consisted of C624, R619, D614, D610, R604 and C613.
It's purpose is to restrain the turn off voltage spike of FET. To prevent it from destroying
for Q602.
5. Rectifier and filter CKT comprises D608, C608, D607, C607 to provide the Vcc for IC601.
6. Feed back CKT comprises R616, VR601, R617 is mainly to divide the voltage of primary
auxiliary coil, then enter pin 2 of 3842 and compare with the internal Vref (2.5V) of IC601 to
obtain a stable output voltage.
SYNC. CKT
In order to prevent from the interference on the picture caused by the difference of the oscillation
frequency of SPS and the horizontal scan frequency of monitor, We use SYNC. CKT to unify
these two frequency. This CKT is consisted of C616, ZD603, R612 and detect the synchronous
signal from the monitor FBT core. After the differential of C616, ZD603 clips it's voltage. and
then add this signal to the pin 4 of UC3842 by way of 612 and C615 to get the synchronous.
8.
Transformer is mainly used for transformer and isolation it's principle is the current will pass pin
1-4 of T601 when FET on and energy being output by T601 when FET off.
7.
9. 10-12:This + 43.5V of Rectifier and filter CKT is consisted of D702, C703 and the other groups
of output voltage is using the same principle to do the rectifier and filtering
10. The V-sync is low or full high, then IC602 is not drived.
The V-sync is pulse, then the waveform of Q701 collector is sharp pulse.
11. When the ESP1 is floating, The IC602 is always drived. At the same time there is not power
saving function. When the ESP1 is Ground, then the IC602 drived according to V-sync.
12. The photo coupler adopts TLP721F of Toshiba and main purpose is that the primary and
secondary is isolated.
13. When V-sync is inactive, IC602 is not drived, Q603, Q604, Q605, turn on.Q602 turn off. The
power shut down and the monitor is in off mode .When V-sync is active . IC 602 is drived. Q603,
Q604, Q605 turn off. Q602 turn on and the monitor in normal mode.
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Chapter 2 Circuit Operation Theory
Attachment A
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Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 2 Circuit Operation Theory
Symbol
Vi
Vi
Io
Eo
Parameter
Value
Unit
Supply Voltage (low impedance source)
30
V
Supply Voltage (li < 30mA)
self limiting
Ouptut Current
A
±1
Output Energy (capacitive load)
5
μJ
Analog imputs( pins 2,3)
-0.3 to 55
V
Error Amplifier Output Sink Current
10
mA
Ptot Power Dissipation at Tamb ≦ 25℃ (Minidip)
1.25
W
Ptot Power Dissipation at Tamb ≦ 25℃ (SO8)
800
mW
Tstg Storage Temperature Range
-65 to 150
℃
TL
Lead Temperature (soldering 10s)
300
℃
* All voltag ges are with respect to pin 5, all currents are positive into the specified terminal.
PIN CONNECTION (top view)
COMP
1
VFB
I SENSE
3
RT/ CT
4
Minidip/SO8
VREF
7
6
Vi
OUTPUT
5
GROUND
2
8
D95IN332
PIN FUNCTIONS
4
5
6
7
8
3
Function Description
COMP This pin is the Error Amplifier output and is made available for loop compensation.
VFB
This is the inverting input of the Error Amplifier, It is normally connected to the switchingt
power supply output through a resistor divider.
ISENSE Avoltage proportional to inductor current is connected to this input. The PWN uses this
information to terminate the output switch conduction.
RT/CT The oscillator frequency and maximum output duty cycle are programmed by connecting resistor
RT to Vref and cpacitor CT to ground. Operation to 500KHZ is possible.
GROUND This pin is the combined control circuitry and power ground.
OUTPUT This output directly drives the gate of a power MOSFET.Peak currents up to 1A are sourced and
sunk by this pin.
Vcc
This pin is the positive supply of the control IC.
Vref
This is the reference ouptput. It provides charging current for capacitor CTthrough resistor. RT.
NO
1
2
ORDERING NUMBERS
SO8
UC2842BD1; UC3842BD1
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21
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 4 Trouble Shooting
Table of Contents
1. No output power......................................................................................................................... 2
2. No video..................................................................................................................................... 3
3. No work...................................................................................................................................... 4
4. Unstable vertical display............................................................................................................ 5
5. H-size adjust............................................................................................................................... 6
6. H-linearity error.......................................................................................................................... 7
7. Brightness CKT check ............................................................................................................... 8
1
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 4 Trouble Shooting
1. No output power
No power
Yes
No
Check F601,
D602~D605 ok?
Replace F601,
D602~D605
Yes
Replace IC601,
ZD602, ZD606
No
Check IC601,
ZD602,ZD606
ok?
Yes
No Q602,
Replace
T601
Check Q602,
T601 ok?
Yes
Check D701,
D702, D704,
D705 ok?
No
Replace D701,
D702, D704,
D705
2
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 4 Trouble Shooting
2. No video
No
Repair
Check 12V?
Yes
No
Repair
Check R, G, B
input of M101
Ok?
No
Repair
Check pin 2, 3,
4 of M103 ok?
Yes
Yes
Check IC101
R, G, B inputNo
& output ok?
Repair IC101
Yes
Check cascode
circuit ok?
No
Check Q101,
Q103, Q105,
Q110, Q111, Q112
Yes
Check M101
No
Ok?
Repair M101
3
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 4 Trouble Shooting
3. No work
Feed back
No Power
flowchart
No
Check LED
Ok?
Green
Check G1,
G2, R, G, B
Output ok?
No
Repair IC201
Amber
Check pin 6,
7 of IC201
ok?
Yes
No
Check Q305,
Q306, Q317,D317
Yes
Check BDRV
output ckt ok?
Check HDRV
No
output ckt ok?
Check Q315,
T301
Yes
Check HV is
about 24KV
ok?
No
Check Q310,
D307, C314,
C315, C312, L302,
4
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 4 Trouble Shooting
4. Unstable vertical display
Unstable vertical
display
IC201 pin 24
sawtooth gererator
Fv OSC = 42Hz &
No
Yes
IC202 has
output?
No
Check IC202
& around ckt
Yes
Check DY
Check IC201
& around ckt
5
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 4 Trouble Shooting
5. H-size adjust
H-size error
Yes
IC801 pin 34
PWM output ok?
No
Replace IC801
No
Check Q301 &
around ckt
Yes
Check Q301
base adjust ok?
No
Replace IC201
Yes
Check EWDRV
output ok?
Yes
Check Q307
adjust range ok?
No
Check Q312,
Q307, R307, R308
Yes
Is the voltage
of C316 ok?
No
Check Q302,
Q307, D307
6
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 4 Trouble Shooting
6. H-linearity error
Linearity error
Yes
Picture the
left/right(1) or
(2)
center/side(2)
asymmetery
Yes
Repair L302
Repair IC801
Check SC0,
No
SC1 output
Yes
Check Q322,
Q323, Q314,
Q333 ok?
Yes
Repair
Yes
Check C312,
C311, C356
No
Repair
7
Confidence and Property
Acer V551 (new) CRT Monitor Service Guide
Chapter 4 Trouble Shooting
7. Brightness CKT check
Brightness
control error
Yes
Check IC801
No
PWM output
ok?
Replace IC801
Yes
No
Check T303,
R324, D303
No
Check Blank/
]Hunlock ckt
Is the voltage of
C305 –190V?
Check Q202
base is low?
Yes
Yes
Check Q203
& M101
8
Confidence and Property