Download BenQ G922HDL Service manual

Applicable Country & Regions: Global
Service Manual for BenQ:
LCD G925HDA
(D-SUB + Glossy Chassis
Colors)
P/N: 9H.L2WLA.T8x
Product Service Manual – Level 1~2
Version: 1st
Date:03-17-2010
Notice:
For RO to input specific “Legal Requirement” in specific NS regarding to responsibility and
liability statements.
Please check BenQ’s eSupport web site, http://esupport.benq.com, to ensure that you have the
most recent version of this manual.
First Edition (Mar. 2010)
©
Copyright BenQ Corporation 2010. All Right Reserved.
1
18.5″ LCD Color Monitor
BenQ G925HDA
Content Index
1. About this Manual ................................................................................................................................................... 5
1.1 Important ............................................................................................................................................................ 5
1.2 Trademark .......................................................................................................................................................... 5
2. Introduction ............................................................................................................................................................. 6
2.1 RoHS (2002/95/EC) Requirements – Applied to all countries require RoHS. .................................................... 6
2.2 Safety Warning and Notice ................................................................................................................................. 6
2.3 Compliance Statement ....................................................................................................................................... 7
3. General Description ................................................................................................................................................ 8
4. Related service information................................................................................................................................... 8
5. Product Overview ................................................................................................................................................... 9
5.1 Monitor Specifications ........................................................................................................................................ 9
5.2 Packing ............................................................................................................................................................. 11
Level 1 Cosmetic / Appearance / Alignment Service ............................................................................................ 13
Visual Inspection & Cleaning .................................................................................................................................. 13
Software/Firmware Upgrade Process .................................................................................................................... 13
Level 2 Circuit Board and Standard Parts Replacement ...................................................................................... 27
Product Exploded View .......................................................................................................................................... 27
Six Angles’ View ..................................................................................................................................................... 29
Product Disassembly .............................................................................................................................................. 30
Block Diagram ........................................................................................................................................................ 34
Schematic Diagram ................................................................................................................................................ 36
Troubleshooting ...................................................................................................................................................... 44
PCB LAYOUT ......................................................................................................................................................... 50
Appendix 1 – Screw List / Torque ........................................................................................................................... 57
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18.5″ LCD Color Monitor
BenQ G925HDA
Abbreviations & Acronyms
A
ADC
Analog to Digital Converter
AFC
Automatic Frequency Control: control signal used to tune to the correct frequency
B
BenQ
BenQ Corporation
BTSC
Broadcast Television System Committee
C
CPU
CVBS
Central Process Unit
Composite Video Blanking and Synchronization
D
DLP
Digital Light Processing / Texas Instruments®
DMD
Digital Micro mirror Device
DRAM
DVI
Dynamic RAM
Digital Visual Interface
DVI-D
Digital Visual Interface-digital
DVI-I
Digital Visual Interface-Integrated
E
EEPROM
Electrically Erasable and Programmable Read Only Memory
F
FLASH
FLASH memory
G
G-TXT
Green Teletext
H
HDMI
HP
High Definition Multimedia Interface, digital audio and video interface
Head Phone
I
2
IC
Integrated IC bus
L
LED
LVDS
Light Emitting Diode
Low Voltage Differential Signal, data transmission system for high
M
3
18.5″ LCD Color Monitor
MOSFET
BenQ G925HDA
Metal Oxide Semiconductor Field Effect Transistor
N
NC
NVM
Not Connected
Non Volatile Memory: IC containing TV related data (for example, options)
O
OSD
On Screen Display
P
PC
PCB
Personal Computer
Printed Circuit Board (or PWB)
R
RC
RGB
ROM
Remote Control transmitter
Red, Green and Blue. The primary color signals for TV. By mixing levels of R, G
and B, all colors (Y/C) are
Read Only Memory
S
SDA
SDRAM
SW
2
Data signal on I C bus
Synchronous DRAM
Sub Woofer / Software
T
THD
Total Harmonic Distortion
V
VGA
Video Graphics Array
Y
YPbPr
Y/C
Component video (Y= Luminance, Pb / Pr= Color difference signals B-Y and R-Y,
other amplitudes w.r.t. to YUV)
Video related signals: Y consists of luminance signal, blanking level and sync; C
consists of color signal.
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18.5″ LCD Color Monitor
BenQ G925HDA
1. About this Manual
The purpose of Service Manual is to provide a guide line to engineers to repair different models. The appearance
and capability is introduced in this Service Manual. It is better for repair engineer to have a rough idea of this model
through reading the Service Manual. Please do pay attention to the item part of the disassembly when repair the
machine and also do the protection of panel any time. When repairing the circuit board, please follow the
requirement of RoHS and refer to the circuit diagram and repairing process that attached in the Service Manual.
The method of firmware updated, the way of using the menu and some information that may be used when
repairing are also attached in the Service Manual that provide repair engineer various choice.
1.1 Important
Only trained service personnel who are familiar with this BenQ Product shall perform service or
maintenance to it. Before performing any maintenance or service, the engineer MUST read the “Important
Safety Information”.
1.2 Trademark
5
18.5″ LCD Color Monitor
BenQ G925HDA
2. Introduction
This section contains general service information, please read through carefully. It should be stored for easy
access place.
2.1 RoHS (2002/95/EC) Requirements – Applied to all countries require RoHS.
The RoHS (Restriction of Hazardous Substance in Electrical and Electronic Equipment Directive) is a legal
requirement by EU (European Union) for the global electronics industry which sold in EU and some counties also
require this requirement. Any electrical and electronics products launched in the market after June 2006 should
meet this RoHS requirements. Products launched in the market before June 2006 are not required to compliant
with RoHS parts. If the original parts are not RoHS complaints, the replacement parts can be non ROHS
complaints, but if the original parts are RoHS compliant, the replacement parts MUST be RoHS complaints.
If the product service or maintenance require replacing any parts, please confirming the RoHS requirement before
replace them.
2.2 Safety Warning and Notice
Installation
1. Do not use your monitor under any of the following environmental conditions:
• Extremely high or low temperature, or in direct sunlight
• Dusty places
• Highly humid, exposed to rain, or close to water
• Exposed to vibrations or impacts in places such as cars, buses, trains, and other rail vehicles
• Near heating appliances such as radiators, heaters, fuel stoves, and other heat-generating items (including
audio amplifiers)
• An enclosed place (such as a closet or bookcase) without appropriate ventilation
• An uneven or sloping surface
• Exposed to chemical substances or smoke
2. Do not block vents and openings by clothes or curtains.
3. Carry the monitor carefully.
4. Do not place the monitor face down on the floor or a desk surface directly. Otherwise, scratches on the panel
surface may occur.
5. Do not place heavy loads on the monitor to avoid possible personal injury or damage to the monitor.
6. Ensure that children do not hang or climb onto the monitor.
7. Keep all packing bags out of reach of children.
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18.5″ LCD Color Monitor
BenQ G925HDA
Operation
1. To protect your eyesight, please refer to the user manual to set the optimal screen resolution and the viewing
distance.
2. To reduce eye fatigue, take a break on a regular basis while using the monitor.
Avoid taking either one of the following actions for a long time. Otherwise, burn marks may occur.
• Use the monitor in the aspect ratio of 4:3, 5:4, or 16:10.
• Place a still image (such as an OSD menu, fixed text or image) on the screen.
3. To avoid possible damage to the monitor, do not touch the monitor panel by hand, pen, or any other sharp
objects.
4. Excessively frequent plug and unplug of video connectors (D-sub) may cause damage to the monitor.
5. This monitor is designed mainly for personal use. If you want to use the monitor in a public place or a harsh
environment, contact your nearest BenQ service center for assistance.
6. To avoid possible electric shock, do not dissemble or repair the monitor.
7. If a bad smell or an abnormal sound appears to come from the monitor, contact your nearest BenQ service
center for assistance immediately.
Cleaning
1. Ensure that the power is unplugged before cleaning your monitor
2. Use a monitor cleaner and a soft cloth to clean your monitor.
3. Do not use solvents such as alcohol to clean your monitor.
Power
1. To avoid possible damage to the monitor, do not use it in a region where power supply is unstable.
2. Ensure that the power cord is connected to a grounded power outlet before turning on the monitor.
3. Use only the power cord provided by BenQ.
4. Never use a power cord that appears to be damaged or frayed.
5. To avoid possible danger, observe the total electric load when using the monitor with a (multi-outlet) extension
cord.
6. Always turn off the monitor before unplugging the power cord.
2.3 Compliance Statement
Caution: This Optical Storage Product contains a Laser device. Refer to the product specifications and your local
Laser Safety Compliance Requirements.
7
18.5″ LCD Color Monitor
BenQ G925HDA
3. General Description
This new LCD (Liquid Crystal Display) monitor BenQ G925HDA offers numerous features and functions, for
example:
• TFT display (Thin Film Transistor; active matrix)
• Minimal space requirements thanks to slim casing
• Optimum ergonomic characteristics (totally distortion-free, excellent picture definition and color purity right into
the corners)
• Contrast ratio 20000:1, brightness 250nits
• MAX. resolution (1366x768)
• Presentation of up to 16.7 M colors (in conjunction with an appropriate graphics card)
• Automatic scanning of horizontal frequencies from 30 to 63 KHz and refresh rates (vertical frequencies) from 50
to 76 Hz (absolutely flicker-free)
• Digital screen controller with microprocessor for storing 15 different display modes
• Freely adjustable color alignment for matching the screen colors to the colors of various input and output devices
• Convenient operation via integrated OSD (On-Screen-display) menu
• VESA-DDC compatibility
• Plug & play capability
• Power management for reducing power consumption when the computer is not in use
This operating manual contains important information you require to start up and run your LCD monitor.
This specification defines the requirements for the 18.5″ MICROPROCESSOR based Multi-mode supported high
resolution color LCD monitor. This monitor can be directly connected to general 15-pin VGA connector, also
supports VESA DPMS power management and plug & play function.
Additional information
Due to the nature of liquid crystal display (LCD) technology, the picture resolution is always fixed. For the best
display performance, please set the display resolution to 1366x768 pixels with an aspect ratio of 16:9. This is called
“Native Resolution” or maximal resolution - that is, the clearest picture. Lower resolutions are displayed on a full
screen through an interpolation circuit. Image blurring across pixel boundaries can occur with the interpolated
resolution depending upon the image type and its initial resolution.
4. Related service information
This Service Manual contains general information. There are 2 levels of service:
Level 1: Cosmetic / Appearance / Alignment Service
Level 2: Circuit Board or Standard Parts Replacement
Service Web Site
eSupport URL: http://esupport.benq.com
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18.5″ LCD Color Monitor
BenQ G925HDA
5. Product Overview
5.1 Monitor Specifications
G925HDA
Configuration (D-sub)
Panel Type (TN / VA / IPS)
Panel Size
Display Area
Max. Resolution
Pixel Pitch
Brightness (Typ.)
Panel / Display
Contrast Ratio (Typ.) / DCR (Min.)
Viewing Angle (H/V), CR≧10
Power Supply
1366x768
0.10*RGB(H)mm x 0.30(V)mm
200 nits
600:1
(Panel)
/40000:1
GtG response Time
N/A
NTSC ratio
0.72
Panel maker
LGD
BenQ SenseyeTM Technology
Yes
5 Modes (by hotkey) : Standard / Movie /
Dynamic / Photo / s-RGB
Normal (6500°K) / Reddish (5800°K) /
Bluish (9300°K) / User Mode
Hor. Frequency (KHz)
30~63KHz
Ver. Frequency (Hz)
50Hz~76Hz
Speakers (built-in)
Video Input
110Mhz
N/A
D-sub
Audio line in
No
Earphone Jack
No
Voltage Rating
AC: 100~240V (Built-in)
Power-On Mode
23W
Standby Mode
<1W
9
TYP)
90/50
5ms (Tr+Tf)
Color Temperature Selection
(DCR
Min :20000:1
Response Time
PC
Input/Output
403.4 x 254.6
16.7M (6bit+Hi-FRC)
Video Bandwidth (MHz)
Audio
18.5"W(2 lamps)
Display Colors
BenQ SenseyeTM Preset Modes
Video
TN
18.5″ LCD Color Monitor
BenQ G925HDA
Power Off Mode
Chassis Colors
Carton
<0.5W
Silver Black/Black
Original carton with BE flute
Power LED
Tilt (Up / Down)
Green (ON)/ Amber (Standby)
20° ~ -5°
VESA Wall Mount
100 x 100mm
Kensington Lock
Yes
Physical Dimension (WxHxD)
TBD
Box Dimension (WxHxD)
TBD
Net Weight (Esti.)
TBD
Gross Weight (Esti.)
TBD
Container Loading (40')
2070
Container Loading (20')
990
Mechanical Design
17
Languages
(English
/
Francais
Deutsch / Italiano / Espanol /
Multi-language Support
/
Polish /
Czech / Hungarian / Serbo-croatian /
OSD
Romanian / Netherlands / Russian /
Swedish
/
Protuguese
/
Japanese
/
Chinese / S-Chinese)
Other feature
Vista
Vista Basic
VGA cable, power cord, warranty card,
Accessories
quick start guide, CD manual
Regulation Approvals
Refer to the worksheet "RFQ-Regulatory"
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18.5″ LCD Color Monitor
BenQ G925HDA
5.2 Packing
When packing the monitor into the carton, please follow the pictures as below.
1. Using the EPE bag to pack the monitor without base
2. Using the EPS to pack the monitor
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18.5″ LCD Color Monitor
BenQ G925HDA
3. Putting the user manual and power cord in the position as the picture shows below.
Power cord
User manual
12
18.5″ LCD Color Monitor
BenQ G925HDA
Level 1 Cosmetic / Appearance / Alignment Service
Visual Inspection & Cleaning
• Cleaning. Always unplug your monitor from the wall outlet before cleaning. Clean the LCD monitor surface with a
lint-free, non-abrasive cloth. Avoid using any liquid, aerosol or glass cleaners.
• Slots and openings on the back or top of the cabinet are for ventilation. They must not be blocked or covered.
Your monitor should never be placed near or over a radiator or heat source, or in a built-in installation unless
proper ventilation is provided.
• Never push objects or spill liquid of any kind into this product.
Software/Firmware Upgrade Process
Hardware Requirement:
1) ISP board (715GT034-D for BenQ)
2) Printer cable(x1), VGA cable (x1), 12V DC power source
3) PC or notebook with parallel (printer) port x 1
Software Requirement:
1) PORT95NT.exe
2) Realtek_ISP_Tool 3Bank For BenQ ver4.3.exe
3) TPVDDC.exe
Step 1: Install the “PORT95NT.exe”
1. Double click the icon
to install the “PORT95NT”, and then restart the computer.
Step 2: Writing the ISP data
1. Press the button 1 and connect the ISP board as follow:
1
Connect to PC LPT
12V DC input
Connect to the VGA
port of the monitor
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18.5″ LCD Color Monitor
BenQ G925HDA
2. Open the software “Realtek_ISP_Tool 3Bank For BenQ ver4.3.exe”, and then click “RTD 2122 ISP”
Note: The process of the ISP writing takes G2020HD for example.
3. Click “Main1: 64k”, and choose the file “BenQ G2020HD 2545LH _SEC.H00”
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18.5″ LCD Color Monitor
BenQ G925HDA
4. Click “Open”, it will show the below picture
5. Click “Main2: 64~128K”, and choose the file “BenQ G2020HD 2545LH _SEC.H01”
6. Click “128~160”, and choose the file “BenQ G2020HD 2545LH _SEC_EXTEND.hex”
15
18.5″ LCD Color Monitor
7. Click
BenQ G925HDA
, if it is successful it will show the below pictures:
16
18.5″ LCD Color Monitor
BenQ G925HDA
Adjustment / Alignment Procedure
The Control Panel
1. “AUTO”: Adjust vertical position, phase, horizontal position and pixel clock automatically.
2. “MENU” key: Activate OSD main menu and return to the previous menu or exit OSD.
3. ◄ /Mode key: For Left/Decrease adjustment. The key is the hot key for Mode.
4. ► /Contrast/Brightness key: For Right/Increase adjustment. The key is the hot key for Brightness and Contrast.
5. “ENTER” key: Enter sub menus and select items. For models with DVI inputs, this key is also the hot key for
Input.
6. “Power”: Turn the power on or off.
OSD = On Screen Display.
The hot keys will display a graduated scale for adjusting the value of that setting, and will only operate while the
OSD menu is not currently displaying. Hot key displays will disappear after a few seconds of no key activity.
Hot Key Mode
The monitor keys perform as hot keys to provide direct access to particular functions whenever the menu isn't
currently displaying on-screen.
Brightness and Contrast hot keys
Press the ► key to display the Brightness and Contrast indicators. Further press the the ◄or ► keys, then the
ENTER key to select Brightness or Contrast. The ► key will increase the level, while the ◄ key will decrease the
level.
To exit, press the MENU key.
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18.5″ LCD Color Monitor
BenQ G925HDA
Mode Hot Key
Press the ◄ key continually to switch between the 6 modes for the main window, including Standard, Movie,
Dynamics, Photo, and sRGB. The setting will take effect immediately.
Input Hot Key
Press the ENTER key to toggle between different PC video signal inputs that may be connected to your monitor.
The setting will take effect immediately.
Main Menu Mode
You can use the OSD (On Screen Display) menu to adjust all the settings on your monitor.
Press the MENU key to display the following main OSD menu.
There are five main OSD menus:
1. Display
2. Picture
3. Picture Advanced
4. System
Use ◄ (left) or ► (right) keys to highlight a menu item, and press the ENTER key to enter the Menu item settings.
The OSD menu languages may differ from the product supplied to your region.
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18.5″ LCD Color Monitor
BenQ G925HDA
Display Menu
1. Press the MENU key to display the main menu.
2. Press ◄ or ► keys to select DISPLAY and then press the ENTER key to enter the menu.
3. Press ◄ or ► keys to move the highlight to a menu item and then press the ENTER key to select that item.
4. Press ◄ or ► keys to make adjustments or selections.
5. To return to the previous menu, press the MENU key.
Item
Auto
Adjustment
Function
Operation
Optimizes and adjusts the screen settings automatically for you.
Press the ENTER
The AUTO key is a ‘hot key’ for this function.
key to select this
When you connect a digital video output using a digital (DVI)
option and make
cable to your monitor, the AUTO key and the Auto
adjustment.
Range
Adjustment function will be disabled.
H. Position
Adjusts the horizontal position of the screen image.
V. Position
Adjusts the vertical position of the screen image.
Pixel Clock
Adjusts the pixel clock frequency timing to synchronize with the
analog input video signal. Not applicable to a digital input signal.
Phase
Adjusts the pixel clock phase timing to synchronize with the
analog input video signal. Not applicable to a digital input signal.
Picture Menu
19
0 to 100
Press ◄ or ►
keys to adjust the
value.
0 to 100
0 to 100
0 to 63
18.5″ LCD Color Monitor
BenQ G925HDA
1. Press the MENU key to display the main menu.
2. Press ◄ or ► keys to select PICTURE and then press the ENTER key to enter the menu.
3. Press ◄ or ► keys to move the highlight to a menu item and then press the ENTER key to select that item.
4. Press ◄ or ► keys to make adjustments or selections.
5. To return to the previous menu, press the MENU button.
Item
Brightness
Contrast
Sharpness
Function
Adjusts the balance between light and
dark shades.
Operation
Press the ► key to increase the brightness
and press the ◄ key to decrease the
Press the ►key to increase the contrast and
between darkness and lightness.
press the ◄ key to decrease the contrast.
edges of the subjects in the image.
0 to 100
brightness.
Adjusts the degree of difference
Adjusts the clarity and visibility of the
Range
0 to 100
Press the ► key to improve the crispness of
the display and press the ◄ key to have
1 to 5
softness effect on the display.
Color - Press ENTER to enter the Color menu.
Allows video and still photographs to
Normal
be viewed with natural coloring. This is
the factory default color.
Applies a cool tint to the image and is
Bluish
factory pre-set to the PC industry
Press ◄ or ► keys to select this option.
standard white color.
Applies a warm tint to the image and is
Reddish
factory pre-set to the news print
standard white color.
Tailors the image color tint. The blend
of the Red, Green and Blue primary
colors can be altered to change the
• Red
color tint of the image.
Decreasing one or more of the colors
Press ◄ or ► keys and the ENTER key to
will reduce their respective influence
select Red, Green, or Blue. Then use Press
on the color tint of the image. (e.g. if
◄ or ► keys to make the color adjustments.
you reduce the Blue level the image
User Mode
(0 to 100)
• Green
(0 to 100)
• Blue
(0 to 100)
will gradually take on a yellowish tint.
If you reduce Green, the image will
become a magenta tint.)
Hue: Adjustment the degree of how
we perceive colors
Saturation: Adjust the purity degree of
colors.
Press ◄ or ► keys to adjust the settings.
0 to 100
Press ◄ or ► keys to adjust the settings.
0 to 100
The above options for Hue and Saturation are available only if the signal source is
Component Video or HDMI.
20
18.5″ LCD Color Monitor
BenQ G925HDA
Reset
Resets the User Mode custom color
Color
settings to the factory defaults.
YES
Press ◄ or ► keys to adjust the settings.
NO
Press MENU to leave the Color menu.
Dynamic
Contrast
(available
when the
Picture
Mode is set
to Photo,
Dynamics,
The function is to automatically detect
the distribution of an input visual
signal, and then to create the optimal
Press the ENTER key to select this option.
contrast. The higher the level, the
Press ◄ or ► keys to change the settings.
0 to 5
more detailed picture possible will be
displayed.
or Movie)
Picture Advanced Menu
1. Press the MENU key to display the main menu.
2. Press ◄ or ► keys to select PICTURE ADVANCED and then press the ENTER key to enter the menu.
3. Press ◄ or ► keys to move the highlight to a menu item and then press the ENTER key to select that item.
4. Press ◄ or ► keys to make adjustments or selections.
5. To return to the previous menu, press the MENU button.
Item
Function
Operation
Range
Selects a picture mode that best suits the type
of images shown on the screen.
Standard
• Standard - for basic PC application.
• Movie - for viewing videos.
Picture Mode
• Dynamics - for viewing landscape-specific
videos and playing games.
Press ◄ or ► keys to
change the settings.
Movie
Dynamics
Photo
sRGB
• Photo - for viewing still images.
• sRGB - for better color matching
representation with the peripheral
devices, such as printers, DSCs, etc.
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18.5″ LCD Color Monitor
BenQ G925HDA
Senseye Demo
Displays the preview of screen images under
(available when
the selected mode from Picture Mode. The
the Picture Mode
screen will be divided into two windows; the left
is set to Photo,
window demonstrates images of Standard
Dynamics, or
mode, while the right window presents the
Movie)
images under the specified mode.
Press ◄ or ► keys to
ON
change the settings.
OFF
• Full - Scales the input image to fill the screen.
Press ◄ or ► keys to
• Full
Ideal for 16:9 aspect images.
change the settings.
• Aspect
This feature is provided to allow aspect ratio’s
other than 16:9 to be displayed without
geometric distortion.
Display Mode
• Aspect - The input image is displayed without
geometric distortion filling as much of the
display as possible.
System menu
1. Press the MENU key to display the main menu.
2. Press ◄ or ► keys to select SYSTEM and then press the ENTER key to enter the menu.
3. Press ◄ or ► keys to move the highlight to a menu item and then press the ENTER key to select that item.
4. Press ◄ or ► keys to make adjustments or selections.
5. To return to the previous menu, press the MENU button.
Item
Function
Use this to change the input to that
Input
appropriate to your video cable
connection type.
Operation
Press ◄ or ► keys to change the
setting.
OSD Settings - Press ENTER to enter the OSD Settings menu.
22
Range
D-sub (VGA)
18.5″ LCD Color Monitor
BenQ G925HDA
• English
• French
• German
• Italian
• Spanish
Press ◄ or ► keys to change the
settings.
Language
Sets the OSD menu Language.
The language options
displayed on your OSD may differ
from those shown on the right,
depending on the product supplied
in your region.
• Polish
• Czech
• Hungarian
• Serbo-Croatian
• Romanian
• Dutch
• Russian
• Swedish
• Portuguese
• Japanese
• Traditional
Chinese
• Simplified
Chinese
H. Position
V. Position
Display Time
Adjusts the horizontal position of
0 to 100
the OSD menu.
Adjusts the vertical position of the
Press ◄ or ► keys to change the
OSD menu.
settings.
0 to 100
5 / 10 / 15 / 20 /
Adjusts the display the OSD menu.
25 / 30 sec
Press ◄ or ► keys to change the
settings.
To unlock the OSD controls
when the OSD is preset to be
OSD Lock
Prevents all the monitor settings
locked, press and hold the
from being accidentally changed.
"MENU" key for 15 seconds to
YES
When this function is activated, the
enter the "OSD Lock" option and
NO
OSD controls and hotkey
make changes.
operations will be disabled.
Alternatively, you may use ◄ or ►
keys to select "NO" in the "OSD
Lock" submenu from the "OSD
Settings" menu, and all OSD
controls will be accessible.
Press MENU to leave the OSD Settings menu.
DDC/CI*
Allows the monitor settings to be
Press the ENTER key to select
ON
set through the software on the PC.
this option. Press ◄ or ► keys to
OFF
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18.5″ LCD Color Monitor
BenQ G925HDA
change the settings.
Information
Displays the current monitor
Press the ENTER key to select
property settings.
this option.
Resets all mode, color and
Reset All
geometry settings to the factory
default values.
Press ◄ or ► keys to change the
YES
settings.
NO
*DDC/CI, short for Display Data Channel/Command Interface, which was developed by Video Electronics
Standards Association (VESA). DDC/CI capability allows monitor controls to be sent via the software for remote
diagnostics.
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18.5″ LCD Color Monitor
BenQ G925HDA
Display Timing Table
Hor.
Ver.
Frequency
Frequency
(kHz)
(Hz)
640 x 350
31.47
70.09
25.18
VGA
640 x 480
31.47
59.94
25.175
VGA
640 x 480
37.50
75.00
31.500
VGA
720 x 400
31.47
70.08
28.321
VGA
800 x 600
37.88
60.32
40.000
VESA
800 x 600
46.88
75.00
49.500
VESA
832 x 624
49.72
74.55
57.283
MAC
1024 x 768
48.36
60.00
65.000
VESA
1024 x 768
60.02
75.03
78.750
VESA
1024 x 768
68.68
85.00
94.500
VESA
1152 x 720
44.86
60.00
66.750
CVT 0.83MA, DVT 16:10
1152 x 870
68.68
75.06
100.000
MAC
1152 x 900
61.80
65.96
92.978
SUN
1280 x 768
47.396
60.0
68.25
CVT 0.98M9-R
1280x800
49.702
59.81
83.5
CVT-8
1280x800
62.8
75
106.5
1280x720
45.00
59.94
74.25
1280x720
44.77
59.86
74.5
1280x720
56.46
74.78
95.75
1280 x 960
60.00
60.00
108.000
VESA
1280 x 1024
63.98
60.02
108.000
VESA
1280 x 1024
79.98
75.02
135.000
VESA
1280 x 1024
91.15
85.02
157.500
VESA
1360x768
47.7
60.01
85.5
VESA
1366x768
47.76
59.85
85.5
1440 x 900
55.94
59.89
106.500
1440x900-R
55.94
59.89
88.75
1440 x 900
70.6
75
136.75
Pixel Format
Pixel Clock
(MHz)
Source
CVT 1.30MA
• Image disruption may occur as a result of signal frequency differences from graphic cards which do not
correspond with the usual standard. This is not, however, an error. You may improve this situation by altering an
automatic setting or by manually changing the phase setting and the pixel frequency from the “DISPLAY” menu.
• To extend the service life of the product, we recommend that you use your computer's power management
function.
25
18.5″ LCD Color Monitor
BenQ G925HDA
Factory OSD Menu
Turn off the monitor, keep pressing the “MENU” buttons, and turn on the monitor, then when we press the MENU
button, the factory OSD will be at the left top of the panel as below (takes E2220HD for example):
BenQ Service Page
1. Trigger method: press “Menu” key and Power on.
2. Press the menu key will display the service page
3. Press the menu key will close the service page.
4. Power off will quit the service mode
5. At the service mode, the key function is same as normal OSD define.
6. The timer can only reset at the service mode by “Timer Reset” (Timer Reset moves to SI factory Area). And
need to have a warning message to double confirm the reset function. The timer should record up to 99999
hours and will be reset once launch.
7. Add two selected items for DVI HDCP at Service menu
HDMI HPD: To enable the hot plug pin detection. (HDMI port default: On)
DVI HDCP: To disable the hot plug pin detection. (DVI port default: on)
8. Add BenQ logo on/off item, the default is “on”
9. Add the auto power on item, the default is “off ”
10. Add the timer reset warning message, when select the timer reset item, then the warning message will display
and need to confirm it again and the default is “No”.
11. Panel type define need to have the panel version.
12. F/W version need to define the dual or analog model.
26
18.5″ LCD Color Monitor
BenQ G925HDA
Level 2 Circuit Board and Standard Parts Replacement
Product Exploded View
Note: The parts information listed below are for reference only, and are subject to change without notice. Please
go to http://cs.tpv.com.cn/hello1.asp for the latest information.
Item
Part NO.
Description
QTY
Unit
1
Q34G0543ADP 3B0100
BEZEL(L185W-9benq)
1
PCS
2
Q33G0288
LENS
1
PCS
3
Q33G0287ADP 1L0100
KEY PAD
1
PCS
4
Q15G0405801
MAINFRAME
1
PCS
5
Q34G0544ADP EB0130
REAR COVER18.5"
1
PCS
6
Q33G0289ADPA1L0100
LOGO COVER
1
PCS
7
Q34G0545ADP 1B0100
Stand-Front
1
PCS
8
Q37G0125011
hinge
1
PCS
9
Q34G0546ADP 1B0130
Stand-Back
1
PCS
10
A33G0251ADP 2L0100
CABLE CLIP
1
PCS
11
Q34G0547ADP 1B0101
BASE
1
PCS
12
Q12G6082
FOOT PAD
1
PCS
13
Q23G3178881 1A
LOGO for black
1
PCS
14
P15G8299
BKT-VESA
1
PCS
15
750GLU185X1854N000
PANEL M185XW01 V80D SH AUO
1
PCS
16
715G3327M02001004S
MAIN BOARD
1
PCS
2 1C0100
1
3
27
18.5″ LCD Color Monitor
18
715G2852
3
19
715G3367
2
4
BenQ G925HDA
POWER BOARD
1
PCS
KEY BOARD
1
PCS
Description
QTY
Unit
SCREW
Item
Part NO.
S1
0M1G 130
6120
PANEL& MAINFRAME
3
PCS
S2
0M1G1030
6120
PCB & MAINFRAME
4
PCS
S3
AQ1G1740 12120
HINGE & STAND
2
PCS
S4
0M1G1740
HINGE & STAND
1
PCS
S5
AM1G1740 12 47 CR3
HINGE & STAND&MAINFRAME
2
PCS
Part NO.
Description
QTY.
Unit
Q44G8015101
EPS
1
PCS
Q44G8015201
EPS
1
PCS
Q44G8015624 1A
CARTON
1
PCS
8 47 CR3
ART.
28
18.5″ LCD Color Monitor
BenQ G925HDA
Six Angles’ View
29
18.5″ LCD Color Monitor
BenQ G925HDA
Product Disassembly
1) Remove the base
Place the monitor face down on a smooth surface. Be careful to avoid scratch and injury during the process of
uninstall. And then remove the base.
2)
Remove the stand
Be careful to avoid scratch and injury during the process of uninstall. And then remove the screws in red to remove
the base.
30
18.5″ LCD Color Monitor
3)
BenQ G925HDA
Remove the rear cover
Remove the rear cover as follow:
31
18.5″ LCD Color Monitor
4)
BenQ G925HDA
Remove the key board from the bezel.
5)
Remove the main frame from the panel.
32
18.5″ LCD Color Monitor
BenQ G925HDA
6) Remove the boards from the main frame.
7) The panel
33
18.5″ LCD Color Monitor
BenQ G925HDA
Block Diagram
Main Board
Crystal
24MHZ
Panel Interface
(CN601)
(X401)
MCU RTD2122L-LF
Scalar IC RTD2035L
(U401)
(U501)
DDC1_SCL
DDC1_SDA
H sync
V sync
RGB
Key Control Interface
D-Sub Connector
(CN202)
(CN301)
34
18.5″ LCD Color Monitor
BenQ G925HDA
Power Board
AC input
EMI filter
Bridge Rectifier
and Filter
Rectifier
diodes
Transformer
Start Circuit: R904, R932, R933
CN902
Feedback
Circuit
PWM
Control IC
5V
12V
ON/OFF
Output
Circuit
Lamp
MOSFET
Transformer
Feedback
Circuit
PWM
ON/OFF
Control
Control IC
（IC801）
Over Voltage
35
DIM
18.5″ LCD Color Monitor
BenQ G925HDA
Schematic Diagram
Main Board
CN201
1
2
3
4
5
6
7
8
9
CMVCC
CMVCC
CMVCC
BKLT-VBRI
BKLT-EN
C_PANEL_INDEX
Volume#
Mute
FB202
MVCC
DIM#
{4}
PANEL_ID#
Volume#
Mute
{4}
{4}
{4}
NC
CMVCC
FB201
3
VIN
VOUT
2
VSS
120
CONN
VCC3
U201
C202
+
C204
AP1117E33LA
C205
C203
100UF25V
+
1
100UF25V
0.1uF/16V
0.1uF/16V
Panel ID(3.3V PWM)
Back light
Dimming(3.3V PWM)
VCC3
* BKLT-EN High ON(3.3V)
BKLT-EN
R202
4K7 1/16W
R201
200 1 / 1 6 W
C206
0.1uF/16V
Q202
PMBS3904
INV_ON#
{4}
VCC3
R207
120R 1/16W
R208
120R 1/16W
Q204
PMBS3906
R210
CN202
1
2
3
4
5
6
KEY 0
KEY 1
POWER_KEY #
LED_G
LED_R
10K 1/16W
C201
ZD201
NC
{4}
10K 1/16W
LED_G#
{4}
Q205
PMBS3906
LED_G
C210
0.1uF/16V
0.1uF/16V
1
ZD203
NC
C209
0.1uF/16V
1
NC
2
2
2
ZD202
LED_R#
LED_R
R213
1
CONN
KEY 0
{4}
KEY 1
{4}
POWER_KEY # {4}
Near to Connect
OEM MODEL BenQ G922HDAL
Size
B
絬 隔 瓜 絪 腹
G2498-2A-AO-X-16-091216
TPV MODEL
T89ARPMCFWBQNN
Rev
1.0
Key Component
3.POWER
PCB NAME
715G2498-2A-AO
称爹
<称爹>
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Date
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Co . ,
Ltd. )
Wednesday , December 16, 2009
Sheet
3
of
7
18.5″ LCD Color Monitor
DSUB_V
BenQ G925HDA
{4}
R301 100R 1/16W
R303 100R 1/16W
RTD_H
RTD_V
{5}
{5}
2
2
ZD303
ZD302
R304
2.2K 1 / 1 6 W
R305
2.2K 1 / 1 6 W
RLZ5.6B
RLZ5.6B
C302 C303
FB302
22pF
VGA_B+
1
RTD_B+
2
BEAD
1
1
R306 100R 1/16W C304
22pF
RTD_B+
{5}
RTD_B-
{5}
RTD_G+
{5}
RTD_G-
{5}
RTD_R+
{5}
RTD_R-
{5}
CN301
16
DSUB_H
R320 100R 1/10W 5% 13
12
2
11
C413
0.1uF/16V
2
VGA_B-
RTD_B-
C414
0.1uF/16V
0.047uF
RLZ5.6B
FB301
R309 100R 1/16W C307
RLZ5.6B
VGA_G+
1
2
RTD_G+
BEAD
DB15
R310
C308
5pF/50V
RLZ5.6B
75R 1/16W
1
RLZ5.6B
0.047uF
R312 100R 1/16W C309
VGA_G-
RTD_G0.047uF
FB303
VGA_R+
1
R313 100R 1/16W C301
RTD_R+
2
R314
VGA_B+
VGA_R+
VGA_G+
BEAD
C310
5pF/50V
75R 1/16W
0.047uF
R315 100R 1/16W C311
VGA_R-
RTD_R-
C317
3
3
D301
BAV99
D302
BAV99
0.1uF/16V
0.1uF/16V
0.047uF
D303
BAV99
C315
2
2
1
C316
1
3
R316
R317
R318
200R 1/10W 5% 200R 1/10W 5% 200R 1/10W 5%
2
1
VGA_BVGA_B+
VGA_GVGA_G+
VGA_RVGA_R+
R308 100R 1/16W C306
ZD305
ZD307
17
ZD301
R426 22R 1/10W 5%
ZD304
0.047uF
CMVCC
1
2
DDC1_SDA
DSUB_5V
1
R319 100R 1/10W 5% 14
C305
5pF/50V
75R 1/16W
VGA_CON
DSUB_5V
2
DSUB_V
{4}
10
5
9
4
8
3
7
2
6
1
15
DDC1_SCL
1
R428 22R 1/10W 5%
{4}
R307
R311 100R 1/16W
DSUB_CONNECT {4}
0.1uF/16V
OEM MODEL BenQ G922HDAL
Size
B
絬 隔 瓜 絪 腹
G2498-2A-AO-X-16-091216
TPV MODEL
T89ARPMCFWBQNN
Rev
1.0
Key Component
4.INPUT
PCB NAME
715G2498-2A-AO
称爹
<称爹>
T P V ( Top
Date
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Electronics
Co . ,
Wednesday , December 16, 2009
Ltd. )
Sheet
4
of
7
18.5″ LCD Color Monitor
BenQ G925HDA
DSUB_5V CMVCC
CMVCC
D401
C402
D402
BAV70
2
MCU_VCC
BAT54C(NC)
1
NC
C404
MCU_VCC
R405 R406 R407
3
Q401
PMBS3904
U403
C412
R402
1K 1/16W
NC
NC
NC
NC
MCU_VCC_S
1
2
3
4
1uF 10V
R403
3.9K 1 / 1 6 W
U402
AZ431AN-AE1
3
NC VCC
NC WC
NC SCL
VSS SDA
8
7
6
5
R408
R409
R410
WP
IICSCL
IICSDA
NC
NC
NC
NC
R404
10K 1/16W
2
1
MCU_VCC
BAT54C
MCU_VCC
VCC
40
39
38
37
36
35
34
33
P1.0/T2
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
41
4
32
31
30
29
28
27
26
25
24
23
22
21
20
R425
10K 1/16W
DSUB_V1
R427
NC/0R05 1/16W
DSUB_V
R429
0R05 1/16W CRY STAR_OUT
DSUB_CONNECT
R433 100R 1/16W
R434 100R 1/16W
R435 100R 1/16W
POWER_KEY #
KEY 1
KEY 0
NC
NC
NC
NC
P6.7
P6.6/CLKO1
P6.5
P6.4
P6.3/ADC3
P6.2/ADC2
P6.1/ADC1
P6.0/ADC0
42
43
R415
MCU_VCC
VSY NC
NC
NC
LED_G#
LED_R#
ASCL1/P3.0/RXD
ASDA1/P3.1/TXD
P3.2/INT0
P3.3/INT1
P3.4/T0
P3.5/T1
P7.6/CLKO2
P7.7
RTD_SD3/SDI {5}
RTD_SCLK
{5}
C409
NC(22pF/16V)
NC
NC
NC
NC
18
19
9
10
11
12
13
14
RST
4K7 1/16W
5
8
IICSDA
IICSCL
WP
RTD_SD3/SDI
RTD_SCLK
6
7
PANEL_VCC
DDC1_SCL
DDC1_SDA
P5.0/PWM0
P5.1/PWM1
P5.2/PWM2
P5.3/PWM3
P5.4/PWM4
P5.5/PWM5
DSCL2/P5.6
DSDA2/P5.7
VSS
LED_G#
LED_R#
44
45
46
47
48
1
2
3
100R 1/16W
100R 1/16W
1K 1/16W
1K 1/16W
100R 1/16W
100R 1/16W
17
{2}
{2}
DDC1_SCL
DDC1_SDA
U401
XO
XI
{3}
{3}
R420
R422
R423
R424
R430
R432
C405 C406
10UF50V
0.1uF/16V
15
16
Volume#
Mute
PANEL_ID#
DIM#
PPWR_ON#
INV_ON#
R414
4K7 1/16W
Volume#
Mute
PANEL_ID#
DIM#
PPWR_ON#
INV_ON#
1K 1/16W
1K 1/16W
{2}
{2}
{2}
{2}
{6}
{2}
R451 R413
4K7 1/16W
+
R454 R453
R412
4K7 1/16W
R411
4K7 1/16W
MCU_VCC_S
VCC3
DSUB_V
{3}
CRY STAR_OUT {5}
MVCC
DSUB_CONNECT {3}
R431
POWER_KEY # {2}
KEY 1
{2}
KEY 0
{2}
6K8 1/16W
RTD2122L-LF
6K8 1/16W
R416
10K 1/16W
C403
0.1uF/16V
24mhz
X401
1
Closed to X'tal
C401
10pF
R437
R401
R438
3.9K OHM +-1% 1/16W
3.9K OHM +-1% 1/16W
3.9K OHM +-1% 1/16W
MCU_VCC
2
C410
0.1uF/16V
R436
10K 1/16W
R439
6K8 1/16W
C411
10pF
Closed to MCU
OEM MODEL BenQ G922HDAL
Size
B
絬 隔 瓜 絪 腹
G2498-2A-AO-X-16-091216
TPV MODEL
T89ARPMCFWBQNN
Rev
1.0
Key Component
5.MCU/RTD2122
PCB NAME
715G2498-2A-AO
称爹
<称爹>
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Electronics
Co . ,
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Ltd. )
Sheet
5
of
7
BenQ G925HDA
{3}
{3}
{3}
{3}
DGND
37
TXO0+
39
R1.8DVCC
40
38
TXO0-
PGND
SDA
VCCK
{4}
RTD_SCLK
RTD_SD3/SDI
41
42
SCL
DDCSCL/PWM0
DDCSDA/PWM1/IRQ
43
RTD_SCLK
CRYSTAR_OUT
44
46
45
XIN
47
VCLK/RX2P
TMDS_VDD
TXE1-
15
16
17
18
RTD_R+
R1.8DVCC
BJT_B
RTD_GRTD_G+
RTD_RRTD_R+
TXE1+
36
35
34
33
32
RXOC-
31
RXOC+
RXOCRXOC+
30
29
28
RXE0-
27
RXE0+
26
RXE1-
25
RXE1+
TXE224
B+
RXE2-
12
TXE0+
B-
TXE2+
RTD_B+
ADC_GND
TXE3-
11
TXE0-
23
{3} RTD_B+
RTD_B-
TXO3+
AHS
22
{3} RTD_B-
10
RTD2035L
AVS
RXE2+
DGND
TXO3-
RXE3-
9
TXOC+
V7/RXCN
TXE3+
RTD_H
V6/RXCP
PGND
8
TXOC-
21
{3} RTD_H
RTD_V
V5/RX0N
RXE3+
{3} RTD_V
TXO2+
VCCK
7
TXO2-
V4/RX0P
20
6
V3/RX1N
DGND
5
TXO1-
19
DGND
U501
TXO1+
R1.8DVCC
4
V2/RX1P
BJT_B
3
V1/REXT
ADC_VDD
2
0.1uF/16V
0.1uF/16V
0.1uF/16V
R+
C501
C506
RTD_R-
22UF50V
C507
+
R-
1
FB503
120
C505
G-
MMBT2907AK
G+
Q502
14
3.3 2 W
13
R507
RTD_G-
VCC3
R1.8DVCC
Q501
MMBT2907AK
RTD_G+
1.8AVCC
V0/RX2N
48
BJT_B
TMDS_VDD
C503
0.1uF/16V
RTD_SD3/SDI
CRYSTAR_OUT
VCC3
FB502
120
{4}
{4}
18.5″ LCD Color Monitor
LVDS_E0
LVDS_E1
LVDS_E2
LVDS_E3
RXE0RXE0+
RXE1RXE1+
LVDS_E4
LVDS_E5
LVDS_E6
LVDS_E7
LVDS_E8
LVDS_E9
RXE2RXE2+
RXECRXEC+
RXE3RXE3+
LVDS_E[0..9]
R1.8DVCC
OEM MODEL BenQ G920HDAL
Size
B
絬 隔 瓜 絪 腹
G2498-2A-AO-X-16-091216
TPV MODEL
T89ARPMCFWBQNN
Rev
1.0
Key Component
6.RTD2035L
PCB NAME
715G2498-2A-AO
称爹
<称爹>
T P V ( Top
Date
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Electronics
Co . ,
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Ltd. )
Sheet
6
of
7
{6}
18.5″ LCD Color Monitor
BenQ G925HDA
LVDS Panel ( Normal Type )
CN601
RXE0RXE1RXE2RXECRXE3{6}
1
3
5
7
9
11
13
LVDS_E[0..9]
LVDS_E0
LVDS_E1
LVDS_E2
LVDS_E3
RXE0RXE0+
RXE1RXE1+
LVDS_E4
LVDS_E5
LVDS_E6
LVDS_E7
LVDS_E8
LVDS_E9
RXE2RXE2+
RXECRXEC+
RXE3RXE3+
2
4
6
8
10
12
14
RXE0+
RXE1+
RXE2+
RXEC+
RXE3+
PANEL_VCC
CONN
R602
330R 1/8W
R606
NC(R0805)
C602
0.01uF/25V
3D
CMVCC
1
G
R603
NC
R605
4K7 1/16W
AO3401L
R601
C603
10K 1/16W
2
S
PANEL_VCC
0.1uF/16V
R604
PANEL_VCC
Q601
AO3401
2006-11-7 Add pull up 4K7 to MVCC
47K1/16W
{4}
PPWR_ON#
PPWR_ON#
FB601
Q602
PMBS3906
120
+
T P V ( Top
絬 隔 瓜 絪 腹
Key Component
Date
Victory
Electronics
Co . ,
G2498-2A-AO-X-16-091216
7.OUTPUT
Thursday , December 17, 2009
40
Ltd. )
C604
47UF25V
OEM MODEL BenQ G920HDAL
Size
A
TPV MODEL
T89ARPMCFWBQNN
Rev
1.0
PCB NAME
715G2498-2A-AO
称爹
<称爹>
Sheet
7
of
7
18.5″ LCD Color Monitor
BenQ G925HDA
Power Board
R918
100 OHM 1/4W
L904
R920
+
+
100 OHM 1/4W
3
4
9
10
5
7
8
4
R904
10K OHM 1/4W
C907
100uF450V
R932
10K OHM 1/4W
C901
1000pF
C906
1500pF2KV
D907
100KOHM +-5% 2WS
NC
D900
FR107
R906
NC
11
12
6
2
R921NC
C921
+
R939
1K 1/8W
0.001uF
F902
+
NC
C939
NC
R948
NC
POWER X'FMR
NC
Q904
31DQ06FC3
R952
NC
NC
F903
D903
LL4148
!
R961 100 OHM 1/4W
IC901
!
RT
HV
COMPNC
CS VCC
GND OUT
8
7
6
5
R910
10R 1/4W
2
4
1
2
3
4
ZD905
RLZ18B
LD7575A PS
+5V
1.0uH
NC
R962 100 OHM 1/4W
C929
0.001uF
Q901
2SK2645-54MR
R938
+
C940
1000UF25V
R924
ZD921
RLZ13B
ZD922
RLZ5.1B
10K 1/8W
R940
33K 1/10W
R927
3.6K OHM 1% 1/10W
C909
470pF/25V
!
IC902
PC123X2Y FZOF
3
!
R914
0.47 OHM +-5% 2WS
D916
LL4148
R925
1K 1/8W
D915
LL4148
2
R902
4
220 OHM 1/4W
1
R912
0.22UF
680K OHM 1/4W
F905
0 OHM 1/4W
1
R915
100K OHM 1% 1/8W
+
C915
470uF/16V
150R 1/8W
R935 100 OHM 1/4W
1
C908
L903
!
2
3
R907
NC
30mH
+5V1
NC
F904
R947
NC
R923NC
R909
5.1 OHM 1/4W
D901
FR103
C903
22uF/50V
C910
NC
D905
2
C932
ZD923
NC
R922NC
+
1
L905
NC
1
!
Q903
PMBS3904
D906
FCH10U10
R908
R905
NC
C911
0.1uF
L901
0.1uF
R943
470R 1/8W
3
1
C902
1000pF
C930
1
NC
!
R946
150 OHM 2W
C922
470PF50V
ZD902
RLZ13B
C918
680uF/25V
C938
0.22UF
!
+
2
+
!
C904
+
C917
680uF/25V
1
-
BD901
KBP208G
!T901
2
2
+12V
2
1.0uH
2
!
100 OHM 1/4WC912
0.001uF
1
1
R919
R901
R900
!
680K OHM 1/4W
680K OHM 1/4W
C924
0.1uF
C928
0.01uF
C900
3300pF 250V
GND1
GND
!
VAR901
Varistor
1
2
IC903
AZ431AZ-AE1
R942
1K 1/10W 1%
R926
1K 1/10W 1%
R930
2.43K OHM 1% 1/10W
C925
NC
CN902
N.C
HS2
HEAT SINK(D906_Q90G6263-6)
NR901
NTCR
!
!
t
!
C931
0.1uF
HS5
SHIELD(H85G0002-1)
HS3
HEAT SINK(Q901_Q90G6263-6)
3
MUTE
+5V
DIM
ON/OFF
1
2
F901
FUSE
2
VOL
1
2
3
4
5
6
7
8
9
10
1
2
CONN
1
2
1
CN901
SOCKET
87G 501 32 S
OEM MODEL
Size
絬 隔 瓜 絪 腹 G2852-A-4-X-5-081126
TPV MODEL
Rev
Key Component
PCB NAME
T P V ( Top
!
Date
41
Victory
Electronics
Co . ,
1.POWER
Wednesday , Nov ember 26, 2008
Ltd. )
Sheet
715G2852 3 4
1
of
2
称爹
Custom
A
18.5″ LCD Color Monitor
BenQ G925HDA
1
2
C839
1500PF/50V
6
T801
POWER X'FMR
7
F801
R804
100R 1/8W
C802
470PF50V
Q801
PMBS3904
C824
0.1uF
Q802
AM9945N-T1-PF
1
8
S
D
+
D810
NC
Q808
PDTA144WK
2
3
R839
22R 1/8W
Q804
PMBS3906
1
2
3
4
G
D
S
D
G
D
7
R856
15R 1/4W
1
8
R801
1K5 1/10W 1%
C803
30pF/3KV
C838
1500PF/50V
1
2
5
R822
1K 1/8W
R828
10K 1/10W 1%
CONN
CN802
2
D807
LL4148
Q811
PMBS3904
DIM
D801
BAV99
6
3
C825
0.1uF/25V
2
ON/OFF
C807
0.1uF/25V
C819
0.0022uF
CONN
CN801
1
0 OHM 1/4W
Q805
PDTC144WK
C801
30pF/3KV
3
4
+12V
R821
1K 1/8W
R817
10K 1/10W 1%
D805
LL4148
R855
15R 1/4W
3
C823
0.0022uF
1
R814
1K5 1/10W 1%
D811
NC
2
R850
22R 1/8W
3
Q812
PMBS3906
1
D802
BAV99
R827
1K 1/10W 1%
Q806
PMBS3904
R853
68K 1/10W
C835
NC
D817
LL4148
R841
68K OHM 1% 1/10W
R851
6K8 1/10W
C842
0.01uF
R802
8.2K 1/10W 1%
R829
22R 1/8W
R825
22R 1/8W
R837
47K 1/8W
R830
NC
C822
1uF/25V
R832
10K 1/10W 1%
IC801
1
2
3
4
5
6
7
8
D812
LL4148
R823
0R05 1/10W 5%
R807
10K 1/10W 1%
TL494IDR
1IN+
2IN+
1IN2INFEEDBACK
REF
DTC OUTPUT CTRL
CT
VCC
RT
C2
GND
E2
C1
E1
16
15
14
13
12
11
10
9
D806
LL4148
R818
1K 1/10W 1%
Q809
RK7002
C821
0.1uF/25V
R810
51K OHM 1% 1/8W
R865
R861
NC
C846
NC
R864
NC
R854
NC
NC
R820
10K 1/10W 1%
Q807
N.C
R863
10K 1/10W 1%
R831
1K 1/8W
R826
1K 1/8W
C820
220pF50V
R824
C834
0.1uF/25V
R803
680K 1/10W
R808
10K 1/10W 1%
R835
1M 1/10W 5%
1K 1/10W 1%
C817
NC
C845
2.2uF/16V
R862
1M 1/10W 5%
D814
LL4148
T P V ( Top
Electronics
Co . ,
Ltd. )
OEM MODEL
G2852-A-4-X-5-081126
TPV MODEL
2.INVERTER
PCB NAME
Date
42
Victory
絬 隔 瓜 絪 腹
Key Component
Wednesday , Nov ember 26, 2008
Sheet
Size
Rev
715G2852-3-4
2
of
2
称爹
Custom
A
ODM MODEL
18.5″ LCD Color Monitor
BenQ G925HDA
Key Board
LED_RED#
3
1
LED_GRN#
LED001
LED
2
CN001
LBADC1
LBADC2
DC_POWERON
LED_GRN#
LED_RED#
C001
C002
C003
C004
C005
NC/0.001uF
NC/0.001uF
NC/0.001uF
NC/0.001uF
NC/0.001uF
Wire Harness
R003
R002
1K 1/10W 1%
3K 1 / 1 0 W
R006
R007
1K 1/10W 1%
3K 1 / 1 0 W
R004
R005
1K 1/10W 1%
3K 1 / 1 0 W
3
4
GND
GND
3
4
GND
GND
GND
AUTO
ZD001
C006
ZD004
C008
ZD003
5
SW002
1
2
5
SW001
3
4
NC
GND
5
SW003
SW001
2
0.1uF
GND
C010
C009
MENU
LEFT
RIGHT
4
1
2
NC
GND
ZD005
ZD002
GND
3
1
0.1uF
GND
4
5
SW004
NC
GND
3
SW002
SW003
2
NC
4
5
SW005
0.1uF
3
1
2
NC
5
SW006
C007
1
0.1uF
C011
0.1uF
ZD006
SW004
SW005
2
0.1uF
SW006
1
ENTER
POWER
GND
NC
1
2
3
4
5
6
GND
T P V ( Top
絬 隔 瓜 絪 腹
Victory
Electronics
Co . ,
G3367-C-X-X-1-081013
Key Component
Date
43
02.KEY BOARD
Wednesday , December 03, 2008
Ltd. )
OEM MODEL
Size
TPV MODEL
Rev
PCB NAME
Sheet
715G3367-C
2
of
2
称爹
B
C
<称爹>
18.5″ LCD Color Monitor
BenQ G925HDA
Troubleshooting
Frequently asked questions (FAQ)
The image is blurred:
Read the instructions on the link "Adjusting the Screen Resolution" on the CD, and then select the correct
resolution, refresh rate and make adjustments based on these instructions.
How do you use a VGA extension cable?
Remove the extension cable for the test. Is the image now in focus? If not, optimize the image by working
through the instructions in the "Adjusting the refresh rate" section on the link "Adjusting the Screen
Resolution". It is normal for blurring to occur due to conduction losses in extension cables. You can minimize
these losses by using an extension cable with better conduction quality or with a built-in booster.
Does the blurring only occur at resolutions lower than the native (maximum) resolution?
Read the instructions on the link "Adjusting the Screen Resolution" on the CD. Select the native resolution.
Pixel errors can be seen:
One of several pixels is permanently black, one or more pixels are permanently white, one or more pixels are
permanently red, green, blue or another color.
• Clean the LCD screen.
• Cycle power on-off.
• These pixels are permanently on or off and that is a natural defect occurs in LCD technology.
The image has a faulty coloration:
It has a yellow, blue or pink appearance.
Select MENU > PICTURE > Color > Reset Color, and then choose “YES” in the “Caution” message box to
reset the color settings to the factory defaults.
If the image is still not correct and the OSD also has faulty coloration, this means one of the three primary
colors is missing in the signal input. Now check the signal cable connectors. If any pin is bent or broken off,
please contact your dealer to get necessary support.
No image can be seen:
Is the prompt on the display illuminated in green?
If the LED is illuminated in green and there is a message “Out of Range” on the screen, this means you are
using a display mode that this monitor does not support, please change the setting to one of the supported
mode. Please read the “Preset display modes” section from the link "Adjusting the Screen Resolution".
Faint shadow from the static image displayed is visible on the screen:
• Activate the power management function to let your computer and monitor go into a low power "sleep"
mode when not actively in use.
• Use a screensaver to prevent the occurrence of image retention.
44
18.5″ LCD Color Monitor
BenQ G925HDA
Is the prompt on the display illuminated in orange?
If the LED is illuminated in orange, the power management mode is active. Press any button on the computer
keyboard or move the mouse. If that does not help, check the signal cable connectors. If any pin is bent or
broken off, please contact your dealer to get necessary support.
Is the prompt on the display not illuminated at all?
Check the power supply mains socket, the external power supply and the mains switch.
The image is distorted, flashes or flickers:
Read the instructions on the link "Adjusting the Screen Resolution" on the CD, and then select the correct
resolution, refresh rate and make adjustments based on these instructions.
You are running the monitor at its native resolution, but the image is still distorted.
Images from different input sources may appear distorted or stretched on the monitor running at its native
resolution. To have the optimal display performance of each type of input sources, you can use the "Display
Mode" function to set a proper aspect ratio for the input sources.
The image is displaced in one direction:
Read the instructions on the link "Adjusting the Screen Resolution" on the CD, and then select the correct
resolution, refresh rate and make adjustments based on these instructions.
The OSD controls are inaccessible:
• To unlock the OSD controls when the OSD is preset to be locked, press and hold the “MENU” key for 15
seconds to enter the “OSD Lock” option and make changes.
• Alternatively, you may use
or
keys to select “NO” in the “OSD Lock” submenu from the “OSD
Settings” menu (under SYSTEM), and all OSD controls will be accessible.
If your problems remain after checking this manual, please contact your place of purchase or e-mail us at:
[email protected]
45
18.5″ LCD Color Monitor
BenQ G925HDA
No Power
No power
NG
Check power cable is
tightened?
Re-plug the power cable
OK
NG
Check Power “On/Off”
Turn on the Power “On/Off” switch
is “On”?
OK
NG
Check the LED
Check the AC power
indicates is OK?
OK
Replace the converter board
NG
Replace main board and check connections
NG
Replace key board and check connections
46
18.5″ LCD Color Monitor
BenQ G925HDA
No Video (Power LED Green)
No Video (Power LED Green)
NG
Press the power
Replace the main board
button is OK?
OK
OK
Replace the converter
The end
board
NG
OK
Replace the main
The end
board and connection
NG
OK
Check the LVDS/FFC
Replace the LVDS/FFC
cable or panel
cable or panel
NG
Replace the key board
47
18.5″ LCD Color Monitor
BenQ G925HDA
DIM
DIM (image overlap, focus or flicker)
OK
Reset in factory mode
The end
NG
OK
Set to the optimal
frequency, select the
recommended frequency
The end
NG
OK
Readjust the phase and pixel
The end
clock in the user mode
NG
OK
Pull out signal cable and
check “Self Test Feature
Check” is ok?
Check the signal cable
and the PC
NG
NG
OK
Replace the main board
The end
NG
Replace the panel
OK
48
18.5″ LCD Color Monitor
BenQ G925HDA
Color is not optimal
Color is not optimal
Color shift
Miss color
Reset the factory mode
Replace the signal cable
NG
OK
In the user mode, set the” color
NG
The end
settings” until customer satisfy
Pull out the signal cable
and check the screen
color display is normal?
NG
OK
NG
Replace the signal cable or PC
Replace the main board
49
18.5″ LCD Color Monitor
BenQ G925HDA
PCB LAYOUT
Main Board
50
18.5″ LCD Color Monitor
BenQ G925HDA
51
18.5″ LCD Color Monitor
BenQ G925HDA
52
18.5″ LCD Color Monitor
BenQ G925HDA
Power Board
53
18.5″ LCD Color Monitor
BenQ G925HDA
54
18.5″ LCD Color Monitor
BenQ G925HDA
55
18.5″ LCD Color Monitor
BenQ G925HDA
Key Board
56
18.5″ LCD Color Monitor
Appendix 1 – Screw List / Torque
BenQ G925HDA
(T8AARPD8FWBUNN)
Part No.
Type
Description
Quantity
Torque
0M1G 130
6120
M3*6
PANEL& MAINFRAME
3
3 ± 0.5kgf.cm
0M1G1030
6120
M3*6
PCB & MAINFRAME
4
6 ± 1kgf.cm
AQ1G1740 12120
Q4*12
HINGE & STAND
2
12 ± 2kgf.cm
0M1G1740
8 47 CR3
M4*8
HINGE & STAND
1
6 ± 1kgf.cm
AM1G1740 12 47 CR3
M4*12
HINGE & STAND&MAINFRAME
2
6± 1kgf.cm
57