Download Service manual LM1931W

6HUYLFH PDQXDO
/0:
ˉ&$7$/2*ˉ
6DIHW\ LWHP
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
%HIRUH FRQQHFWLQJ WKH $& SRZHU WR WKH PRQLWRU SOHDVH PDNH VXUH WKH PRQLWRU
VSHFLILHG YROWDJH FDQ ZRUN ZLWK WKH ORFDO YROWDJH
/&' PRQLWRU VKRXOG EH SODFHG LQ D ORZ PRLVWXUH DQG ORZ GXVW
HQYLURQPHQW
3ODFH WKH PRQLWRU RQWR WKH KDUG VXUIDFH ZLWK JUHDW FDUH %HFDXVH WKH
/&' PRQLWRU VXUIDFH LV PDGH RI 3ODVWLF SDUWV DQG WKLQ JODVV VR GURSSLQJ
VKRFNLQJ RU VFUDWFKLQJ FDQ FDXVH WKH GDPDJH RI WKH /&' PRQLWRU
:KHQ FOHDU WKH PRQLWRU VXUIDFH SOHDVH GRQÿW XVH NHWRQHVXFK DV
DFHWRQH HWKDQRO WROXRO DFHWLF DFLG PHWKDQH FKORULGH DQG HWF %HFDXVH
WKHVH PDWHULDOV FDQ FDXVH GDPDJH WR WKH /&' PRQLWRU VXUIDFH
:KHQ WKH /&' PRQLWRU KDSSHQV WKH DEQRUPDO VLWXDWLRQ H[SHFLDOO\
DEQRUPDO VRXQG DQG VPHOO FDQ EH LGHQWLILHG SOHDVH XQSOXJ WKH VRFNHW
LPPHGLDWHO\
:KHQ PDLQWDLQLQJ WKH /&' PRQLWRU WR DYRLG WKH GDQJHU RQH PXVW
FRPSOHWHO\ ILQLVK WKH PRQLWRU DVVHPEO\LQFOXGLQJ GULYLQJ WKH VFUHZV LQWR
WKH PRQLWRU FRYHUV DQG WKHQ WXUQ RQ WKH PRQLWRU DQG WHVW
0RQLWRU DSSHDUDQFH DQG KDUGZDUH VWUXFWXUH LQWURGXFWLRQ
)URQW DSSHDUDQFH GUDZLQJ
1R
)XQFWLRQ
3/
,W FDQ VKRZ DQG FKDQJH PRGHO 3&*$0(029,( ZKHQ 26' L QRW VKRZQ
$872
$XWRPDWLFDOO\ DGMXVW FORFN DQG SKDVH ZKHQ 26' LV QRW VKRZQ RU SUHVV LQ
WKUHH FRQVHFXWLYH VHFRQGV WR VZLWFK 9*$'9, VLJQDO
0(18
32:(5
%OXH
,QGLFDWRU
OLJKW
3UHVV LW WR RSHQ WKH 26' 0HQX WR VHOHFW 0HQX RSWLRQV ZKHQ WKH 26'
0HQX LV GLVSOD\HG
3RZHU RQ RU RII
%OXH DQG
IOLFNHU
/(' 2))
(;,7
'2:1
83
9ROXPH DGMXVW KRW NH\ ZKHQ 26' LV QRW GLVSOD\HG XVHG IRU UHWXUQLQJ WR
IRUPHU 26' ZKHQ 26' PHQX LV GLVSOD\HG
&RQWUDVW UDWLR NH\ ZKHQ 26' LV QRW GLVSOD\HG PRYH WKH VHOHFWHG PHQX
GRZQ ZKHQ 26' LV GLVSOD\HG GHFUHDVH WKH YDOXH ZKHQ HQWHU LQWR WKH
26'
%ULJKWQHVV NH\ ZKHQ 26' LV QRW GLVSOD\HG PRYH WKH VHOHFWHG PHQX XS
LQFUHDVH WKH YDOXH ZKHQ HQWHU LQWR WKH 26'
%DFN $SSHDUDQFH 'UDZLQJ
12
1DPH
3RZHU LQSXW
$8',2 LQSXW237,21
'9, LQSXW
9*$ LQSXW
63($.(5 :
([SORVLRQ 'UDZLQJ
1R
3$576 1$0(
)5217 &29(5
/()7 %5$&.(7
3$1(/
/()7 %5$&.(7
$' %2$5'
/&' &$%(/
/()7 63($.(5
/LSV %2$5'
6+,(/' &21(5
5,*+7 63($.(5
/()7 63($.(5 &29(5
%$&. &29(5
5,*+7 63($.(5 &21(5
&+$66,6 %27720
+,1*
67$1' %$&.
%87721 $&&(6625,=(
.(< %2$5'
%87720 &29(5
67$1' )5217
67$1' %$6(
58%%(5 6+((7
4
7<
6\VWHP %ORFN 'LDJUDP
'68% 3LQ 'HILQLWLRQ
'9, 3LQ 'HILQLWLRQ
3LQ 1R
)XQFWLRQ
3LQ 1R
)XQFWLRQ
3LQ 1R
)XQFWLRQ
3LQ 1R
)XQFWLRQ
'$7$
'$7$
*1'
'$7$
'$7$
''& &/.
''& '$7$
$96<1&
'$7$
'$7$
*1'
'$7$
'$7$
9&& 9
*1'
+3/8*
'$7$
'$7$
*1'
'$7$
'$7$
*1'
&/.
&/.
1&
1&
1&
1&
1&
26' .H\ )XQFWLRQ
3/˖
3/ ,W FDQ VKRZ DQG FKDQJH PRGHO 3&*$0(029,( ZKHQ 26' L QRW VKRZQ
$XWR DXWRPDWLF DGMXVWPHQW NH\˖DXWRPDWLFDOO\ DGMXVW FORFN DQG SKDVH NH\ ZKHQ 26' LV GLVSOD\HG
SUHVV LQ FRQVHFXWLYH VHFRQGV WR VZLWFK 9*$'9, VLJQDO
0(18
0(18˖3UHVV LW WR RSHQ 26' PHQX WR VHOHFW 0HQX RSWLRQV ZKHQ WKH 26' PHQX LV GLVSOD\HG
32:(5
˖3RZHU RQ RU RII
(;,7
(;,7˖9ROXPH DGMXVW KRW NH\ ZKHQ 26' LV QRW GLVSOD\HG XVHG IRU UHWXUQLQJ WR IRUPHU 26' ZKHQ
26' PHQX LV GLVSOD\HG
'2:1
˖&RQWUDVW UDWLR NH\ ZKHQ 26' LV QRW GLVSOD\HG PRYH WKH VHOHFWHG PHQX GRZQ ZKHQ
26' LV GLVSOD\HG GHFUHDVH WKH YDOXH ZKHQ HQWHU LQWR WKH 26'
83
˖%ULJKWQHVV NH\ ZKHQ 26' LV QRW GLVSOD\HG PRYH WKH VHOHFWHG PHQX XS LQFUHDVH WKH YDOXH
ZKHQ HQWHU LQWR WKH 26'
3UHVV WKH ³0(18´ EXWWRQ WR VWDUW WKH 26' IXQFWLRQ
3UHH´
´RU´
´EXWWRQ WR VHOHFW DGMXVWLQJ IXQFWLRQ
3UHVV ³0(18´ EXWWRQ WR HQWHU LQWR WKH IXQFWLRQ ZKLFK LV JRLQJ WR EH DGMXVWHG
3UHH´
´RU´
´EXWWRQ WR FKDQJH WKH SUHVHQW VHWWLQJ YDOXH RI WKH IXQFWLRQ
3UHVV ³([LW´ WR OHDYH WKH 26' PHQX RU UHWXUQ WR WKH IRUPHU DFWLRQ DQG LW FDQ VWRUH WKH FKDQJH SRLQWV
$WWHQWLRQ
3UHVV
EXWWRQ WR PRYH 26' LQ D QXPHULFDO RUGHU
3UHVV
EXWWRQ WR PRYH 26' LQ D UHYHUVH QXPHULFDO RUGHUҏ
/DQJXDJH˖(1*/,6+ǃ)UDQFDLVǃ'HXWVFKǃ(VSDQROǃ,WDOLDQRǃ-DSDQHVHǃ.RUHDQǃVLPSOLILHG
&KLQHVH
,QSXW VLJQDO FKRLFH 9*$ LQSXW VLJQDO LV DQDORJXH '9, LQSXW
VLJQDO LV GLJLWDO
3.Maintaining Instruments and Test Equipment
Definition: Defect circuit board and the inside signal cable change.
3-1 Instruments
1.Multimet
2.Electric screwdriver
3.
Cross head driver
Hex screw driver
3-2 Test equipment
PC for test
8
PDF created with pdfFactory Pro trial version www.pdffactory.com
4.Problem analysis
Problem phenomenon
Problem analysis
Maintenance
Test
Light on test
Flickering dot
Display
abnormally
Bright dot
dark dot
back light
light leakage
MURA
inspect the panel
Image
conglutination
replace the panel
Bright spot
Minute granule
Defect dot
Picture retention
Group bright dots
Other
defect
Next stop
surface
NG
Inspec
tion
Accomplish
A
9
PDF created with pdfFactory Pro trial version www.pdffactory.com
Problem phenomenon
Problem analysis
Maintenance
Test
A
Display
interference
Inspect PCB
Power
display
abnormal
change A/D
board
on
change power
board
change inverter
Flickering
Flickering after
shock
Inspect panel
change panel
No
display
after shock
change AD
board
Waver
Inspect PCB
change power
board
Inspect panel
PANEL
No back light
Next step
B
NG
Inspe
ction
accomplish
10
PDF created with pdfFactory Pro trial version www.pdffactory.com
Problem phenomenon
Problem analysis
Maintenance
Test
B
change
A/Dboard
Whit screen
display
Inspect PCB
start-up delay
Inspect PCB
change power
board
change inverter
change key
board
brightness
nonuniformity
Inspect PCB
change power
board
change inverter
no back light
when shock
Inspect
PANEL
change panel
No signal
Inspect PCB
change AD
board
Inspect wire
change signal
cable
Inspect panel
change DVI
cable
RGB
display
abnormal
Grey
scale
abnormal
change panel
next step
NG
inspe
ction
C
accomplish
11
PDF created with pdfFactory Pro trial version www.pdffactory.com
Problem phenomenon
Problem analysis
Maintenance
Test
C
H. line defect
Inspect PCB
change A/D
board
Inspect panel
change panel
Inspect PCB
change A/D
board
V. broken line
H. broken line
V. band
H. band
Power saving
abnormal
change A/D
board
Special smell
Inspect PCB
change power
board
change inverter
next step
NG
inspe
ction
accomplish
12
PDF created with pdfFactory Pro trial version www.pdffactory.com
Problem phenomenon
Problem analysis
Maintenance
Test
change A/D
board
Power on & off
abnormal
change power
board
No electricity
Power
abnormal
Inspect PCB
off
Inspect PCB
change inverter
change key
board
Inspect wire
change key
board wire
Inspect wire
change power
cord
change AD
board
LED
display
abnormal
LED no light
Inspect PCB
change power
board
change inverter
LEDdark
change key
board
LED abnormal
Inspect wire
change key
board wire
LEDdamage
LEDflickering
next step
NG
inspe
ction
accomplish
13
PDF created with pdfFactory Pro trial version www.pdffactory.com
0RQLWRU 'LVDVVHPEO\ DQG $VVHPEO\ )ORZ
ϡ 0XVW DYRLG SDQHO VFUDWFK
ϡ 0XVW SUHYHQW VWDWLF SUREOHPV
'LVDVVHPEOH WKH VXSSRUW QHFN
'LVDVVHPEOH WKH IURQW FRYHU
'LVDVVHPEOH WKH SDQHO
'LVDVVHPEOH $' ERDUG SRZHU ERDUG DQG LQYHUWHU ERDUG
'LVDVVHPEOH WKH VSHDNHU FRYHU
ˊ3XW PRQLWRU IODW RQ FXVKLRQ DV IROORZLQJ SKRWR VKRZQ WKHQ SUHVV FRYHU ODWFK VRIWO\
7DNH WKH 67$1' %$&. RXW ZLWK KDQGV
,I LW LV GLIILFXOW WR GLVDVVHPEOH 67$1' %$&. WKHQ WDNH 67$1' %$&. RII ZLWK IODWKHDGHG VFUHZGULYHU IURP JDSV
EHWZHHQ 67$1' %$&. DQG IURQW FRYHU DV SKRWR VKRZQ
7DNH RII IRXU PDUNHG KLQJH IL[DWLRQ VFUHZV ZLWK VFUHZGULYHU DV SKRWR VKRZQ WKHQ WDNH RII KLQJH DQG SXW PRQLWRU IODW RQ
FXVKLRQ
/RFN PRQLWRU IURQW FRYHU DV SKRWR VKRZQ ORFDWLRQ ZLWK ERWK KDQGV DQG SXW PRQLWRU DVLGH
6FUHZ RII WKH WZR VFUHZV DV SKRWR VKRZQ XVHG IRU NH\ ERDUG IL[DWLRQ
$V SKRWR VKRZQ SOXJ RII NH\ FRQQHFWLQJ ZLUH DQG WDNH RII NH\ ERDUG
8. As following photo shown, take off eight screws used for panel fixation.
9. Hold up panel softly and plug off two lamp wire as photo shown
18
$V SKRWR VKRZQ SOXJ RII DQRWKHU WZR ODPS ZLUH DQG SDQHO ))& ZLUH
$V IROORZLQJ SKRWR VKRZQ WHDU RII WDSH DFHWDWH VWXFN RQ SDQHO LQWHUIDFH WKHQ SOXJ RII SDQHO ZLUH DQG SXW SDQHO DVLGH
$V IROORZLQJ SKRWR VKRZQ WDNH RII WKH IRXU FRSSHU SROHV RQ 9*$ DQG '9, LQWHUIDFH RI WKH PRQLWRU ERWWRP
$V IROORZLQJ SKRWR VKRZQ WDNH RII VFUHZV RI $' ERDUG LQYHUWHU /LSV ERDUG DQG FRYHU VKLHOG IL[DWLRQ
$V IROORZLQJ SKRWR VKRZQ SOXJ RII VSHDNHU ZLUH RQ $' ERDUG WDNH RII $' ERDUG LQYHUWHU DQG /LSV ERDUG
$V IROORZLQJ SKRWR VKRZQ WDNH RII WKH IRXU VFUHZV XVHG IRU VSHDNHU FRYHU IL[DWLRQ DQG WDNH RII WKH WZR VSHDNHU FRYHUV
DW WKH VDPH WLPH
$V IROORZLQJ SKRWR VKRZQ SOXJ RII FRQQHFWLQJ ZLUH DPRQJ $' ERDUG LQYHUWHU DQG /LSV ERDUG
$V IROORZLQJ SKRWR VKRZQ SXVK SDQHO ZLUH ORFN SDUDOOHOO\ DQG WKHQ SOXJ RII SDQHO ZLUH IURP $' ERDUG LQWHUIDFH
0DLQWDLQLQJ 3DUWV )RUP
,WHP
3DUW QDPH
$' ERDUG
,QYHUWHU ERDUG
3RZHU ERDUG
.H\ ERDUG
)URQW FRYHU
%DFN FRYHU
6WDQG EDVH
6WDQG EDVH VXSSRUW XS FRYHU
6WDQG EDVH VXSSRUW GRZQ FRYHU
%XWWRQ NQRE