DOWNLOAD LG 42LH90QD (CHASSIS:LT91C) Service Manual ↓ Size: 7.11 MB | Pages: 72 in PDF or view online for FREE

Model
42LH90QD (CHASSIS:LT91C)
Pages
72
Size
7.11 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42lh90qd-chassis-lt91c.pdf
Date
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P800 Pin #20
Voltage level = 2V ↑
Check Power connector
OK ?
Replace Power Board
YES
NO
YES
NO
YES
Replace MAIN B’D Q802
MAIN B’D L810 = 12V ?
Replace MAIN B’D Q805
NO
Replace Main Board
YES
P800 Pin #13, 14 = 12V  
P800 Pin #17, 18 = 24V ?
Check LVDS Cable
OK ?
YES
Replace LVDS Cable
NO
Making 
Revision 
2009. 2 . 1
LCD TV
Symptom
No OSD
2/25
15
Check RF Cable
MAIN B’D L1111 = 5V ?
YES
MAIN B’D L1112 = 3.3V ?
NO
Replace MAIN B’D IC1103
YES
NO
Replace MAIN B’D IC808
MAIN B’D L1113 = 1.8V ?
Replace MAIN B’D IC1105
YES
NO
YES
MAIN B’D X1101 Clock ?
NO
Replace MAIN B’D X1101
Making 
Revision 
2009. 2 . 1
LCD TV
Symptom
Digital TV Video Problem
3/25
16
Making 
Revision 
2009. 2 . 1
LCD TV
Symptom
Analog TV Video Problem
4/25
Check RF Cable
MAIN B’D L1111 = 5V ?
YES
MAIN B’D L1112 = 3.3V ?
NO
Replace MAIN B’D IC1103
YES
NO
Replace MAIN B’D IC808
MAIN B’D L1113 = 1.8V ?
Replace MAIN B’D IC1105
YES
NO
YES
MAIN B’D X1101 Clock ?
NO
Replace MAIN B’D X1101
17
Check Signal format
Is it supported?
Check the RCA Cable
YES
MAIN B’D JK402 Check
Replace MAIN B’D JK402
YES
NO
Check MAIN B’D R420
Video Signal ?
NO
YES
Check MAIN B’D C217
Video Signal ?
Replace
MAIN B’D C217
NO
Replace MAIN B’D IC 100
YES
Making 
Revision 
2009. 2 . 1
LCD TV
Symptom
AV1 (CVBS) No Video
Problem
5/25
18
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