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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LG 42LH90QD (CHASSIS:LT91C) Service Manual ▷ View online

Digital TV Video OK ?
YES
Replace MAIN B’D IC 100
Making 
Revision 
2009. 2 . 1
14/25
LCD TV
Symptom
Digital TV No Audio Problem
27
MAIN B’D
L1101 Signal (SIF)
Replace MAIN B’D IC1102
NO
Analog TV Video OK ?
YES
Check MAIN B’D
R2046 Signal (SIF)
NO
Replace MAIN B’D IC100
YES
Making 
Revision 
2009. 2 . 1
15/25
LCD TV
Symptom
Analog TV No Audio Problem
28
Check the RCA Cable
YES
Check MAIN B’D
C229, C230
MAIN B’D
C2011 (Right Sound)
C2012 (Left Sound)
signal ?
YES
NO
Replace MAIN B’D IC 100
AV1 Video OK ?
YES
Check MAIN B’D JK402
Replace MAIN B’D JK402
NO
YES
Making 
Revision 
2009. 2 . 1
16/25
LCD TV
Symptom
AV1 No Audio Problem
29
Check the RCA Cable
YES
Check MAIN B’D
C2008, C2009
MAIN B’D
C2008 (Right Sound)
C2009 (Left Sound)
signal ?
YES
NO
Replace MAIN B’D IC 100
AV2 Video OK ?
YES
Check MAIN B’D JK402
Replace MAIN B’D JK402
NO
YES
Making 
Revision 
2009. 2 . 1
17/25
LCD TV
Symptom
AV2 No Audio Problem
30
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