DOWNLOAD LG 42LH20D (CHASSIS:LB91A) Service Manual ↓ Size: 5.09 MB | Pages: 65 in PDF or view online for FREE

Model
42LH20D (CHASSIS:LB91A)
Pages
65
Size
5.09 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42lh20d-chassis-lb91a.pdf
Date
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LG 42LH20D (CHASSIS:LB91A) Service Manual ▷ View online

Check The Speaker
Check Speaker Cable
YES
Check P700 Cable
YES
NO
Replace MAIN B’D IC 701
YES
MAIN B’D
L705 Pin #1
L704 Pin #2
PWM Signal ?
Replace Speaker
NO
Replace Speaker Cable
NO
Replace MAIN B’D IC807
NO
YES
MAIN B’D
L824 = 1.8V
MAIN B’D
Check R701, R702, R705
Signal
YES
Replace MAIN B’D IC100
NO
Replace MAIN B’D IC701
NO
Making 
Revision 
2009. 2 . 1
13/25
LCD TV
Symptom
All Source no Audio Problem
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
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
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
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