DOWNLOAD LG 42LH4000 / 42LH4010 / 42LH4020 (CHASSIS:LD91G) Service Manual ↓ Size: 3.98 MB | Pages: 73 in PDF or view online for FREE

Model
42LH4000 42LH4010 42LH4020 (CHASSIS:LD91G)
Pages
73
Size
3.98 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42lh4000-42lh4010-42lh4020-chassis-ld91g.pdf
Date
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LG 42LH4000 / 42LH4010 / 42LH4020 (CHASSIS:LD91G) 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
CHECK MAIN B’D 
JK700 or JK701
YES
Replace MAIN B’D 
JK700 or JK701
NO
_ If headphone is connected, Speaker sound doesn’
t work.
Replace MAIN B’D IC803
NO
YES
MAIN B’D
L700 = 1.8V
MAIN B’D
Check R720, R721, R722
Signal
YES
Replace MAIN B’D IC100
NO
Replace MAIN B’D IC701
NO
Making 
Revision 
2009. 2 . 1
18/34
 LCD TV
Symptom
All Source no Audio Problem
26~42LH2000
32~47LH3000/LH4000
Digital TV Video OK ?
YES
Replace MAIN B’D IC 100
Making 
Revision 
2009. 2 . 1
19/34
 LCD TV
Symptom
Digital TV No Audio Problem
26~42LH2000
32~47LH3000/LH4000
MAIN B’D TU1200
Pin #17 Signal (SIF)
Replace MAIN B’D TU1200
NO
Analog TV Video OK ?
YES
Check MAIN B’D
C231 Signal (SIF)
NO
Replace MAIN B’D IC100
YES
Making 
Revision 
2009. 2 . 1
20/34
 LCD TV
Symptom
Analog TV No Audio Problem
26~42LH2000
32~47LH3000/LH4000
Check the SCART Cable
YES
Check MAIN B’D
C229, C230
MAIN B’D
C229 (Right Sound)
C230 (Left Sound)
signal ?
YES
NO
Replace MAIN B’D IC 100
AV1 Video OK ?
YES
Check MAIN B’D JK1100
Replace MAIN B’D JK1100
NO
YES
Making 
Revision 
2009. 2 . 1
21/34
 LCD TV
Symptom
AV1 No Audio Problem
26~42LH2000
32~47LH3000/LH4000
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