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LG 26LH2000 Service Manual

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Page 71

Check the SCART Cable
YES
Replace MAIN B’D
IC1103
MAIN B’D
R250 (Right Sound)
R251 (Left Sound)
signal ?
NO
YES
Replace MAIN B’D IC 100
Speaker Audio OK
YES
Check MAIN B’D JK1101
Replace MAIN B’D JK1101
NO
YES
Check the Trouble Shooting Guide
Related to Audio Problem
NO
Making 
Revision 2009. 2 . 1
28/34
 LCD TV
Symptom
AV2 No Audio Out Problem
26~42LH2000
32~47LH3000/LH4000
 

Page 72

Check the Headphone Cable
YES
Replace MAIN B’D
IC700
MAIN B’D
R237 (Right Sound)
R238 (Left Sound)
signal ?
NO
YES
Replace MAIN B’D IC 100
Speaker Audio OK
YES
Check MAIN B’D JK700 or JK701
Replace MAIN B’D JK700 or JK701
NO
YES
Check the Trouble Shooting Guide
Related to Audio Problem
NO
Making 
Revision 2009. 2 . 1
29/34
 LCD TV
Symptom
Headphone No Audio Problem
26~42LH2000
32~47LH3000/LH4000
 

Page 73

Check the SPDIF Cable
YES
Check MAIN B’D R230
PWM Signal ?Replace MAIN B’D IC 100
Speaker Audio OK
YES
Check MAIN B’D JK403
Replace MAIN B’D JK403
NO
YESNO
Check the Trouble Shooting Guide
Related to Audio Problem
NO
Making 
Revision 2009. 2 . 1
30/34
 LCD TV
Symptom
SPDIF No Audio Problem
26~42LH2000
32~47LH3000/LH4000
 

Page 74

Check MAIN B’D
JK405 Pin #1 5V ?
NO
Check MAIN B’D
R848 12V ?
Check that the USB Memory & HDD are supported by Spec
(Refer to User Manual’s USB cautions)
YES
Check MAIN B’D
R801 5V ?
Replace MAIN B’D IC402
YES
NO
Replace MAIN B’D IC808
YESYES
Replace MAIN B’D IC 100
Check MAIN B’D
JK405 OK ?
YES
NO
Replace MAIN B’D JK405
Making 
Revision 2009. 2 . 1
31/34
 LCD TV
Symptom
USB No Connect Problem
32~47LH4000
 

Page 75

Check IR B’D P1 Wafer
& ConnectorCheck MAIN B’D P1304
Wafer & Connector
YES
NO
Replace it
YES
Replace IR B’D
Making 
Revision 2009. 2 . 1
32/34
 LCD TV
Symptom
Remote Control Problem
26~42LH2000
32~47LH3000/LH4000
 

Page 76

Check IR B’D P1 Wafer
& ConnectorCheck MAIN B’D P1305
Wafer & Connector
YES
NO
Replace MAIN B’D IC100
IR B’D IC1 Pin #3
Voltage 4V 
 ?
NO
NO
Replace it
YES
Replace IR B’D IC1
NO
Replace MAIN B’D IC100
Making 
Revision 2009. 2 . 1
33/34
 LCD TV
Symptom
Remote Control Problem
19~22LH2000
 

Page 77

Check IR B’D P1 Wafer
& ConnectorCheck MAIN B’D P1304
Wafer & Connector
YES
YESNO
Replace itReplace IR B’D
Making 
Revision 2009. 2 . 1
34/34
 LCD TV
Symptom
Intelligent Sensor Problem
32~47LH4000
 
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