LG LGXBR342 Service Manual page 51

VDR ELECTRICAL TROUBLESHOOTING GUIDE
No External
Input 1 audio
NO
Audio output even
When playing DISC
YES
NO
PN7401-6, 7 :
6 High / 7 Low
YES
NO
PN7601-19~22
Check audio signals
YES
NO
IC6904 – 1, 7
Check audio signals
YES
NO
IC6905-16
Check High?
YES
Check IC6905 power
And Other circuits
<when playing DISC,
no audio output> check
Check IC2076 power and
R2602, R2603 signal
Check FFC Cable
and VCR part
Check IC6904 power
and other circuits
Check IC2078 – 15
and power, other circuits
No External
Input 2 audio
Audio output even
When playing DISC
YES
PN5401 - 4~6
Check audio signals
YES
PN7401 - 6, 7 :
6 Low / 7 High
YES
PN7601-19~22
Check audio signals
YES
IC6904 – 1, 7
Check audio signals
YES
IC6905 - 16
Check High?
YES
Check IC6905 power
And Other circuits
3-61
NO
<when playing DISC,
no audio output> check
NO
Check Audio Cable
NO
Check IC2076 power and
R2602, R2603 signal
NO
Check FFC Cable
and VCR part
NO
Check IC6904 power
and other circuits
NO
Check IC2078 – 15
and power, other circuits