LG LGXBR342 Service Manual page 50

VDR ELECTRICAL TROUBLESHOOTING GUIDE
When playing DISC,
no audio output
NO
IC7601-1 : HIGH
DAC RESET status
YES
NO
IC7601-8, 9 I C sig-
2
nal normal
YES
Check IC7601 power
And Other circuits
No TUNER
audio output
NO
Audio output even
When playing DISC
YES
NO
PN7401-6, 7 :
6, 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
Check IC2078 power
and other circuits
Check R110, R109,
R7637, R7638
<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 OPTICAL /
DIGITAL output
IC7401-1
signal normal
YES
Check FFC Cable
Signal flow
3-60
NO
Check VCR PART