LG RAT376B Service Manual page 42

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE
A
YES
Check
IC602(PS9850)
input data
Pin4, 5, 6
PWM wave.
YES
Check
PWM
modulator output
FL: Pin31(+),30(-)
FR: Pin28(+),27(-)
and others.
YES
OK
Check
NO
CD Assy communication
Pin4, 5, 6.
YES
Check
IC602(PS9850) input
data.
YES
OK
NO
Check
IC602(PS9850).
YES
OK
3-23
NO
Refer to
CD troubleshooting.
NO
Check each line
resistor output.
NO
Replace IC602(PS9850).