LG CM4520 Service Manual page 42

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE
A
YES
Check
IC601(PS9854)
input data
Pin4, 5, 6
PWM wave.
YES
Check
PWM
modulator output
FL: Pin26(-),27(+)
FR: Pin28(-),29(+)
and others.
YES
OK
Check
NO
CD Assy communication
Pin4, 5, 6.
YES
Check
IC601(PS9854) input
data.
YES
OK
NO
Check
IC601(PS9854).
YES
OK
3-23
NO
Refer to
CD troubleshooting.
NO
Check each line
resistor output.
NO
Replace IC601(PS9854).