LG CMS4540F/W Service Manual page 42

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE
A
YES
Check
IC601(TAS5548)
input data
Pin24
PWM wave.
YES
Check PWM
modulator output
FL: Pin48(-),49(+)
FR: Pin46(-),47(+).
Other output
check.
YES
OK
Check
NO
CD Assy communication
Pin22, 23, 24.
YES
Check
IC601 input
data.
YES
OK
NO
Check IC601.
YES
OK
3-23
NO
Refer to
CD troubleshooting.
NO
Check each line
resistor output.
NO
Replace IC601.