LG CMS9540F Service Manual page 53

ELECTRICAL TROUBLESHOOTING GUIDE
POT. IN
IC202
Pin21,22 POT. IN input signal
OK?
YES
IC202
Pin42,43,44 I2S input signal
OK?
YES
IC202 Pin41
ADC/MIC_data output signal
OK?
YES
A
TUNER
IC202
Pin23,24 TUNER_L/R input
signal OK?
YES
IC202
Pin42,43,44 I2S input
signal OK?
YES
IC202
Pin41 ADC data output
signal OK?
YES
A
NO
Check MIC board.
NO
NO
TU500
NO
TUNER_L/R output
signal OK?
NO
Check IC501.
NO
Replace IC202.
3-32
Check IC501.
Replace IC202.
NO
YES
Check +3.3 V of TU500.