LG CM8440 Series - Page 53

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