LG CM9750 - Page 50

3-31
ELECTRICAL TROUBLESHOOTING GUIDE
A
YES
YES
YES
PORTABLE FUNCTION
Check FRONT board.
Replace IC201.
Check IC501.
NO
NO
NO
IC201
pin9, 10 PT_L/R input signal
OK?
IC201 pin41
ADC_DATA_IN output signal
OK?
IC201
pin42, 43, 44 I2S input signal
OK?
TUNER FUNCTION
Check IC501.
Replace IC201.
Check +3.3 V of TU500.
IC201
pin42, 43, 44 I2S input
signal OK?
IC201
pin41 ADC_DATA_IN output
signal OK?
NO
NO
NO
TU500
TUNER_L/R output
signal OK?
YES
A
IC201 pin26, 27
TUNER_L/R input signal
OK?
NO
YES
YES
YES