LG CJ87 Service Manual page 60

ELECTRICAL TROUBLESHOOTING GUIDE
NO AUDIO CHECK
POT. IN
IC200
pin29, 30 POT. IN input signal
OK?
YES
IC200
pin15, 16, 17 I2S input signal
OK?
YES
IC200 pin18
ADC_data output signal
OK?
YES
A
TUNER
IC200 pin1, 2
TUNER_L/R input signal
OK?
YES
IC200
pin15 ~ 17 I2S input
signal OK?
YES
IC200
pin18 ADC data output
signal OK?
YES
A
NO
Check FRONT board.
NO
NO
TUN200
NO
TUNER_L/R output
signal OK?
NO
Check IC501.
NO
Replace IC200.
3-31
Check IC501.
Replace IC200.
NO
YES
Check +3.3 V of TUN200.