LG CJ87 - Page 60

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