LG OK99 Service Manual page 55

ELECTRICAL TROUBLESHOOTING GUIDE
NO AUDIO CHECK
POT. IN
IC301
pin29, 30 PT_L/R input signal
OK?
YES
IC301
pin15, 16, 17 I2S input signal
OK?
YES
IC301
pin18 ADC_data output signal
OK?
YES
A
TUNER
IC301
pin27, 28 TUNER_L/R input
signal OK?
YES
IC301
pin15, 16, 17 I2S input
signal OK?
YES
IC301 pin18
ADC_data output signal
OK?
YES
A
NO
Check portable jack.
NO
NO
NO
IC302 pin5, 6, 7, 8 TUNER
control input signal OK?
NO
Check control signal
from IC501 to IC301.
NO
Replace IC301.
3-30
Check IC501.
Replace IC301.
NO
Copyright © 2018 LG Electronics Inc. All rights reserved.
Check control signal
from IC501 to IC302
Only for training and service purposes.