LG FH6 Service Manual page 46

ELECTRICAL TROUBLESHOOTING GUIDE
4. NO AUDIO OUTPUT
No Audio Output
IC701 PWM_3V3 OK?
X701 12.288 MHz OK?
IC701 pin20, 21, 22, 23, 24 data OK?
IC702 PVDD(40 V/ 50 V), 12 V OK?
CN702, CN703 cable and CNT OK?
Change IC702.
YES
YES
YES
YES
YES
A
NO
Check IC304 pin3 & pin2.
NO
NO
Check IC501 pin B10/ D7/ C7/ D8/ C8.
NO
Check SMPS board (PVDD) and IC301 (12 V).
NO
Change CN702 or CN703.
3-27
Replace X701.