Cvbs Video Output; Audio Output - LG BH4120SN Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE
5. NO CVBS VIDEO OUTPUT
No CVBS video on Display.
Is there CVBS signal on L2V1?
Check JK251 and RCA cable connection.
6. NO AUDIO OUTPUT
6A
YES
YES
BD/CD/DVD disc or USB play.
CN401 pin11, 12, 15
signal OK?
R623, R624 signal OK?
CN600 pin24, 22, 18, 17,
16 signal OK?
IC700 pin35, 39
signal OK?
Replace AMP PCB
NO
Check IC501's VCC or replace IC501.
YES
NO
YES
NO
YES
NO
YES
NO
YES
2-44
Check IC501's I2S output
trace.
Check IC602's I2S output
trace.
Check IC101's signal trace.
Check IC700 or replace
IC700, IC701.