No Audio Output - LG BH5140S Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

5. NO AUDIO OUTPUT

5A
5B
Optical function.
YES
IC201 pin6
OPT_IN signal OK?
YES
IC201 pin11 signal OK?
YES
IC201 pin27, 28, 29, 31
I2S signal OK?
YES
CN254 pin11, 12, 15
signal OK?
YES
R612, R613 signal OK?
YES
CN600 pin24, 22, 18, 17,
16 signal OK?
YES
IC700 pin35, 39
signal OK?
YES
Replace AMP PCB
2-45
NO
Check JK203 or replace.
Check IC201 or replace
NO
X201 trace.
NO
Check IC201 or replace.
Check IC501's I2S output
NO
trace.
Check IC602's I2S output
NO
trace.
NO
Check IC101's signal trace.
Check IC700's signal or re-
NO
place IC700, IC701, IC702.