LG LAP340 - Audio Output in Optical Function; Audio Output in Bt Function

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ELECTRICAL TROUBLESHOOTING GUIDE
5. NO AUDIO OUTPUT IN OPTICAL FUNCTION
6. NO AUDIO OUTPUT IN BT FUNCTION
Optical function.
BT function
Check JK301 or 3.3VA_MICOM.
Check BT module or replace.
Check IC303 or replace.
Check IC301 or replace.
Check IC301 or replace.
JK301 Pin1 OPT_IN signal OK?
CN302 Pin5, 7, 9, 10 signal OK?
IC303 Pin1, 2 signal OK?
IC301 Pin52, 53, 54 I2S signal OK?
IC301 Pin52, 53, 54 I2S signal OK?
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
A
A