No Audio Output - LG LAB550H Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

5. NO AUDIO OUTPUT

No AUDIO output
IC401 3.3 V, 1.2 V OK?
X401 24.576 MHz OK?
IC401 pin19, 20, 21, 22, 23, 24
I2C data OK?
IC703
A_PVDD (22.3 V) OK?
IC703
pin2, 3, 12 OK?
Replace IC703.
YES
YES
YES
YES
YES
YES
NO
Check IC157, IC153.
NO
NO
Check IC501 B10 / D7 / C7 / D8 / C8 pin.
NO
Check SMPS board.
NO
2-49
Replace X401.
Check IC101.