LG HT806TGW Service Manual page 51

ELECTRICAL TROUBLESHOOTING GUIDE
No sound.
Check IC901
Vcc voltage (14 V ~ 17 V).
YES
Check C962
voltage ( 25 V or 30 V).
YES
Replace IC901 or
SMPS board.
NO
Check no power list, AC input voltage.
NO
Check AMP module short.
Replace PC902, IC953.
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