LG 47LW6500-UA Service Manual page 69

9. Trouble shooting - No audio (Digital TV audio)
Check RF Cable & Signal
ok
Check Tuner 5V Power
L2101,L2104
ok
Check Tuner 3.3V Power
L2103
ok
Check Tuner 1.26V Power
IC2103 2 pin : 1.26V
ok
Check IF_P/N Signal
TU2101 17,18 Pin
ok
Follow procedure
'8. All source audio'
trouble shooting guide.
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Only for training and service purposes
No
Check IC507
No
Replace L2103
No
Replace IC2103
No
Bad Tuner. Replace Tuner.
No
Replace IC507
ok
Replace L2101,2104
LGE Internal Use Only