LG 42lk530 Service Manual page 61

10. Trouble shooting - No audio (Analog TV audio)
Check RF Cable & Signal
ok
Check Tuner 5V Power
L2101,L2104
ok
Check Tuner 3.3V Power
L2103
ok
Check Tuner 1.2V Power
IC2103 2 pin : 1.2V
ok
Check SIF Signal
TU2101 9th Pin
ok
Check TU_SIF path
Including Q2104 TR buffer to LGE35230
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 component
No
Replace IC507
ok
Replace L2101,2104
LGE Internal Use Only