Read LG 42LV5400 (CHASSIS:LA12E) Service Manual online
Check RF Cable & Signal
Check Tuner 3.3V Power
L2103
Replace L2103
Check Tuner 1.2V Power
IC2103 2 pin : 1.2V
Replace IC2103.
ok
ok
No
No
Check Tuner 5V Power
L2101,L2104
ok
Check IC507
No
Replace IC507
No
Replace L2101,2104
ok
10. Trouble shooting - No audio (Analog TV audio)
Check TU_SIF path
Including Q2104 TR buffer to LGE35230
ok
Check SIF Signal
TU2101 9th Pin
ok
No
Bad Tuner. Replace Tuner.
Follow procedure
‘8. All source audio’
trouble shooting guide.
ok
No
Replace component
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