LG 37LD450 Service Manual page 54

10. Analog TV Audio
Check RF Cable & Signal
ok
Check Tuner 5V Power
L5002
ok
Check Tuner 3.3V Power
L5003
ok
Check Tuner 1.2V Power
IC5001 2 pin : 1.2V
ok
Check CVBS Signal
TU5001 11 Pin
ok
Follow procedure
'8. All source audio'
trouble shooting guide.
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Only for training and service purposes
No
Check IC401
No
Replace L5003
No
Replace IC5001.
No
Bad Tuner. Replace Tuner.
No
Replace IC401
ok
Replace L5002
LGE Internal Use Only