LG 49LF5400 Service Manual page 21

7. Digital / Analog TV Audio
Check RF Cable & Signal
OK
Check Tuner 3.3V Power
L500
OK
Check Tuner I2C
AR500, R502, R503
OK
Check IF_P/N Signal
TU501 6/7 Pin
OK
Follow procedure
'7. All source audio'
trouble shooting guide.
8. AV Audio
Check AV Cable for damage
for damage or open conductor
OK
Check JK401 Signal Line
R409 ,R406
OK
Follow procedure
'7. All source audio'
trouble shooting guide.
9. Component Audio
Check Component Cable
for damage or open conductor.
OK
Check JK401 Signal Line
R409 ,R406
OK
Follow procedure
'7. All source audio'
trouble shooting guide.
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Only for training and service purposes
NO
Replace L500
NO
Replace AR500, R502,
R503
NO
B a d Tu n e r. R e p l a c e
Tuner.
NO
Replace Jack
NO
Replace Jack
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LGE Internal Use Only