Read LG 42LN549C / 42LN549E (CHASSIS:LJ3AC) Service Manual online
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Analog TV Video Trouble Shooting
Check RF Cable
Check CVBS signal
TU100 #16 Pin
Maybe Tuner(TU400) has
problems
Y
N
Y
N
Y
Maybe FI-8668(IC506) has
problems
Check Tuner 5V Power
IC701
Replace IC701
Check IIC Signal
TU400 #7, 8 Pin
Maybe Tuner(TU400) has
problems
N
Y
Component Video Trouble Shooting
Check signal format
Is it supported?
Check signal
R615,R616,R617(Y,CB,CR)
Replace it.
Y
N
Check JK601
Replace connector
Y
N
Y
Maybe LGE1854C(IC100) has
problems
Y
Check Component Cable
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