LG 42LN541C Service Manual page 15

2. Digital/Analog TV Video
Check RF Cable & Signal
ok
Check Tuner 3.3V Power
L1003
ok
Check Tuner 1.8V Power
IC1001 2 pin : 1.8V
ok
Check IF_P/N Signal
TU1002 10/11 Pin
ok
Check Mstar LVDS Output
3. AV Video
Check input signal format.
Is it supported?
ok
Check AV Cable for damage
for damage or open conductor
ok
Check JK701, CVBS Signal Line
R246
ok
Check CVBS_DET Signal
R705
ok
Check Mstar LVDS Output
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Only for training and service purposes
No
Replace L1003
No
Replace IC1001
No
Bad Tuner. Replace Tuner.
No
Replace Mstar(IC101) or Main Board.
No
Replace Jack
No
Replace R705
No
Replace Mstar(IC101) or Main Board.
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