Read LG 55LN541C (CHASSIS:LA3AA) Service Manual online
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2. Digital/Analog TV Video
Check RF Cable & Signal
Check Tuner 3.3V Power
L1003
Replace L1003
Check Tuner 1.8V Power
IC1001 2 pin : 1.8V
Check IF_P/N Signal
TU1002 10/11 Pin
Replace IC1001
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
ok
ok
ok
ok
No
No
No
No
Bad Tuner. Replace Tuner.
3. AV Video
Check input signal format.
Is it supported?
Check AV Cable for damage
for damage or open conductor
Check JK701, CVBS Signal Line
R246
ok
ok
ok
No
Replace Jack
ok
Check CVBS_DET Signal
R705
Replace R705
No
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
No
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