LG 43LX310C Service Manual page 15

2. Digital/Analog TV Video
Check RF Cable & Signal
ok
Check Tuner 3.3V Power
L3701, L3704
ok
Check IF_P/N Signal
TU3700, 6/7 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 JK4400, CVBS Signal Line
R242
ok
Check CVBS_DET Signal
R4410
ok
Check Mstar LVDS Output
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Only for training and service purposes
No
Replace L3701,L3704
No
Bad Tuner. Replace Tuner.
No
Replace Mstar(IC101) or Main Board.
No
Replace Jack
No
Replace R4410
No
Replace Mstar(IC101) or Main Board.
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