LG 39LB5600 Service Manual page 17

2. Digital/Analog TV Video
Check RF Cable & Signal
ok
Check Tuner 3.3V Power
L3703
ok
Check Tuner 1.8V Power
IC3703 2 pin : 1.8V
ok
Check IF_P/N Signal
TU3700 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 JK1701, CVBS Signal Line
R1707
ok
Check CVBS_DET Signal
ok
Check Mstar LVDS Output
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Only for training and service purposes
No
Replace L3703
No
Replace IC3703
No
Bad Tuner. Replace Tuner.
No
Replace M star(IC101) or M ain Board.
No
Replace Jack
No
Replace R1713
No
Replace M star(IC101) or M ain Board.
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