LG 32LN54 series Service Manual page 14

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 JK1702, CVBS Signal Line
R1722
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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