Read LG 39LN5400 / 39LN542Y (CHASSIS:LB36B) Service Manual online
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2. Digital/Analog TV Video
3. AV Video
Check RF Cable & Signal
Check Tuner 3.3V Power
L3703
Replace L3703.
Check Tuner 1.8V Power
IC3703 2 pin : 1.8V
Check IF_P/N Signal
TU3700 10/11 Pin
Replace IC3703.
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
ok
ok
ok
ok
No
No
No
No
Bad Tuner. Replace Tuner.
Check input signal format.
Is it supported?
Check AV Cable for damage
for damage or open conductor.
Check JK1702, CVBS Signal Line
R1722
ok
ok
ok
No
Replace Jack.
ok
Check CVBS_DET Signal.
Replace R1713.
No
Check Mstar LVDS Output.
Replace Mstar(IC101) or Main Board.
No
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