Read LG 60LN54XX / 60LN5400 / 60LN5420 / 60LN542Y (CHASSIS:LB31F / 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 URSA5 LVDS Output
Replace URSA5(IC6101) or Main Board.
ok
No
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
Check URSA5 LVDS Output
Replace URSA5(IC6101) or Main Board.
ok
No
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