Read LG 55LM5800 / 55LM5850 (CHASSIS:LA21B) Service Manual online
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4. AV Video
5. Component Video
Check input signal format.
Is it supported?
Check AV Cable for damage
for damage or open conductor
Check JK1601, CVBS Signal Line
L1603
ok
ok
ok
No
Replace Jack
ok
Check CVBS_DET Signal
Replace R1600
No
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board
.
No
Check input signal format.
Is it supported?
Check Component Cable
for damage or open conductor.
Check JK1603 or JK1602 or JK1601
Y/PB/PR signal Line
ok
ok
ok
No
Replace Jack
Check COMP_DET Signal
Replace R1612 or R1613
No
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board
.
ok
No
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