Read LG 42LD550 (CHASSIS:LA02B) Service Manual online
4. AV Video
Check input signal format.
Is it supported?
Check AV Cable for damage
for damage or open conductor
Check JK100 , JK8500
CVBS Signal Line
R105 , R8503
ok
ok
ok
No
Replace Jack
5. Component Video
Check input signal format.
Is it supported?
Check Component Cable
for damage or open conductor.
Check JK100
Y/PB/PR signal Line
ok
ok
ok
No
Replace Jack
ok
Check CVBS_DET Signal
Replace R113 or R8504
No
Check COMP_DET Signal
Replace R119 or R129
No
ok
No
Check FRC and BCM LVDS Output
Replace Mstar(IC9001) or BCM( IC900)
or Main Board.
or Main Board.
No
Check FRC and BCM LVDS Output
Replace Mstar(IC9001) or BCM( IC900)
or Main Board.
or Main Board.
Click on the first or last page to see other 42LD550 (CHASSIS:LA02B) service manuals if exist.