LG 42LG30 Service Manual page 20

AV Video
Check input signal format
Is it supported?
Y
Check AV Cable / S-Video Cable for
damage or open conductors
Y
Check JK600 (Rear)
Check JK602 (Side)
Y
Check signal
C635 (Composite), C634 / C633 (S-Video)
(Rear)
R615 (Composite) (Side)
Y
Check Mstar LVDS output
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Only for training and service purposes
N
Replace Jack
N Check other set.
If no problem, check signal line.
N
Replace Mstar(IC100)
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LGE Internal Use Only