Read LG 42PG20-UA (CHASSIS:PU84A) Service Manual online
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TROUBLE SHOOTING GUIDE
Component Video Trouble Shooting
Check signal format
Is it supported?
Check signal
C833, C834, C835, C838, C839, C840
Replace it.
Check signal IC601 output
R631, R632, R633
Y
Y
N
Check JK602 / JK603
Replace connector
Y
N
Y
Replace it
N
Maybe Mstar(IC100) has problems
Y
Check Component Cable
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