Read LG 42PG20-UA (CHASSIS:PU84A) Service Manual online
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TROUBLE SHOOTING GUIDE
RGB Video Trouble Shooting
Check signal format
Is it supported?
Check signal, Hsync, Vsync
R673, R674
Replace it.
Check signal
R678, R679, R680
Y
Y
N
Check JK607
Replace connector
Y
N
Y
Replace it.
N
Maybe Mstar(IC100) has problems
Y
Check Signal
C116, C124, C126
Replace it
N
Check RGB Cable
Y
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