Read LG 42LG70YD (CHASSIS:LJ83A) Service Manual online
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Check signal format
Is it supported?
Check signal, Hsync, Vsync
C745, C746, C747, R839, R843
Replace it.
Check signal
R729, R730, R731
Y
Y
N
Check P701
Replace connector
Y
N
Y
Replace it
N
Maybe BCM3553(2)(IC100) has
problems
Check L703 Voltage Level 9V
Y
Replace L703 / Q701 / Q703 / Q704
N
Check Signal
C635, C636, C637
Y
Replace it
N
Check RGB Cable
Y
6. RGB Video
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