Read LG 50PM6700-TK (CHASSIS:PA22A) Service Manual online
Check Signal Format
Is it supported signal?
Y
Check RGB JK507
N
Y
Y
Check RGB Cable
Replace Jack
Check RGB Signal
R510/R511/R512
N
Replace It & Recheck
Y
Check Sync Signal
R514/R515
N
Y
Maybe MTK5369(IC100)
has problems
6. RGB Video Trouble Shooting
Replace one of R514/R515
& Recheck`
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