LG 42PM4700 Service Manual page 47

6. RGB Video Trouble Shooting
Check Signal Format
Is it supported signal?
Y
Check RGB Cable
Y
Check RGB JK507
Y
Check RGB Signal
R510/R511/R512
Y
Check Sync Signal
R514/R515
Y
Maybe MTK5369(IC100)
has problems
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Only for training and service purposes
N
Replace Jack
N
Replace It & Recheck
N
Replace one of R514/R515
& Recheck`
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