LG 42PT250B Service Manual page 47

6. RGB Video Trouble Shooting
Check Signal Format
Is it supported signal?
Y
Check RGB Cable
Y
Check RGB Jack P900
Y
Check RGB Signal
R166,R168,R170
Y
Check Sync Signal
Y
Check EEPROM (IC901)
Y
Maybe Mstar S7LR(IC101)
has problems
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Only for training and service purposes
N
Replace Jack
N
Replace It & Recheck
N
Replace one of R163/R164
& Recheck
N
Replace it or re-burn
& Recheck
LGE Internal Use Only