LG 42PT250B Service Manual page 51

8. HDMI Video Trouble Shooting
Check Signal Format
Is it supported signal?
Y
Check HDMI Cable
Y
Check HDMI Jack
JK801, JK803, JK804
Y
Check I2C Signal
R829/R830
/R848/R849/R862/R863
Y
Maybe Mstar S7LR(IC101)
has problems
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Only for training and service purposes
N
Replace Jack
N
Replace It & Recheck
LGE Internal Use Only