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50PT490-UC (CHASSIS:PU11L) - LG TV Service Manual (repair manual). Page 58

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8. HDMI Video Trouble Shooting
Check Signal Format
Is it supported signal?
Y
Check HDMI Jack
JK801, JK803, JK804
N
Y
Y
Check HDMI Cable
Replace Jack
Check I2C Signal
R829/R830
/R848/R849/R862/R863
N
Replace It & Recheck
Y
Maybe Mstar S7R(IC101)
has problems
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