Read LG 60PT100C-WA / 60PT100N (CHASSIS:PC11A) Service Manual online
Check Signal Format
Is it supported signal?
Y
Check HDMI Jack
JK801
N
Y
Y
Check HDMI Cable
Replace Jack
Check I2C Signal
R1801/R1802
N
Replace It & Recheck
Y
Maybe Mstar S7(IC101)
has problems
9-10. HDMI2 Video Trouble Shooting
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