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50PM670T-ZA (CHASSIS:PD22C) - LG TV Service Manual (repair manual). Page 62

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Check video output
Y
Follow procedure All source audio 
trouble shooting
N
Y
Check EDID Pull-Up Voltage 
Maybe MTK5369(IC100) audio 
block has problems. Replace it
N
Follow procedure HDMI video 
trouble shooting
N
Replace one 
R604/R606/R618/R620/R619/R621/R
605/R607
& Recheck
N
Check DDC Line 
Replace one 
R614/R615/R616/R617/R627/R629/
R632/R633/R634/R635
& Recheck
Y
13. HDMI Audio Trouble Shooting
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