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50PT490B-SA, 50PT490B-SD (CHASSIS:PB11K) - LG TV Service Manual (repair manual). Page 68

Read LG 50PT490B-SA / 50PT490B-SD (CHASSIS:PB11K) Service Manual online

13. HDMI Audio Trouble Shooting
Check video output
Y
Follow procedure All source audio 
trouble shooting
N
Y
Re-download EDID data
Maybe Mstar S7 audio block has 
problems. Replace it
N
Follow procedure HDMI video 
trouble shooting
N
Replace IC802, IC804
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