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42PW350R-MA (CHASSIS:PU11A) - LG TV Service Manual (repair manual). Page 68

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Customer Oriented R&D
Breakthrough
13. HDMI Audio Trouble Shooting
Check video output
Y
Follow procedure All source audio 
trouble shooting
N
Y
Re-download EDID data
Maybe Mstar S7R audio block has 
problems.
Replace it
N
Follow procedure HDMI video 
trouble shooting
N
Replace IC801, IC802, IC804
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