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42PT350B-SG (CHASSIS:PB12K) - LG TV Service Manual (repair manual). Page 61

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13. HDMI Audio Trouble Shooting
Check video output
Y
Follow procedure All source audio 
trouble shooting
N
Y
Re-download EDID data
Maybe Mstar S7LR audio block has 
problems.
Replace it
N
Follow procedure HDMI video 
trouble shooting
N
Replace IC801, IC802, IC804
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