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50PZ570B-SB (CHASSIS:PB12A) - LG TV Service Manual (repair manual). Page 80

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Check video output
Y
Follow procedure All source audio 
trouble shooting
N
Y
Re-download EDID data
Maybe BCM35230 audio block has 
problems. Replace it
N
Follow procedure HDMI video 
trouble shooting
N
Replace IC800
N
Check HDMI S/W Power( 3.3V) 
Replace one of L800/L801
& Recheck
Y
13. HDMI Audio Trouble Shooting
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