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42LH50YD (CHASSIS:LJ91C) - LG TV Service Manual (repair manual). Page 52

Read LG 42LH50YD (CHASSIS:LJ91C) 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 BCM3556 audio block has 
problems. Replace it
N
Follow procedure HDMI video 
trouble shooting
N
Replace IC601
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