Read LG 42LB7DF (CHASSIS:LJ81A) Service Manual online
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Check video output
Follow procedure All source audio trouble
shooting
Y
Follow procedure HDMI video trouble
shooting
N
N
Maybe BCM3553 audio block has
problems. Replace it
Check EDID NVRAM (IC602, 603, 604)
Power & I2C Signal (#5, #6)
Replace it or
redownload
Y
N
TROUBLESHOOTING
13. HDMI Audio
13-2. Troubleshooting
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