42PG3HD-UA (CHASSIS:PU84A) - LG TV Service Manual (repair manual). Page 37

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HDMI Audio Trouble Shooting
Check video output
Follow procedure All source audio trouble
shooting
Y
Follow procedure HDMI video trouble
shooting
N
N
Maybe Mstar audio block has problems.
Replace it
Check EDID NVRAM (IC801, 802, 804)
Power & I2C Signal (#5, #6)
Replace it or re-download
Y
N
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