Read LG 42PG3HD-UA (CHASSIS:PU84A) Service Manual online
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Analog TV Audio Trouble Shooting
Check video output
Follow procedure All source audio trouble
shooting
Y
Follow procedure analog TV video
trouble shooting
N
N
Maybe Mstar audio block has problems.
Replace it
Check L400, L402 voltage level 5V
Replace it
N
Y
Check SIF buffer signal
Replace it
N
Y
Check SIF signal
C409
Replace it
N
Y
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