Read LG 47LX9500-UA (CHASSIS:LA02R) Service Manual online
13. Trouble shooting - No Audio (all audio source)
Check the TV Speaker Menu
(Menu -> Sound -> TV Speaker)
On
ok
ok
Check Output Signal P8800
1, 2, 3, 4 pin.
Replace Audio AMP IC(IC8801)
ok
No
Check Connector & P8800
Replace connector
if found to be damaged.
ok
No
Check speaker resistance
and connector damage.
Replace speaker.
ok
No
Off
Toggle the Menu
Check AMP IC(IC8801) Power
*20V, 3.3V, 1.8V.
No
Check Regulator IC8800
Check Mstar I2S Output
R8801, R8802, R8803
No
Check signal line.
Or replace BCM( IC900)
Check AUDIO_MASTER_CLK
R8828
No
Replace BCM( IC900) or Main Board.
ok
Check AMP I2C Line
R8804, R8805
No
Check signal line.
Or replace BCM( IC900)
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