Read LG 60LS5700 / 60LS5750 / 60LS579C (CHASSIS:LA22E) Service Manual online
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8. All Source Audio
Check the TV Speaker Menu
(Menu -> Sound -> TV Speaker)
On
ok
ok
Check Output Signal P5400
1, 2, 3, 4 pin.
Replace Audio AMP IC(IC5400)
ok
No
Check Connector & P5400
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(IC5400) Power
24V, 3.3V
No
Replace Amp IC(IC5400)
Check Mstar I2S Output
IC5400 9,10,11 Pin
No
Check signal line. Or replace LGE2112(IC105)
Check Mstar AUDIO_MASTER_CLK
R368
No
Replace LGE2112(IC105) or Main Board
ok
Check AMP I2C Line
R5402,R5403
No
Check signal line. Or replace LGE2112(IC105)
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