42LV3500-DG (CHASSIS:LT01M) - LG TV Service Manual (repair manual). Page 63

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8. All Source Audio
Check the TV Speaker Menu
(Menu -> Sound -> TV Speaker)
On
ok
ok
Check Output Signal P501
1, 2, 3, 4 pin.
Replace Audio AMP IC(IC501)
ok
No
Check Speaker cable
Replace connector
if found to be damaged.
ok
No
Check speaker.
Replace speaker if found to be damaged.
ok
No
Off
Toggle the Menu
Check AMP IC(IC501) Power
24V(or 20V), 3.3V, 1.8V.
No
Check Regulator IC404(1.8V), IC405(3.3V), POWER B/D(24V)
Check Mstar I2S Output
R503, R504, R505
No
Check signal line. Or replace Mstar(IC101) or IC501
Check Mstar AUDIO_MASTER_CLK
R148
No
Replace Mstar(IC101) or Main Board.
ok
Check AMP I2C Line
R506, R507
No
Check signal line. Or replace Mstar(IC101) or IC501
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