Read LG 22LS3500 / 22LS3700 (CHASSIS:LB21A) Service Manual online
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7. All Source Audio
Check the TV Speaker Menu
(Menu -> Sound -> TV Speaker)
On
ok
ok
Check Output Signal P501
Pin 1, 2, 3, 4
Replace Audio AMP IC (IC501)
ok
No
Check Connector & P501
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(IC501) Power
24V, 3.3V
No
Replace Amp IC (IC501)
Check Mstar I2S Output
IC501 Pin 9, 10, 11
No
Check signal line. Or replace Mstar (IC101)
Check Mstar AUDIO_MASTER_CLK
R148
No
Replace Mstar (IC101) or Main Board
.
ok
Check AMP I2C Line
R140, R141
No
Check signal line. Or replace Mstar (IC101)
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