LG 22LS3700 Service Manual page 19

7. All Source Audio
Check the TV Speaker Menu
(Menu -> Sound -> TV Speaker)
On
Check AMP IC(IC501) Power
24V, 3.3V
ok
Check Mstar AUDIO_MASTER_CLK
R148
ok
Check AMP I2C Line
R140, R141
ok
Check Mstar I2S Output
IC501 Pin 9, 10, 11
ok
Check Output Signal P501
Pin 1, 2, 3, 4
ok
Check Connector & P501
ok
Check speaker resistance
and connector damage.
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Only for training and service purposes
Off
Toggle the Menu
No
Replace Amp IC (IC501)
No
Replace Mstar (IC101) or Main Board.
No
Check signal line. Or replace Mstar (IC101)
No
Check signal line. Or replace Mstar (IC101)
No
Replace Audio AMP IC (IC501)
No
Replace connector
if found to be damaged.
No
Replace speaker.
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LGE Internal Use Only