LG Electronics 42CS669C-ZD service manual All Source Audio, ok No

9. All Source Audio

Check the TV Speaker Menu.	Off
(Menu -> Sound -> TV Speaker)
On
	No
Check AMP IC(IC501) Power
24V or 20V or 15V, 3.3V

ok

No

Check Mstar AUDIO_MASTER_CLK

R148.

ok

Check AMP I2C Line	No
R140, R141.
ok
	No
Check Mstar I2S Output
IC501 9,10,11 Pin.
ok
	No
Check Output Signal P501
1, 2, 3, 4 pin.

ok

No

Check Connector & P501.

ok

Toggle the Menu.

Replace Amp IC(IC501).

Replace Mstar(IC101) or Main Board.

Check signal line. Or replace Mstar(IC101).

Check signal line. Or replace Mstar(IC101).

Replace Audio AMP IC(IC501).

Replace connector.

if found to be damaged.

Check speaker resistance and connector damage.

No

Replace speaker.

Copyright ©2012 LG Electronics. Inc. All right reserved.	- 19 -	LGE Internal Use Only
Only for training and service purposes