LG D690 Service Manual page 71

LGE Internal Use Only
START
Check the MIC signal by Loopback test
Reconnect the main PCB
No
Change theearjack socket(J6100)
No
Change the MT6323(U4100).
Is voice signal OK?
No
Change the main PCB
Yes
Yes
Yes
- 71 - Copyright © 2014 LG Electronics. Inc. All right reserved.
3. TROUBLE SHOOTING
END
END
END
Only for training and service purposes