LG -D175F Service Manual page 126

3.8.3 Main Mic Trouble Shooting
It's operating voice call(including speaker phone), voice recording and camcorder recording.
LGE Internal Use Only
START
Check the Mic signal by test mode or Voice
recording.
Check a Mic hole & rubber to
make the voice signal?
Check the parts about Mic Bias.
Mic works well?
Reconnect or change Mic(MIC6921).
Voice signal OK?
Change MSM8210(U2100)
Mic works well?
Change the Main Board
END
- 126 -
3. TROUBLE SHOOTING
Yes
No
Yes
No
Yes
No
Yes
No
Copyright © 2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes