Main Mic Trouble Shooting - LG -D855 Service Manual

3.13.4 Main MIC Trouble Shooting

A Main MIC is located at the bottom of PCB
It operates in case of voice call (handset), voice recording, camcorder recording
LGE Internal Use Only
START
Check the Mic signal by test mode
or Voice recording.
1. Check Mic-
hole and mesh and Mic- Rubber
Voice Signal OK?
No
2. Check parts about Mic Bias(1.77V)
(VA6923) works well ?
No
3. Check parts about Mic Output
(FB6920) works well ?
No
Change Main Board
End
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3. TROUBLE SHOOTING
Yes
Yes
Yes
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