LG LG-H815 - Sub MIC

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reserved. Only training and service purposes
LGE Internal Use Only
3. TROUBLE SHOOTING
3.19.4 Audio - Sub MIC
Circuit Diagram
Image
Check parts about
MIC Output(FB6921)
works well ?
Start
Check the MIC signal by test mode
or Voice recording.
Check MIC-
hole and mesh
and MIC- Rubber
Voice Signal OK
?
Check parts about
MIC Bias VA6928
works well
?
No
Yes
No
Yes
No
Yes
End
Change Main Board
A Sub MIC is located at the bottom of PCB. It operates in case of voice call (handset noise suppression on/
Speaker Phone noise suppression on), camcorder recording (zooming)
Checking Flow
MIC Rubber
MIC Mash
PCB TOP
Folder
FB6921
VA6928
55