LG D686 Service Manual page 89

3.8.4 Main Mic
Main Mic located on Lower FPCB.
It's operating voice call(except speakerphone), voice recording, camcorder recording
LGE Internal Use Only
START
Check the Mic signal by test mode
or Voice recording.
Check Mic hole & rubber to
make the voice signal?
No
Reconnect or change FPCB connector.
Voice signal OK?
No
Check parts about Mic Bias
Mic works well?
No
Change MIC10000 or MT6577(U201).
Mic works well?
No
Change Main Board
END
Yes
Yes
Yes
Yes
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3. TROUBLE SHOOTING
Only for training and service purposes