LG -P715 Service Manual page 102

4.13.4 Main Microphone
MIC Signal: MIC100 -> FB100 (TP2) -> C2013,C2014 (TP3) MIC1P of MSM8225
MIC Bias: MIC_BIAS -> C4050(TP1) -> MIC100
C4050(TP1) is about 1.8V
Make some sound or voice to MIC
Some sound signal appears at
Some sound signal appears at
C2013,C2014(TP3)?
LGE Internal Use Only
START
Make a call
Yes
FB100(TP2)?
Yes
Yes
END
No
Change the Main PCB
No
Change the MIC
No
Change the U2001
(MSM8225 or Change the Main PCB)
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4. TROUBLE SHOOTING
Only for training and service purposes