LG LG-P715 - Page 102

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