4. TROUBLE SHOOTING
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4.17.4 Main Microphone
MIC Signal: MIC1100 -> R2001,R2002 (TP2) -> C2019,C2018 (TP3) MIC1P of MSM7225A
MIC Bias: MIC_BIAS -> C2005(TP1) -> MIC1100
No
START
Change the main PCB
Make a call
Yes
No
Make some sound or voice to MIC
Yes
C2005(TP1) is about 1.8V?
Some sound signal appears at
R2001, R2002 (TP2)?
Some sound signal appears at
C22019,C2018 (TP3)?
Yes
Work Well?
END
Yes
Change the MIC
No
Change the U200 (MSM7225A) or
Change the Main PCB