4. TROUBLE SHOOTING
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4.19.4 Main Microphone
MIC Signal: MIC7001 -> FB7001, FB7000 (TP2) -> C2015 (TP3) MIC_1P of MSM7225A
MIC Bias: MIC_BIAS-> C2003 (TP1)-> MIC7001
No
START
Change the main PCB
Make a call
Yes
No
Make some sound or voice to MIC
Yes
C2003(TP1) is about 1.8V?
Some sound signal appears at
FB7000, FB7001 (TP2)?
Some sound signal appears at
C2015 (TP3)?
Yes
Work Well?
END
Yes
Change the MIC
No
Change the U2000 (MSM7225A) or
Change the Main PCB