4. TROUBLE SHOOTING
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4.18.4 Main Microphone
MIC Signal: MIC700 → R704, R705 (TP2) → C215 (TP3) MIC1P of MSM7225A
MIC Bias: MIC_BIAS → C229 (TP1) → MIC700
No
START
Change the main PCB
Make a call
Yes
No
Make some sound or voice to MIC
Yes
C229(TP1) is about 1.8V?
Some sound signal appears at
R704, R705 (TP2)?
Some sound signal appears at
C215 (TP3)?
Yes
Work Well?
END
Yes
Change the MIC
No
Change the U200 (MSM7225A) or
Change the Main PCB
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