LG P705 - Main Microphone

4. TROUBLE SHOOTING
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Only for training and service purposes
LGE Internal Use Only
4.19.4 Main Microphone
MIC Signal: MIC800 -> FB800, FB802(TP2) -> C211(TP3) MIC_1P of MSM7227A-1-AA
MIC Bias: MSM7227A-1-AA MIC_BIAS -> MIC800
No
START
Change the U200(MSM7227A-1-AA) or
change the Main PCB.
Make a call
Yes
Yes
Make some sound or voice to MIC
No
C202, C201, C200(TP1) is
about 1.8bV?
Some sound signal appears at
FB800, FB802(TP2)?
Some sound signal appears at
C210, C211(TP3)?
No
Change the U200(MSM7227A-1-AA) or
Change the Main PCB.
Change the MIC
Yes
Re-contact or test the new lower
FPCB.(If It’s OK, Change the FPCB)