LG P705 Service Manual page 102

4.19.5 2nd Microphone
MIC Signal: MIC900 -> FB900, FB802(TP2) -> C209(TP3) MIC_2P(AUXIP) of MSM7227A-1-AA
MIC Bias: PM8029 HSED_BIAS2 -> MIC900
Make some sound or voice to MIC
Some sound signal appears at
Some sound signal appears at
Change the U200(MSM7227A-1-AA) or
LGE Internal Use Only
START
Make a call
C559(TP1) is about 1.8V?
Yes
FB900(TP2)?
No
C209(TP3)?
No
Change the Main PCB.
No
Change the U501(PM8029) or Change
the Main PCB.
Yes
Change the MIC
Yes
Re-contact or test the new Upper FPCB.
(If It's OK, Change the FPCB)
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4. TROUBLE SHOOTING
Only for training and service purposes