LG -P715 Service Manual page 106

4.13.5 2nd Microphone
MIC Signal: MIC6001 -> FB6005(TP2) -> C2011,C2012 (TP3) MIC_2P of MSM8225
MIC Bias: C2003,C2002 (1.8V) -> MIC6001
C559(TP1) is about 1.8V
Make some sound or voice to MIC
Some sound signal appears at
Some sound signal appears at
Change the U200(MSM7227A-1-AA)
or Change the Main PCB.
LGE Internal Use Only
START
Make a call
Yes
FB900(TP2)?
No
C209(TP3)?
No
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