LG LG-P715 - Page 106

4. TROUBLE SHOOTING
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4.13.5 2nd Microphone
MIC Signal: MIC6001 -> FB6005(TP2) -> C2011,C2012 (TP3) MIC_2P of MSM8225
MIC Bias: C2003,C2002 (1.8V) -> MIC6001
Change the U501(PM8029) or
Change the Main PCB
Change the MIC
Re-contact or test the new Upper FPCB
(If it’s OK, Change the FPCB)
Make a call
Make some sound or voice to MIC
Some sound signal appears at
FB900(TP2)?
Some sound signal appears at
C209(TP3)?
C559(TP1) is about 1.8V
No
No
No
Yes
Yes
Yes
START
Change the U200(MSM7227A-1-AA)
or Change the Main PCB.