LG P705 - Page 102

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