LG E475F Service Manual page 89

3.18.4 Main Microphone
MIC Signal: MIC500 -> R7007, R7008(TP2) -> C2015, C2014 (TP3) -> MIC_1P / MIC_1N of MSM7225A-0-AB
MIC Bias: MIC_BIAS -> C2003 (TP1) -> MIC500
Make some sound or voice to MIC
Some sound signal appears at
Some sound signal appears at
LGE Internal Use Only
START
Make a call
C2003(TP1) is about 1.8V?
Yes
R7007, R7008 (TP2)?
Yes
C2015,C2014 (TP3)?
Yes
Work Well?
END
No
Change the main PCB
No
Change the MIC
No
Change the U2000 (MSM7225A) or
Change the Main PCB
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3. TROUBLE SHOOTING
Only for training and service purposes