LG LG-E410 - Page 97

4. TROUBLE SHOOTING
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4.18.4 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
No
START
Change the main PCB
Make a call
Yes
No
Make some sound or voice to MIC
Yes
C2003(TP1) is about 1.8V?
Some sound signal appears at
R7007, R7008 (TP2)?
Some sound signal appears at
C2015,C2014 (TP3)?
Yes
Work Well?
END
Change the MIC
No
Change the U2000 (MSM7225A) or
Change the Main PCB