LG -E435 Service Manual page 94

4.19.4 Main Microphone
MIC Signal: MIC500 -> R7013, R7014 (TP2) -> R7007, R7008 -> 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
LGE Internal Use Only
START
Make a call
C2003(TP1) is about 1.8V?
Yes
Some sound signal appears at
R7013, R7014 (TP2)?
Yes
Some sound signal appears at
C2015,C2014 (TP3)?
Yes
Work Well?
Yes
END
No
Change the main PCB
No
Change the MIC
No
Change the U2000 (MSM7225A) or
Change the Main PCB
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4. TROUBLE SHOOTING
Only for training and service purposes