Main Microphone - LG -E405 Service Manual

4.19.4 Main Microphone

MIC Signal: MIC7001 -> FB7001, FB7000 (TP2) -> C2015 (TP3) MIC_1P of MSM7225A
MIC Bias: MIC_BIAS-> C2003 (TP1)-> MIC7001
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
FB7000, FB7001 (TP2)?
Yes
C2015 (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