Main Microphone - LG -E400 Service Manual

4.18.4 Main Microphone

MIC Signal: MIC700 → R704, R705 (TP2) → C15 (TP3) MIC1P of MSM75A
MIC Bias: MIC_BIAS → C9 (TP1) → MIC700
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
C9(TP1) is about 1.8V?
Yes
R704, R705 (TP)?
Yes
C15 (TP3)?
Yes
Work Well?
Yes
END
No
Change the main PCB
No
Change the MIC
No
Change the U00 (MSM75A) or
Change the Main PCB
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4. TROUBLE SHOOTING
Only for training and service purposes