Main Microphone - LG U250 Service Manual

4.19 Main microphone

MIC400 → MIC1P, MIC1N (MSM6245)
Start
Make a call
MIC_BIAS(C416)
is 1.8V
Make sound to MIC
Sine wave appears at
C418/C419?
Change the Main board
NO
YES
NO
YES
NO
- 113 -
4. TROUBLE SHOOTING
Change main board
Change the MIC
Work well?
YES
END