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