LG KS20 - Headset Microphone

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4. TROUBLE SHOOTING
4.21 Headset microphone
HS MIC (18 pin Connector) → C105 → MIC2P(MSM7200)
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Only for training and service purposes
Start
nEAR_DET
(C312) is 0V?
Yes
END
Make a call
Change the MAIN board
VMIC_BIAS2 is biased
by 2.6V? (R301)
END
Yes
OK
NO
NO
NO
Change the headset and retry
YES
Change MAIN board
Sine wave appears at
C105 ?
Change the headset or
Main board and retry.
NO
Yes