LG CU920 - Main Microphone Functionality Check

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4. TROUBLE SHOOTING
4.21 Headset microphone
Headset → CN801 (MMI connector) → C801 → MIC2P(MSM6281)
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Start
EAR_SENSE_N
(D802) is 0V?
Yes
END
Make a call
Change the MAIN board
MICBIAS is b iased
by 1.8V? (FB800)
Change the Main boa rd
Yes
OK
NO
NO
NO
Change th e head set an d ret ry
YES
Change MAIN board
Sine wave appears at
C801?
Change the head set o r
Main boa rd a nd retry .
NO
Yes