Headset Microphone - LG U970 Service Manual

4.21 Headset microphone

Headset → C210 → MIC2P(MSM6280)
Change the headset and retry
Change the Main board
Start
Make a call
NO
EAR_SENSE_N
(VA502) is 0V?
Yes
MICBIAS is biased
by 1.8V? (R303)
Yes
Sine wave appears at
C210 ?
Yes
- 123 -
4. TROUBLE SHOOTING
OK
END
YES
NO
Change the MAIN board
NO
Change MAIN board
NO
Change the headset or
Main board and retry.