Headset Microphone - LG U250 Service Manual

4.20 Headset microphone

Headset → C210/C211 → MIC2P, MIC2N (MSM6245)
Change the headset and retry
Change the Main board
Start
Make a call
NO
HOOK_KEY is detected?
Yes
MICBIAS is biased
by 1.8V?
Yes
Sine wave appears at
C210/C211 ?
Yes
- 115 -
4. TROUBLE SHOOTING
OK
END
YES
NO
Change the MAIN board
NO
Change the MAIN board
NO
Change the headset or
Main board and retry.