Headset Microphone - LG GU280 Service Manual

4.20 Headset microphone

Headset CN401 (u USB connector)
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
IC401(MUIC)
Start
Insert Headset & Make a call
R414 is 1.8V ?
Yes
Sine wave appears at
C406?
Yes
Change the MAIN board
MIC2P(C406) QSC6240
NO
Change the MAIN board
Change the MUIC
NO
Check the MUIC
Change the Headset
Change the MAIN board
- 83 -
4. TROUBLE SHOOTING
LGE Internal Use Only