Headset Microphone - LG U370 Service Manual

4.18 Headset microphone

Headset → C210/C211 → MIC2P, MIC2N (MSM6245)
→ Analog Switch(U401) → Speaker
Make a Call with Equipment
Hook_KEY is detected ?
MICBIAS whether 1.8 V?
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Only for training and service purposes
Start
YES
YES
Check the Voltage of
YES
Sine wave appears at
C210 , C211
YES
Check the Headset or
Connector
4. TROUBLE SHOOTING
NO
Change the Main Board
NO
Change the Main Board
NO
Change the Headset
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LGE Internal Use Only