Headset Microphone - LG TU550 Service Manual

4.19 Headset microphone

Headset → C106 → MIC2P(MSM6275)
Change the headset and retry
Sine wave appears at
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Only for training and service purposes
Start
Make a call
NO
EAR_SENSE_N
(R109) is 0V?
Yes
VREG_MSMP is biased
by 2.6V? (R100)
Yes
C106 ?
Yes
Change the Main B'd
4. TROUBLE SHOOTING
OK
END
NO
Change the headset or
SUB board and retry.
NO
Change MAIN board
NO
Change the headset or
SUB board and retry.
- 113 -
YES
NO
LGE Internal Use Only