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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
BL20
51/53
Start
MIC_BIAS(C2)
is 1.8V?
Change the Main board
NO
Make a call
Change the MIC
NO
YES
Change the Main board
Make sound to MIC
Work well?
END
YES
NO
4.19 Main microphone
MIC1
Æ
MIC_BIAS(C2)
Æ
MIC1P(C3)
Æ
QSC6270
YES
Sine wave appears at
C3?