Main Microphone - LG GU280 Service Manual

4.19 Main microphone

MIC501 MIC_BIAS(C510)
Make a call
MIC_BIAS(C510)
is 1.8V?
Make sound to MIC
Sine wave appears at
C512?
Change the Main board
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Only for training and service purposes
MIC1P(C512) QSC6240
Start
NO
YES
NO
YES
NO
Change the Main board
Change the MIC
Work well?
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4. TROUBLE SHOOTING
YES
END
LGE Internal Use Only