Main Microphone - LG TU550 Service Manual

4.18 Main microphone

U303 → C222 → MIC1P(MSM6275)
Start
Make a call
MIC_BIAS(C217 or C218)
is 1.8V
Make sound to MIC
Sine wave appears at
C222 ?
Change the Main board
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Only for training and service purposes
NO
YES
NO
YES
NO
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4. TROUBLE SHOOTING
Change main board
Change the MIC
YES
Work well?
END
LGE Internal Use Only