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Main Microphone - LG U970 Service Manual

Lg u970/ku970 cell phone service manual
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4.20 Main microphone

MIC800 → CN700 → CN601 → C212 → MIC1P(MSM6280)
Start
Make a call
MIC_BIAS(C520)
is 1.8V
Make sound to MIC
Sine wave appears at
R507?
Change the Main board
NO
YES
NO
YES
NO
- 121 -
4. TROUBLE SHOOTING
Change main board
Change the MIC
YES
Work well?
END

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