LG CU920 - Speaker Phone Audio Path Troubleshooting

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4. TROUBLE SHOOTING
4.20 Main microphone
MIC101 → C936 MIC1P(MSM6281)
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Only for training and service purposes
Start
Change main board
NO
Make a call
Change the MIC
NO
YES
Change the Main boa rd
Make sound t o MIC
Work w ell?
END
YES
NO
YES
Sine wave appears at
C936?
MIC_BIAS(C937)
is 1.8V