LG HB620 Service Manual page 90

4.7.4 Microphone for main MIC
Main Microphone path as below:
MIC → C330, C331 →
MIC_BIAS(R702) is 1.8V? MIC_BIAS(R702) is 1.8V?
sound signal at C330,C331 sound signal at C330,C331
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Only for training and service purposes
MSM internal CODEC
Start Start
Make a call Make a call
NO NO
YES YES
Can you scoping some Can you scoping some
YES YES
Change the MIC Change the MIC
YES YES
Work well? Work well?
END END
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4. TROUBLE SHOOTING
Change the Main Bíd Change the Main Bíd
NO NO
Change the Main Bíd Change the Main Bíd
LGE Internal Use Only