LG HB620 - Page 90

4.7.4 Microphone for main MIC
Main Microphone path as below:
MIC → C330, C331 → MSM internal CODEC
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Only for training and service purposes
4. TROUBLE SHOOTING
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Can you scoping some
sound signal at C330,C33
1
NO
YES
YE
S
Start
MIC_BIAS(R702) is 1.8V?
Change the Main Bíd
NO
Make a call
Work well?
END
YE
S
Change the Main Bíd
Change the MIC
Can you scoping some
sound signal at C330,C33
1
NO
YES
YE
S
Start
MIC_BIAS(R702) is 1.8V?
Change the Main Bíd
NO
Make a call
Work well?
END
YE
S
Change the Main Bíd
Change the MIC
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