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Level 3 Repair
8-12
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8-3-4. Microphone Part
Microphone does not work
Check the related circuit
Yes
END
Yes
Replace PBA
MIC_BIAS1_EN = 1.8V?
(TP: U520 Pin 3)
No
Yes
Check and re-solder U520
MIC_BIAS1_2.1V = 2.1V?
(TP: C521)
No
Yes
Re-solder MIC520
Is it work?
Yes
No