Microphone Failure; Maintenance Process - Huawei P20 Maintenance Manual
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Also See for P20:
- User manual (149 pages) ,
- Basic manual (141 pages) ,
- User manual (71 pages)
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EML-L29V100R001 Advanced Maintenance Manual V2.1
INTERNAL
4.12 Microphone Failure
4.12.1 Maintenance Process
Microphone failure
Is the failure
rectified after MIC2302 is
No
The PCBA is faulty
replaced?
Yes
Are the
A_MIC2P and A_MIC2N
Yes
circuits normal?
The microphone is
No
faulty. Send it to the
manufacturer for
Is the
analysis
A_MICBIAS2 voltage
normal (C2321)?
Check L2303,
L2304, C2325, and
C2326 in sequence
No
If there are no
soldering issues,
replace U2201
2019-6-25
Huawei Confidential
Page 43 of 67
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