Huawei P20 - Merging Third-party App Contacts

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