Motor Failure; Maintenance Process - Huawei P20 Maintenance Manual

4.9 Motor Failure

4.9.1 Maintenance Process

motor and motor
cables damaged or
Perform cross verification
for the motor and PCBA to
locate the faulty component
The motor
is faulty
Fail
Send the
motor to the
component
team or the
supplier for
analysis
2019-6-25
EML-L29V100R001 Advanced Maintenance Manual V2.1
Motor
failure
Are the
Fail
broken?
Pass
The PCBA
is faulty
Use a
microscope for
the check. Does the motor
circuit have cosmetic
defects?
Pass
Is the
voltage at both ends
of the motor
1.8 V?
Fail
If there are no
soldering issues,
replace U2301
Huawei Confidential
The motor or motor
cables are damaged,
dirty, or poorly
soldered, causing
contact problems
Fail
Are components
missing or
deviated?
INTERNAL
Ask PCBA
process engineers
to locate the cause
Page 38 of 67