Huawei P20 - Screen Lock and Unlock

EML-L29V100R001 Advanced Maintenance Manual V2.1
INTERNAL
2019-6-25
Huawei Confidential
Page 33 of 67
4.6 Accelerometer Failure
4.6.1 Maintenance Process
Accelerometer failure
Is the sensor
calibrated using a level
instrument?
Yes
End
Yes
No
No
Calibrate the sensor using a
level instrument
Is the failure rectified
after the calibration?
Does U2602
have cosmetic defects or soldering
issues?
Replace or re-solder U2602
Yes
No
Are all the
sensors (compass, accelerometer,
and gyroscope) on the I2C0 circuit
abnormal?
Replace U2602
Yes
No
Do any
components on the I2C0
circuit have cosmetic defects or
soldering issues?
Replace or re-solder the
faulty components
No
Yes
Is the sensor power
supply normal?
If there are no
soldering issues,
replace U1000
Is the I2C0 signal normal?
If there are no
soldering issues,
replace U300
Replace the faulty
sensor
No
Yes
Yes
No