Compass Failure; Maintenance Process - Huawei P20 Maintenance Manual

4.7 Compass Failure

4.7.1 Maintenance Process

Compass failure
Does U2604
have cosmetic defects or soldering
Are all the sensors
(photoreceptor, accelerometer,
and gyroscope) on the I2C0
circuit abnormal?
Replace U2601
Because all sensor I2Cs are mounted to the I2C0 circuit, choose a proper network for the test.
2019-6-25
EML-L29V100R001 Advanced Maintenance Manual V2.1
No
issues?
No
No
Huawei Confidential
Yes
Ask PCBA process
engineers to analyze
the cause
Yes
Do any
components on the I2C0
circuit have cosmetic defects or
soldering issues?
No
Is the sensor
power supply normal (C2603)?
Yes
Is the I2C0 signal
normal (J2901)?
Yes
Replace the faulty
sensor
INTERNAL
Replace or re-solder
U2604
Yes
Replace or re-solder
the faulty components
No
If there are no
soldering issues,
replace U1000
No
If there are no
soldering issues,
replace U300
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