Huawei P20 - Hall Sensor Failure; Maintenance Process; Maintenance Principle

EML-L29V100R001 Advanced Maintenance Manual V2.1
INTERNAL
2019-6-25
Huawei Confidential
Page 37 of 67
4.8 Hall Sensor Failure
4.8.1 Maintenance Process
Perform cross verification. Is
the sub-board faulty?
Replace the antenna sub-
board
Perform cross verification. Is
the PCBA faulty
Is the power supply of
sensor_1v8 normal?
Replace U1000
Measure the interrupt signal
of the fourth pin of U200 (on
the sub-board)
Replace the SOC (U300)
Yes
No
Yes
No
Yes
4.8.2 Maintenance Principle