Gps Failure; Maintenance Process - Huawei P20 Maintenance Manual

4.15 GPS Failure

4.15.1 Maintenance Process

Yes
Replace
the rear
cover
No
Re-assemble
the antenna
If the
Yes
assembly is
normal,
replace the
rear cover
2019-6-25
EML-L29V100R001 Advanced Maintenance Manual V2.1
GPS failure
No
Perform cross
verification. Is the PCBA
Is the
GPS antenna
missing?
Is the GPS
antenna properly
assembled?
Yes
Is the GPS
antenna spring in good
contact with the
antenna?
No
Replace the rear cover
Yes
faulty?
Is the
appearance of GPS chip,
crystal oscillator clock, and components
on the GPS antenna circuit
normal?
No
Does the
soldering of the chip and crystal
oscillator have problems under an
X-ray machine?
No
Is GPS_EN normal?
No
Does TCXO5601 have output?
No
Is CLK32_GPS normal?
No
Is the power supply of
LB5601 normal?
No
Is the power
of each node on the circuit
normal?
Replace the PCBA
Huawei Confidential
INTERNAL
Replace components
Yes
with abnormal
Yes
Replace corresponding
Yes
If there are no soldering
issues, replace U300
Yes
Replace TCXO5601
Yes
If there are no soldering
issues, replace U1000
Yes
If there are no soldering
issues, replace U5602
Yes
Check the circuit for
faulty components
No
appearance
components
Page 49 of 67