Proximity/Ambient Light Sensor Failure; Maintenance Process - Huawei P20 Maintenance Manual
Hide thumbs
Also See for P20:
- User manual (149 pages) ,
- Basic manual (141 pages) ,
- User manual (71 pages)
Table of Contents
Advertisement
4.5 Proximity/Ambient Light Sensor Failure
4.5.1 Maintenance Process
Light sensor failure
(automatic MMI)
Is it an l0005
failure?
Is the
touchscreen
transmittance
low?
Yes
Replace the front
cover assembly
2019-6-25
EML-L29V100R001 Advanced Maintenance Manual V2.1
No
Check whether components on the I2C0
(C2903, C2904) circuit are defective
Huawei Confidential
Light sensor failure
(manual MMI)
Yes
Do the
PCBA and front cover
spring contact
properly?
Yes
Perform
cross verification. Is
the front cover assembly
normal?
No
Perform cross
verification. Is the PCBA
normal?
Yes
Are power
VOUT18(C2901) and
VOUT24(C2902)
normal?
Yes
INTERNAL
Check whether the
No
spring is damaged
Replace the front
Yes
cover
No
Replace U1000
Page 31 of 67
Advertisement
Table of Contents
