Huawei P20 - Faulty Component Description

EML-L29V100R001 Advanced Maintenance Manual V2.1
INTERNAL
2019-6-25
Huawei Confidential
Page 12 of 67
2.4 Faulty Component Description
The following table describes component faults.
C o m p o nent
M aintenance G uid e inEM L-L29V 100R 001A d vanced M aintenance M anual_V 2.0-20180227-原稿.xlsx
No.
Designator
Description
Symptom
Remarks
1
U300
SOC
U300 is the system's main control chip.
If it fails, the symptoms may vary. For
example, the phone cannot be powered
on, the system freezes, the phone
restarts repeatedly, or the phone has
various malfunctions. Replace U300
only if you are sure SOC is faulty.
Replace SOC only
when other
methods do not
work.
2
U300_POP
DDR
Various stability faults may occur. For
example, the phone cannot be powered
on, restarts repeatedly, or freezes.
DDR and SOC are
bound together.
Only if you are
sure that DDR is
defective, replace
DDR.