Huawei P20 - Page 14

EML-L29V100R001 Advanced Maintenance Manual V2.1
INTERNAL
2019-6-25
Huawei Confidential
Page 14 of 67
No.
Designator
Description
Symptom
Remarks
18
J2002
Front camera
connector
The front camera malfunctions.
19
U2101
Super switch
There are charging failures and power
leakage that lead to power-on failures.
There is no port, and the OTG and DP
headset cannot be detected.
Because there are
too many
integrated
functions, the
interface charging
failures are
coupled easily.
Check other
components
related to the
faulty function
first.
20
U2102
DP two-way
transfer switch
The DP cannot be detected, or only one
side can be detected. The analog
headset cannot be detected.
21
U2201
Audio Codec
chip
Various audio faults may occur.
22
U2301
Motor drive chip
There are failures. For example, the
motor does not vibrate or vibrates
continuously or abnormally.
23
MIC2301
Secondary
microphone
The microphone fails, especially in the
hands-free mode.
24
U2501
Speaker smart
PA
Faults, such as noise or no sound from
the speaker, occur.
25
U2505
BST5V power
supply chip
There is an NFC failure, or
SuperCharge cannot be detected.
26
U2601/U2604
Compass
The compass does not work properly.
27
U2602
Accelerometer
and gyroscope
sensor
Functions, such as step counting,
knuckle screenshot, and auto screen
rotating, are abnormal.
28
U2603
Laser
range-finding
sensor
The rear camera focuses slowly.
29
LED2601
Tricolor LED
The indicator does not work.
30
U2701
Infrared control
analog switch
The infrared function fails.
31
J2802
Dual SIM card
tray
SIM cards cannot be detected.
MicroSD cards are
not supported.
32
J2901
Main FPC
connector
The phone cannot be charged, the
speaker fails, the motor fails, the
microphone fails, smart cover mode,
Check the
connection of
fastened points or