Huawei P20 Maintenance Manual

EML-L29V100R001 Advanced Maintenance Manual V2.1
INTERNAL
2019-6-25
Huawei Confidential
Page 47 of 67
4.14 Wi-Fi and Bluetooth Failure
4.14.1 Maintenance Process
Wi-Fi failure (found in MT)
during phone assembly
Perform cross
verification. Is the PCBA
faulty?
No
Yes
Is the coaxial
cable damaged or
missing?
No
Yes
Re-fasten, replace, or
re-assemble the
coaxial cable
The phone is
incorrectly assembled
in the production line.
Ask the PQE to take
corrective measures
Replace the
front cover
Use the
tweezers to
install the edge
connector of
the antenna
Yes
No
Yes
Is the
Wi-Fi antenna
missing?
Is the edge
connector of the Wi-Fi
antenna raised or not in
position?
No
Are there
obvious traces
of pressing on the edge
connector of the
Wi-Fi
antenna?
No
The antenna pins are
too low. Use the
tweezers to adjust the
antenna pins
Replace the front
cover
Yes
Is the
resistance between
the edge connector and the
spring attached over
2 ohms?
Yes
No
Replace the
front cover
Wi-Fi failure (found
in BC) during PCBA
testing
Is the
failure rectified after
the WL_EN is
enabled?
Yes
No
No
Yes
Is the
Wi-Fi chip clock
normal?
Is the power
supply normal?
Yes
Is the power
of nodes in the Wi-Fi
circuit normal?
Yes
If there are no
soldering issues,
replace U300
If there are no
soldering issues,
replace U5100
If there are no
soldering issues,
replace U5100
No
No
Check the circuit for
faulty components
4.14.2 Maintenance Principle
Test Point
Network
Normal Standard
LB5201
VOUT_HLDO
1.2 V
LB5204
VOUT_LNLDO_1
1.8 V
C5215
VOUT_PA3P3
3.3 V

Huawei P20 Specifications

General

Panel type	TFT
Screen shape	Flat
Pixel density	428 ppi
Second display	No
Display diagonal	5.8 \
Touch technology	Multi-touch
Touchscreen type	Capacitive
Display resolution	2244 x 1080 pixels
Native aspect ratio	19:9
Rounded display corners	Yes
Display number of colors	16 million colors
Processor cores	4
Processor family	Hi-Silicon
Processor frequency	2.36 GHz
Coprocessor frequency	1.8 GHz
Processor architecture	ARM Cortex-A73
Coprocessor architecture	ARM Cortex-A53
RAM capacity	4 GB
Compatible memory cards	Not supported
Internal storage capacity	128 GB
Flash type	LED
Rear camera type	Dual camera
Front camera type	Single camera
Video recording modes	1080p, 2160p
Rear camera aperture number	1.8
Front camera aperture number	2
Rear camera resolution (numeric)	12 MP
Front camera resolution (numeric)	24 MP
Second rear camera aperture number	1.6
Second rear camera resolution (numeric)	20 MP
4G standard	LTE
2G standards	GSM
3G standards	WCDMA
SIM card type	NanoSIM
Wi-Fi standards	802.11a, Wi-Fi 5 (802.11ac), 802.11b, 802.11g, Wi-Fi 4 (802.11n)
Bluetooth version	4.2
Bluetooth profiles	A2DP, APT-X
SIM card capability	-
Mobile network generation	4G
Subscription type	No subscription
USB version	3.2 Gen 1 (3.1 Gen 1)
USB connector type	USB Type-C
HDMI ports quantity	0
Multimedia Messaging Service (MMS)	Multimedia Messaging Service (MMS) is a standard way to send messages that include multimedia content to and from a mobile phone over a cellular network
Form factor	Bar
Product color	Blue
Themes	Wallpapers
Graphics card	Mali-G72 MP12
Personalization	Icons, Menu, Shortcuts
Personal info management (PIM)	Alarm clock, Calculator, Calendar, Notes
Speakers	stereo
Audio formats supported	3GP, AAC, APE, FLAC, MIDI, MP3, OGG, WAV
Video formats supported	3G2, 3GP, ASF, H.264, MKV, MP4, WEBM
Platform	Android
Operating system installed	Android 8.1
Talk time (3G)	- h
Battery capacity	3400 mAh
Battery recharge time	1.5 h
Interface adapters included	USB Type-C - 3.5mm

Weight and Dimensions

Depth	7.65 mm
Width	70.8 mm
Height	149.1 mm
Weight	165 g