Huawei P20 Maintenance Manual

EML-L29V100R001 Advanced Maintenance Manual V2.1
INTERNAL
2019-6-25
Huawei Confidential
Page 51 of 67
4.16 RF Failure (CDMA)
4.16.1 Maintenance Process (Transmission)
CDMA RF transmission
failure
Is the failure
rectified after the related circuit is
replaced?
Are the
wired specifications
normal?
Is the RF PA power
supply normal?
Check whether the RF
connection cable is normal
and whether the antenna
spring is in good contact
End
Replace U3202
Re-solder or replace
U3401. If the signals are
still abnormal, replace
U3301
End
Yes
Yes
No
No
Yes
No
No
Yes
Yes
No
Replace U3802
Replace Z3801. If the issue
persists, replace J3802
No
Yes
Is the
failure rectified after the
software is updated to the latest
version?
Spot-check the
output RF signals of U3401
based on the non-signaling transmission of the
frequency band. Are the signals
normal?

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