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Huawei P20 Maintenance Manual

Huawei P20
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EML-L29V100R001 Advanced Maintenance Manual V2.1
INTERNAL
2019-6-25
Page 25 of 67
4.2 SIM Card Detection Failure
4.2.1 Maintenance Process
SIM card detection
failure
Replace the SIM card
Test the SIM card
Replace the card tray
Pass
Fail
The original SIM
card is damaged
Test the SIM card
Pass
Fail
Replace the card tray
Replace the card slot
Replace the
card holder
Signal
detected
Pass
Pass
Pass Pass
Pass
Damage
found
Fail
Fail
Fail
Fail
Fail
Test the time
sequence
Software is faulty.
Try formatting the
phone
Check components
on related circuits
Check the
main chip using an X-ray
machine
Replace the main chip
Replace defective
components
Visually
inspect the card
slot
No damage
No
signal
Test GPIO_
SIMx_DET
Test the
signals of all pins
of the SIM card
holder
Test the
impedance of all
pins of the SIM
card holder

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Huawei P20 Specifications

General IconGeneral
Panel typeTFT
Screen shapeFlat
Pixel density428 ppi
Second displayNo
Display diagonal5.8 \
Touch technologyMulti-touch
Touchscreen typeCapacitive
Display resolution2244 x 1080 pixels
Native aspect ratio19:9
Rounded display cornersYes
Display number of colors16 million colors
Processor cores4
Processor familyHi-Silicon
Processor frequency2.36 GHz
Coprocessor frequency1.8 GHz
Processor architectureARM Cortex-A73
Coprocessor architectureARM Cortex-A53
RAM capacity4 GB
Compatible memory cardsNot supported
Internal storage capacity128 GB
Flash typeLED
Rear camera typeDual camera
Front camera typeSingle camera
Video recording modes1080p, 2160p
Rear camera aperture number1.8
Front camera aperture number2
Rear camera resolution (numeric)12 MP
Front camera resolution (numeric)24 MP
Second rear camera aperture number1.6
Second rear camera resolution (numeric)20 MP
4G standardLTE
2G standardsGSM
3G standardsWCDMA
SIM card typeNanoSIM
Wi-Fi standards802.11a, Wi-Fi 5 (802.11ac), 802.11b, 802.11g, Wi-Fi 4 (802.11n)
Bluetooth version4.2
Bluetooth profilesA2DP, APT-X
SIM card capability-
Mobile network generation4G
Subscription typeNo subscription
USB version3.2 Gen 1 (3.1 Gen 1)
USB connector typeUSB Type-C
HDMI ports quantity0
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 factorBar
Product colorBlue
ThemesWallpapers
Graphics cardMali-G72 MP12
PersonalizationIcons, Menu, Shortcuts
Personal info management (PIM)Alarm clock, Calculator, Calendar, Notes
Speakersstereo
Audio formats supported3GP, AAC, APE, FLAC, MIDI, MP3, OGG, WAV
Video formats supported3G2, 3GP, ASF, H.264, MKV, MP4, WEBM
PlatformAndroid
Operating system installedAndroid 8.1
Talk time (3G)- h
Battery capacity3400 mAh
Battery recharge time1.5 h
Interface adapters includedUSB Type-C - 3.5mm
Weight and Dimensions IconWeight and Dimensions
Depth7.65 mm
Width70.8 mm
Height149.1 mm
Weight165 g

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