Meizu U20 Schematic
2016-11-22
第 1 页，共 33 页
Edited By:
Date:
Reviewed By:
Date:
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Confidential Document
©MEIZU
U20 Maintenance Manual
U20 Maintenance instructions
2016-11-22
第 2 页，共 33 页
Date
Revise version
Revise reason
Revise chapter
Revise
description
Author
2016-06-23
First version
Confidential Document
©MEIZU
Revise record
U20 Maintenance instructions
2016-11-22
第 3 页，共 33 页
Confidential Document
©MEIZU
Catalogue
CHAPTER 1 PRODUCT INTRODUCTION .................................................................................................... 4
1.1 PRODUCT APPEARANCE VIEW ......................................................................................................................... 4
1.2 PRODUCT CHARACTER INTRODUCTION .......................................................................................................... 5
CHAPTER 2 MAINTENANCE INFORMATION INTRODUCTION ......................................................... 10
2.1 MAINTENANCE NOTICE ITEMS ........................................................................................................... 10
CHAPTER 3 PHONE EXPLODED VIEW AND LIST .................................................................................. 11
CHAPTER 4 MAIN BOARD AND ASSISTANT BOARD COMPONENT POSITION VIEW .................. 12
CHAPTER 5 MAINTENANCE TOOL ............................................................................................................ 14
CHAPTER 6 PHONE PRINCIPLE AND FAULT ANALYSIS ......................................... 错误!未定义书签。
6.1 PHONE PRINCIPLE FIGURE AND INTRODUCTION ........................................................................... 15
6.2 POWER AND CIRCUIT PRINCIPLE AND CANNOT-POWER-ON MAINTENANCE ......................... 15
6.2.1 POWER-ON PROCESS STATEMENT .............................................................................................. 16
6.2.2 POWER-ON FAULT MAINTENANCE ............................................................................................. 16
6.3 RADIO FREQUENCY CIRCUIT PRINCIPLE AND MAINTENANCE.................................................. 18
6.4 BT/WIFI/GPS CIRCUIT PRINCIPLE AND MAINTENANCE ................................................................ 20
6.5 CIRCUMJACENT CIRCUIT ..................................................................................................................... 22
6.5.1 CHARGING FAULT ANALYSIS ....................................................................................................... 22
6.5.2 TOUCH SCREEN FAULT ANALYSIS ................................ .............................................................. 23
6.5.3 LCD DISPLAY FAULT ANALYSIS .................................................................................................. 24
6.5.4 GRAVITY SENSOR FAULT ANALYSIS .......................................................................................... 26
6.5.5 MOTOR FAULT ANALYSIS ............................................................................................................. 26
6.5.6 AUDIO FREQUENCY FAULT .......................................................................................................... 27
6.5.7 CAMERA FAULT ANALYSIS ........................................................................................................... 30
6.5.8 CANNOT READ SIM CARD FAULT ANALYSIS .............................................. 错误!未定义书签。
6.5.9 CANNOT READ T CARD FAULT ANALYSIS ................................................................................ 32
6.5.10 HOME BUTTON FUNCTION FAULT ANALYSIS ........................................................................ 33
U20 Maintenance instructions
2016-11-22
第 4 页，共 33 页
Name: SIM Tray
Color: Silver(Aluminum frame)
Deal with: Sand blasting + oxidation
Material: Aluminum alloy
Forming: Riveting (cnc + powder metallurgy)
Spare part: Mainboard holder
Color: White
Source: White
Deal with: No spraying, fire pattern VDI12#
Material: PC
Forming: Injection molding
Name: Auxiliary MIC
Forming: CNC
Internal black sand network
Name: IR hole, back, silk printing, black
Name: Indicator light, silk printing translucent ink
Spare part: mainboard holder Aluminum
Color: Silver (See the color plate)
Material: Aluminum alloy
Forming: CNC
Spare part: HOME Garnish
Color: Silver (See the color plate)
Deal with: An anodic oxidation
Material: Aluminum alloy
Forming: CNC
Name: USB port
Forming: Injection molding
Name: MIC Speaker hole
Forming: CNC
Internal black air filter
Spare part: HOME key
Color: White, same with TP
Deal with: Back screen printing
Material: Glass
Forming: Cutting
Name: Power key, volume key
Color: Silver (same with mainboard aluminum holder)
Deal with: Sand blasting+Oxidation
Material: Aluminum alloy
Forming: CNC finishing
Name: Handset network
Color: Black
Deal with: PVD
Material: stainless steel
Forming: Stamping +
corrosion mesh
Spare parts: TP (2.5D glass)
Color: white Partial black
Anti-fingerprint coating on the surface
Deal with: back screen printing
Forming: Cutting, grinding
Color: Transparent
Deal with: back screen printing black
Material: Glass
Name: Dual color temperature flash
Color: Transparent
Deal with: Optical module
Material: PMMA
Forming: Injection molding
Character silk printing:
Character silk printing:
Name: Camera decorative pieces
Color: Silver
Deal with: pvd
Material: stainless steel
Forming: Powder metallurgy
Aluminum strip of high light groove
Secondary oxidation
Name: 2.5D Glass back cover
Color: White
Deal with: back silk printing
Explosion-proof film on the back
Material: Glass
Forming: Cutting+ Grinding
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Chapter 1 Product introduction
1.1 Product appearance view
U20 Maintenance instructions
2016-11-22
第 5 页，共 33 页
U20 Product specification
General requirement
Refer to ID/CMF
Key Point
5.5 inch FHD high definition screen
3200mAh battery
5V2A charging
5M high definition selfie, 13M rear camera， dual color
temperature
16+2 memory is compatible with 32+3 memory (Both need import
production at the same time)
Pivotal hardware specification
Items
Requirement
Phone size
Length*width*height(m
m)
153*75.4*7.4mm（TBD），150g
Platform
Platform
MT6755M，1.8Ghz，Dual-care 64bit ；mali-T860 GPU at 550Mhz，
8 X Cortex A53
Network
GSM/WCDMA/TDS/CDMA/FDD-LTE/TDD
Frequency band
Configuration A： 6 modes 18 frequency:
All network public version(Public version, Oversea version) All
network public version into Mobile C warehouse;
Support TDD CA
Not support FDD CA
Support VOLTE
GSM: B2/3/5/8；CDMA：Bc0；WCDMA: B1/2/5/8
TD-SCDMA: B34/39;TDD: B38/39/40/41; FDD B1/3/7
Configuration B: 5 modes 17 frequency:
Mobile public version, Mobile customization version (use one model,
replace Mobile public version with Mobile customization version after
Mobile customization into A warehouse)
Support TDD CA
Not support FDD CA
Support VOLTE
GSM: B2/3/5/8；WCDMA: B1/2/5/8
TD-SCDMA: B34/39;TDD: B38/39/40/41;FDD B1/3/7
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1.2 Product charecter introduction
U20 Maintenance instructions
2016-11-22
第 6 页，共 33 页
Remark:B41 2555~2655MHz
Mode
(Single card single
standby, single card dual
standby, dual card dual
standby single card
through, dual card dual
standby dual through)
Dual card dual standby single card through, FLYME appreciation is
single card through
Hardware
demand
Screen
(Size, resolution,
material, color,
brightness）
5.5FHD、1920*1080，16 million color；Brightness：400min，450TYP，
404PPI；LTPS 16:9，All viewer，Contrast 1000:1，（ Phone brightness
330min）
TP
（Size,
Capacitive/Resistive,
G+FF/G+F/G+G/OGS,
Touch point quantity,
COB/COF,
Luminousness, hardness）
5.5 inch, capacitive, GFF, 5 points-touch, COF, all pasted, 2.5D,
Anti-fingerprints coating film, White matched color light sensation
single hole (LONGWEI DT-HW, consider with broken screen risks)
Main camera
（Pixel, AF/FF,
RAW/JEPG/YUV,
MIPI/Parallel port,
flashlight and
quantity/brightness）
13MP PDAF, 5P, F2.2 aperture, built-in ISP, size 8.5*8.5*4.65,
flashlight (quantity:2, dual color temperature)；
Assistant Camera
（Pixel、AF/FF、
RAW/JEPG/YUV、
MIPI/aperture）
5.0MP FF、4PLENS F2.0，F2.0，size 6*6*3.82、public built-in ISP
Memory
（ROM
（eMMC/NAND/NOR）
+RAM(DDR1/DDR2...))
ROM:16GB eMMC5.1 MLC，compatible with 32GB, RAM:2GB
LPDDR3 ，compatible with 3GB
Battery
（Li-ion/Li-ion polymer,
built out/built in,
memory, size, model）
3000mAh polymer battery, built-in, constant current constant voltage,
India BIS certification
Speaker
（Size, quantity, normal
membrane/composite
membrane, waterproof or
not）
1115X3.0mm; Make sound from side：
Speaker PA
Support（K type power amplifier）
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U20 Maintenance instructions
2016-11-22
第 7 页，共 33 页
Receiver
（Size, broadband, HAC
（T1-T4/M1-M4）,
waterproof or not)
1206;Composite membrane; Broadband 20mw
MIC
（Pin/SMT, Silicic MIC,
Dual MIC decreasing
noise）
Dual silicic MIC
Motor
（Flat/Columnar, manual
soldering/SMT/Clips）
Non-liner motor, flat 0827, According to the stack
Phone television
（CMMB/DVB-H/ISDBT 等)
NO
GNSS navigation
（GPS/AGPS, Big
dipper, Galileo）
GPS/GLONASS
WLAN
（WIFI/WAPI,
frequency band：
2.4G/5G）
Support 2.4G/5G WIFI；802.11a/b/g/n
BT
（Agreement
2.0/2.1/3.0/4.0、
EDR/HS/A2DP）
BT4.0
FM
（Receive only, receive+
launch）
MT6625L don’t need hardware FM function
NFC
（13.56MHz）
Not support
Fingerprint payment
Support fingerprint payment Goodix
OTG
USB OTG
Sensor
（Distance, light, gravity,
compass, gyroscope）
Environment light sensor/IR distance sensor(single hole),gyroscope
and gravitational acceleration two-in-one(support hardware
pedometer), electronic compass
Indicative light
Support breathed indicative light: White
HALL
Support （leather case specification confirms HALL position）
Button
Power button, volume button
Keyboard light
No
Flashlight
（LED light quantity, use
Camera Flash LED）
Make it true by rear camera flashlight
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U20 Maintenance instructions
2016-11-22
第 8 页，共 33 页
Spare battery
（Support/Not support,
replace by capacitance）
Not support
USB standard
（Low-speed、
High-speed、Full-speed，
support OTG or not）
5PIN Micro USB 2.0，OTG
Charging project
（Linear/Switch, max
charging current, support
fast-charging or not,
support reverse charging
or not）
Support 5V2A, not support fast-charging
Another functions
USB support the burning mechanism of melting
Multi-medi
a
Audio frequency format
FLAC、APE、AAC、MKA、OGG、MP3、MIDI、
M4A、AMR、WAV (RA、WMA)
The audio and video frequency format compatible handling and
copyright in the bracket handled by MEIZU company
Audio frequency code
and decode format
FLAC、APE、OGG、AAC、ADPCM、ALAC、
MP3、AMR－WB、AMR－NB (DTS、AC3、COOK、ATRC)
The audio and video frequency format compatible handling and
copyright in the bracket handled by MEIZU company
Video format
MP4、3GP、MOV、MKV、AVI、FLV、MPEG、
M2TS、TS (WMV、ASF、RM、RMVB)
The audio and video frequency format compatible handling and
copyright in the bracket handled by MEIZU company
Video format code and
decode format
H264、MPEG4、VC1、H263、MPEG1、MPEG2、VP8 (XVID、
DIVX5、DIVX4、DIVX3、VP6、WMV1、WMV2、WMV3、RV10、
RV20、RV30、RV40)
The audio and video frequency format compatible handling and
copyright in the bracket handled by MEIZU company
Figure
（Figures playing
format）
JPEG、PNG、GIF、BMP
Ports
Charging port
（Mini USB/Micro
USB）
Micro 5pin USB 2.0
Data port
（HDMI/Mini
USB/Micro USB/MHL）
Micro 5pin USB
Earphone port
（Mini USB/3.5mm
standard/2.5mm standard,
linear
orders(LRGM/LRMG)，
3.5mm American-standard
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U20 Maintenance instructions
2016-11-22
第 9 页，共 33 页
hermetic or not）
SIM
（Quantity, normal SIM
（Mini SIM）、Micro
SIM）
nano/nano/SD Choose two in three
User can customize main card
Memory
（Max capacity, Micro
SD/Mini SD/Others）
Micro SD support 128GB
Confidential Document
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U20 Maintenance instructions
2016-11-22
第 10 页，共 33 页
Static electricity release is the main reason lead to break the electric production sensitive
components. So every service centers should pay much attention to the static electricity
protective demand.
Confidential Document
©MEIZU
Chapter 1 Maintenance information introduction
2.1 Maintenance notice items
Only authorized technicians can do maintenance and calibration.
Make sure that engineers wear antistatic wrist strap repair phones in antistatic station.
Make sure all the components, screws and insulator are assembled well after maintenance and
calibration. Make sure all the electric cable and electric wire assembled well.
Soldering need meet the environmental protection requirement to solder without lead.
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