Huawei YU220 User manual

YU220 advanced edition maintain
service
V1.0
fiction：
R&D
date：
2013-08-06
examine and
verify：
maintain sustain
date：
2013-08-06
ratify：
serve representative
date：
2013-08-06
Huawei Technologies Co Ltd
Huawei Technologies Co.，Ltd.
All right reserved, Infringement shall investigate
All rights reserved

YU220 service manualV1.0
2013-10-18
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Revise record
Date
Revised version
Revise reason
Amend chapters
and sections
Amend describe
Author
2013-08-05
V1.0
First draft
issue
R&D

YU220 service manualV1.0
2013-10-18
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Content
CHAPTER 1 MAINBOARD WORKING PRINCIPLE................................................................................................................4
CHAPTER 2 MAINBOARD DEVICE LOCATION PLAN AND MATERIAL BOM INFORMATION................................................7
CHAPTER 3 MAINTAIN FLOW DIRECTION...................................................................................................................... 11
3.1 HOST MAINTAIN FLOW............................................................................................................................................ 11
3.2 FLASHTOOL LOAD GUIDANCE(HAVE ERASYRE FLASH OR ALL EARSURE FLASH ......................................................................13
3.3 STANDLONE VERSION WRITE STATION TOOL GUIDANCE.......................................................................................................15
3.4 WRITE CUSTOM MADE INFORMATION GUIDANCE.....................................................................................................15
CHAPTER 4 ADVANCED MAINTAIN CONDITION AND TOOL DETAILED ACCOUNT..........................................................16
CHAPTER 5 MOBILE PRINCIPLE AND MALFUNCTION ANALYSIS ..................................................................................17
5.1 FAIL TO START UP ....................................................................................................................................................17
5.1.1 NO CURRENT..................................................................................................................................................................17
5.1.2 LOWER CURRENT (DIRECT-CURRENT MAIN POWER SUPPLY) ......................................................................................19
5.1.3 LARGE CURRENT (DIRECT-CURRENT MAIN POWER SUPPLY).......................................................................................23
5.2 RESTART ON SCREEN...............................................................................................................................................26
5.3 utomatic shutdown crash ...................................................................................................................................................28
5.3.1 auto power-off...................................................................................................................................................................28
5.3.2 SYSTEM HALTED..............................................................................................................................................................30
5.4 MOBILE PHONE HOT,STANDBY TIME IS SHORT.........................................................................................................32
5.5 NOT RING ................................................................................................................................................................34
5.5.1 speaker noumenon bad......................................................................................................................................................34
5.5.2 speaker access ...................................................................................................................................................................34
5.6 NO RECEIVER ..........................................................................................................................................................37
5.7 NO SPEAKER,LOW SPEAKER VOICE .........................................................................................................................37
5.8 NO SIGNAL,FEEBLE SIGNAL ....................................................................................................................................39
5.9 NO RECOGNIZE CARD ..............................................................................................................................................41
5.9.1NO RECOGINZE SIM card.................................................................................................................................................41
5.9.2 NO RECOGNIZE TCARD...................................................................................................................................................44
5.10 NO CAMERASHOOTING.......................................................................................................................................44
5.11 TOCUH SCREEN NO WORK......................................................................................................................................46
5.12 FAIL TO CHARGE....................................................................................................................................................48
5.13 HEADSET TROUBLE...............................................................................................................................................51
5.14 FM ........................................................................................................................................................................54
5.15 GPS WIFI BT ......................................................................................................................................................56
5.16 MOTOR G-SENSOR SIDEKEY............................................................................................................................57
5.16.1 MOTOR ..........................................................................................................................................错误！未定义书签。
5.16.2 G-SENSOR ....................................................................................................................................................................58
5.16.3 SIDEKEY.........................................................................................................................................错误！未定义书签。
5.17 KEYPAD LIGHT .................................................................................................................................................59
CHAPTER 6 PCB BOARD AND BGA CHIP WELDING SPOT INDICATOR DIAGRAM ............................................................61

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CHAPTER 1 MAINBOARD OPERATING PRINCIPLE
MOBILE PHONE FUNCTIONAL BLOCK DIAGRAM INTRODUCTION
MT6323A
MT6572
Interface
MT6166A
VBAT
LCD BACK
LIGHT
USB
CHARGE
USIM
SIDE KEY
ADCBus
32.768
KHz
UART1
Antenna switch
UART2
Main Antenna
MIC
PWR KEY
HAEDSET
RCVER
TP
LCD
Interface
CAMERA
SPK PA
IIC Bus
TF CARD
NAND+DDR1
G SENSOR
CAM
CTP
IQ & control
Power
ControlGPIO
MT6627N
IQ &control
Connector
WIFI BT FM GPS Power
UMTS
GSM
WIFI/BT
Antenna
EXTERNAL
CHARGER
Power
Power
VIBRATOR
KEY BACK
LIGHT
Matching
BPI control
Duplexer
Matching
WPA
Matching
Matching
Matching
Matching
GPA
SAW
Matching
26MHz
MT6572 is baseband signal processing chip, which in charge of IMAGE, VIDEO,
AUDIO, RF INTERFACES, CONECTIVITY signal input and output dispose. Baseband
Interface section provides SIDEKEY、LCD、SD card、Bluetooth、CAMERA、TP
connector and so on.
MT6323 provide frequency including PA,VBAT input switch, output DC-DC,LDO，

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SIM card，LCD backlight and so on；
MT6166 is radio-frequency signal transceiver chip. Complete up and down RF
signal transformation.
According to logical function, veneer can be divided into base band、RF、power
and user interface including four subsystem. Each subsystem including module and
cell and realized function as show in picture.
subsystem
Module
Unit
Function
Baseband
subsyste
m
MT6572
Modem subsystem
ARM Cortex-R4 service as MODEM treater，
1.2GHZ, complete WCDMA ，GPS ，GSM
modulation-demodulation function, subsystem
includes ARM treater，modem DSP ，modem
AHB trunk, interrupt controller, and dormant
controller and so on.
Application
subsystem
NEON media processing engine, support SD card,
UART / USIM, I2C, GPIO, clock and
other functional modules, subsystems, including
ARM processors, application DSP, dedicated data
mover and so on.
User interface
processing unit
Camera connector 、broadband CODEC 、
Vocoder、RF connector、LCD connector、SD
connector、USB connector、UART connector、
USIM card connector、GPIO、keypad connector
and so on.
Multi-media and
game engine
Multimedia and game engine running Mpeg /
jpeg hardware engine, MP3/MMS/MIDI function;
power
management
（MT6323）
Power voltage
supervisory
External power input, battery,
VDD, so important for the LDO
Temperature
monitoring
Battery temperature、PA temperature
NAND
NAND features
consumption、file
system support.
Stored program and some NV,4Gb
DDR1 RAM
（POP）
Storage
RAM space run, 2Gb (64M ×32)
RF
subsystem
WCDMA and
GSM/DCS
launch receiver
AFC circuit, APC
circuit ，AGC
circuit ，each
device
Complete WCDMA receive and transmit RF
section functions. Mainly contains
additional MT6166 RF chip and peripheral circuits.
GPS
GPS receive
GPS signal receiving and processing, including its
peripheral additional circuitryMT6627
BT connector
BT module
Bluetooth and
WLAN complete baseband functionality and

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subsystem
Module
Unit
Function
RF signal transmission and reception. Including BT
+ WIFI module and the external additional
circuitry.
WIFI connector
Wifi chip
Adopt MT6627 chip complete
Crystal
oscillator and
frequency
synthetsizer
Adopt to crystal
oscillator, not
previous warm
oscillator
Local produce precision 26MHz reference
clock TCXOC;
antenna
External antenna,
interior connector
device, antenna
fence
Phone offers a built-in antenna,in order
to complete the communication,support
WCDMA and low frequency
bands. U8860-42 mobile phone
antenna comprising: a main antenna diversity
antenna, wifi / BT antenna, GPS antenna,
FM antenna(headset).
coupler
Power coupler
device
The WCDMA power amplifier output
power coupled in part to the MT6166 power
detection performed.

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Chapter 1 MAINBOARD DEVICE LOCATION PLAN AND
MATERIAL BOM INFORMATION

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BOM list below for information purposes only, to change without notice, To
apply, please Huaqin company T project management system queries BOM latest
information。

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Mainboard BOM information：
Bit NO
Material describe
BOM coding
U201
RF transceiver _GGE/WCDMA/TD-SCDMA+MT6166A
39200537
U202
RF power amplifier _1920-1980MHz
SKY77761
U203
3G RF power amplifier _W900
SKY77768
U204
Electromagnetic interference two-way stopband filters
_band8_W900_difference
SAYFH897MH
C0F0A
U205
Electromagnetic interference two-way stopband filters
_band1_W2100_ difference
SAYRF1G95H
Q0F0A
U101
RF amplifier module _900/1800
RF7182DTR13
马达
Shake device
J501
Battery connector _3pin_4.0H _3.0 PITCH
PAN30-03402
-S113
J802
IO connector _MicroUSB _5pin
UAF95-05164-
1522
X501
Crystal _32.768K_20ppm_12.5pF
SSP-T7-F
X201
Crystal_26M_10ppm_7.4pF_3225
X1E000021043
400
J701
Mic
U501
Power management chip +MT6323GA
39200536
J1001
3 in 1 connector _H4.15mm_2sim+TF
WKSM022-41
01
U601
MCP_4Gb-NAND_2Gb-DDR
MT29C4G48M
AAHBAAKS-5
WT
U301
Baseband chip _WCDMA+MT6572A/X
39200562
J801
Earphone jack _height 4.2mm
JAF00-05164-
S137
J903
Board to board connector_24pin_double
row_socket_1.0H_0.4pitch
DF37NC-24DS
-0.4V(51)
SPK
Speaker
U1101
WIFI-BT-FM-GPS 4 in 1 chip+MT6627N
39210152

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U801
Acceleration sensor IC chip _3 axle
BMA220
D1001~D10
03
LED white _HUE_N1,N3,CAE Contains only charge Q
LTW-C193SN5
J901
LCD pad
Attachment: maintain circuit diagram and bitmap
AW290_MB_V2.0_130
515_final.pdf
AW290A_MB_器件位
号图_V2.04_130729.pdf

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Chapter 1 maintain flow direction

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Host machine maintain flow
Failu
re
machi
ne
inspe
ction
/
analy
sis
Software
fault
Hardware
failure
Determine
the fault
NFF
Detected no
abnormalities
Flashtooluploa
dBOOT
（Only
uploadBOOT，
No erasure
FLASH）
Board software
upgrade
Phone function
tests
（MMI Detection
and machine
MT test）
Delivery
of
Quality
（
Compl
ete ）
change FLASH
Replace RF class
chip
（PA 、RFIC）
chang
eCPU
Replace other
devices
（recei
ver 、MIC、
LCD、Touch
panel
And
so
on
）
flashtooluploa
dBOOT
RF
comprehens
ive
measuremen
t
Phone function
tests
（MMI test）
upgra
de
Singl
e
board
softw
ard
STP1：
No. rewrite
physics
STP2：
Write
customized
information
Scrap
processing
FLASHTOOL
erasu
re
FLASH
Step explain：
FLASHTOOL half-erasure FLASH：FLASHTOOL half-erasure FLASH no erasure FLASH，
information of intrinsic RF correct will not lost, it doesn’t
need to correct. Specific loading method can refer to below
FLASHTOOL loading guidance.
FLASHTOOL erasure FLASH：After erasure FLASH, all information in FLASH will be
erasure and empty.
Specific erasure method can refer to below FLASHTOOL load guidance.
MMI test：MMI test is phone system comes with function self-test software, pass
MMI test can simple and fast judge mobile phone function whether
good. The specific test method can refer to primary service manual.
Complete machine MT test ：Complete machine MT test is Part of the
whole antenna signal test, pass MT test can judge mobile signal
whether good. Specific operational approach can refer to RF test
guidance.
Rewrite physics NO. ：Rewrite IMEI 、SN 、BT 、MAC address information. This

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section needs please refer to your local service policy to decide
whether you need to rewrite the original IMEI, if not ask for
a change IMEI, then use the original IMEI, this step can be
skipped. Please refer to the following specific steps guiding tool to
write numbers。
Write custom-tailor information ：Write lock network, national, and run the
business information. This section needs please refer to the
machine's original information operations, if the original version
without lock nets and other customized information, this step can be
skipped. Specific methods of operation please refer to the
following guidelines to write customized information.
RF calibration measurement: RF calibration and RF functional test, pass RF calibration
can make mobile RF performance to reach the best state; RF functional
test can detect whether the indicators of RF compliance. Specific test
methods can refer to measurement guidance and supply by other
document.
Mainrboard repair process description: mainboard repair process, please refer to the
host repair processes, the difference is that recognize it not need
to make the host MT test after fault repairing.
1.1 FLASHTOOL loading guidance（half-erasure FLASH or whole
erasure FLASH）
1. Open FLASHTOOL

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2. In accordance with the following configuration properties
1) Click scatter-loading choice box button, choose SCATTER.TEX document in
YU220 software to load.
Attention ：firstly need to delete check sum document in software. Click
Firmware->update, Press the volume up key to insert phone USB an enter into
the FLASH semi erasure upgrade
2) Click Download，Press the volume up key to insert phone USB an enter into
the FLASH whole erasure download, download complete as follow:

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3) During maintain, it can select according to different scene,;
Firmware->update retain SN，Calibration and measuring，IMEI ,MAC address etc
information.
1.2 Guidance of Standalone version write NO. tool
This step mainly supply phone write in veneer bar code and WIFI,BT address，IMEI
number Information. Operation as follow：
1) Install framework：HQ_Framework_v2.4_130708.rar
2) Install writes number tool：HQ_WriteStation_V2.1_130701.rar
3) Click running
a) Click Help ，check operation instruction, according to operation
instruction to configure; AP,DB file document with software sent to
user.
b) If it need to change IMEI、WIFI and number，need to rewrite IMEI
number and so on information, if it does not need to change, and close
the item.
c) Specific operation can refer to Write station instructions.HTM
1.3 Write custom-tailor information guidance.
SimLock使用说明.d
oc

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Chapter 2 Senior Maintenance Environment
Tools List
Name ：GPIB cable
Purpose ：use for RF calibration
Name：programmable power supply
Purpose：use for mainboard power supply
when RF calibration
Name ：CMU200
Purpose ：RF calibration
Name ：Multimeter
Purpose：measuring voltage and current

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Chapter 2 mobile principle and fault
analysis
In accordance with the following guidelines before the operation and
maintenance to ensure the phone is not a factor in environmental factors
and feature set. It recommends that you should backup customer information,
and then restore the factory settings for fault recognition.
1.4 Fail to start up.
Fault analysis treatment scheme：
For those fault phones which could not start up, please firstly check I/O
connector (battery connector) whether have apparent damage. If I/O connector
(battery connector) is OK, it can use DC stabilized power to supply power for
phone, check the current of the fault phones. No boot fault can be divided into
the boot, no current, low current, high current. In maintenance, please
according to the following specific methods for operation.
1.4.1 No current（direct-current main power supply）
No current ordinary have three probable reasons：1. Battery connector dry
joint；2. Power key damage；3. Power key relevance circuit or power manage
chip damage.
Maintain flow：

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Does not
boot -
no
current
Check the battery
connector J501 whether
Weld, dirty, damaged?
Replace J501
Inspect Boot FPC is
disconnected, damaged? Replace FPC
Check whether the FPC
welding OK? Reweld
Reweld or
replace U501
Y
N
Y
N
Y
N

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1.4.2 Low current（direct-current main power supply）
Appear lower current after press power key（15—80MA）ordinary below
reason：
a) Software fault：Ordinary force upgrade.
b) PM chip damage cause part of voltage without output.
c) CPU or FLASH damage。
Boot sequence diagram on electricity：

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Boot sequence diagram on electricity
Maintain flow：