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SERVICE MANUAL
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TABLE OF CONTENTS
INTRODUCTION………………………………………………………………………2
Chapter 1 EXPLODED VIEW AND COMPONENT DISPOSAL…………………3
EXPLODED DIAGRAM…………………………………………………………….3
DISASSEMBLY AND ASSEMBLY ………………………………………………………..4
SERVICE TOOLS…………………………………………………………………….4
DISASSEMBLE……………………………………………………………………….6
ASSEMBLY……………………………………………………………………………7
Chapter 2 SYSTEM BLOCK DIAGRAM……………………………………………8
Chapter 3 INSTRUCTION OF THE UNIT CIRCUIT……………………………….9
Chapter 4 ACTUALL BOARD……………………………………………………….10
SIDE A…………….…………………………………………..……………………………….16
SIDE B……………………….………………………………………………………………...16
Chapter 5 CIRCUIT INTRODUCTION………………………………………………11
Chapter 6 TROUBLESHOOTING……..………………………………………..…..27
Chapter 7 UPGRADE SOFTWARE INTRODUCTION…………..……………….34
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INTRODUCTION
The purpose of this document is to help service workshop technicians to service products. This service
manual must be used only by authorized service suppliers. The content of it is confidential. Please note
that provides other guidance documents for service suppliers. Follow these regularly and comply with
the given instructions. while every effort has been made to ensure the accuracy of this document, some
errors may exist. please keep in mind also that this documentation is continuously being updated and
modified, so always watch out for the newest version.
CAUTIONS
Please refer to the phone’s user’s guide for instructions relating to operation, care, and maintenance,
which include important safety information.
1. Servicing and alignment must be undertaken by qualified personnel only.
2. Ensure all work is carried out at an anti-static workstation and that an anti-static wrist strap is worn.
3. Use only approved components as specified in the parts list.
4. Ensure all components, modules, screws, and insulators are correctly re-fitted after servicing and
alignment
5. Ensure all cables and wires are repositioned correctly
Electrostatic discharge can easily damage the sensitive components of electronic products.
Therefore, every service supplier must observe the precautions which mentioned above.
GENERAL REPAIR INFORMATION
1. Make sure your testing equipment is functioning properly before beginning repair work.
2. before starting repairs you must observe ESD precautions such as being in your ESD
protected area and connecting your wristband.
3. use gloves to avoid corrosion and fingerprints.
4. cover windows and displays with a protective film to avoid dust and scratches.
5. use a lint-free cloth to clean the LCD.
6. when cleaning the pads use a soft cloth\ESD brush and isopropanol. Do not use a glass fiber pencil:
this scratches the surface and will corrosion.
7. non-faulty mechanical parts(except shielding lids and bent parts or soldered components). May be
reused if they are not soldered.
8. when removing the shielding lids make sure to replace them with new ones, otherwise the
high-frequency leakage can affect the device.
9. always use the original spare parts.
10. check the soldering joints of the parts concerned with regard to the fault symptom. And resolder
them if necessary.
11. remove excess soldering flux after repair.
12. observe the torque requirements when assembling the unit.
13. please aware that some malfunctions may be software related and solved by an update
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Chapter 1
EXPLODED VIEW AND COMPONENT DISPOSAL
1.1 EXPLODED
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1.2 DISASSEMBLY AND ASSEMBLY
1.2.1 SERVICE TOOLS
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Solder wire, soldering paste Wrist grounding strap, Antistatic gloves
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1.2.2 DISASSEMBLY
Remove battery cover Remove battery
Remove 6 screws Remove front cover
Remove 2 screws as above Take out PCBA
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1.2.3 Assembly
Assemble MIC Assemble PCBA
Assemble front cover Assemble screws
Assemble battery Assemble back cover
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Chapter 2
ACTUALL BOARD
SIDE A AND B
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Chapter 3 Electric introduction
3.1 Main CPU introduction
3.1.1 Digital BB
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3.1.2 Analog BB
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3.2 BT
3.3 Power
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3.4 GSM RF CIRCUTR
3.4.1 GSM RX
3.4.2 GSM TX
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3.4.3 GSM ANTENNA
3.4.4 RF PA
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3.5 SPI FALSH
3.5 MAIN MIC
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3.6 EARPHONE
3.7 SPEAKER CIRCUTR
3.7.1 INTERANL PA
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3.7.2 AUDIO PA
3.8 LCM
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3.9 CAMERA
3.10 CHARGE
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3.11 BATTERY CONNECTOR
3.12 HEADSET
5.12.1 HEADMIC
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3.12.2 HEAEEAR
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3.13 USB CONNECTOR
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3.14 KEYPAD
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3.15 SIM 1
3.15.1 SIM 2
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3.16 T-FLASH
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Chapter 4 Troubleshooting Guideline
4.1 Can not download
no
yes
no
yes
no
yes
Can not download
Can power on?
USB port appearance
check ok?
Change CUP U0100
Check download tool,
download cable,
software ok ?
Check power on porblem
Clean or change new USB port
Change new tool, new cable
or new software
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4.2 Can not power on
yes
yes
no
no no
no yes no
yes no
Can not power on
The current 0?
The power on current
low?＜100mA
Change U01
Change U0100
Change U0100 or
X0201
The power on current
high?＞200mA
Remove U0100
current ok?
Heat or change
U0100
Change battery ok?
Change battery
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4.3 Can not recognize SIM
yes
no
yes
yes
no
yes
Can not recognize SIM
Heat or change
U0100
Change SIM connector
Change U0100
The SIM connector
appearance ok?
The SIM connector
damaged? SIM pins dirty
or distortion?
The resistance to ground
of SIM pins ok?
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4.4 Keypads not work
yes
no no
yes yes yes
yes no no yes
Keypad not work
Change U0100
The resistance to
ground of these
keypads ok?
Only one key not work
Key 123 or key 456 or
key 789 or key *0#
not work?
The resistance to
ground of these
keypads ok?
Key 147* or key 2580
or key 369# nor work?
Clean or change the
domesheet
Change U0100
Heat or change U0100
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4.5 Display problem
yes
no no
yes yes yes
yes yes no
no yes
Display problem
Display white screen?
Display black
screen?
Diplay white line or
others
Upgrade software ok?
Upgrade software ok?
Change LCD
Software problem
Resolder or change LCD
ok?
Resolder or change LCD
ok?
Soldering or material
problem
Change U0100
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4.6 Receiver no sound
yes
no
yes no yes
4.7 Vibration problem the same to receiver
4.8 Speaker no sound the same to receiver
4.9 MIC pboblem
yes
no
yes yes
no
no
yes
no
Receiver no sound
Upgrade software ok?
Software problem
Change speaker ok?
Speaker problem
Change U0100
MIC problem
The MIC appearance
ok?
MIC soldering ok?
MIC rubber cover
broken or missing?
Change or get another
new rubber cover
Change MIC OK?
MIC material problem
Change U0100
Resolder MIC get
solve
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4.10 No charging
yes
no
yes
no
yes
4.11 Camera doesn’t work
yes
no
yes yes
no
yes no
No charging
USB port appearance
ok?
Clean or change USB
port
Change Q6100 OK?
Q6100 material
problem
Change U0100
Camera doesn’t work
Upgrade software ok
Software problem
Change camera ok?
Resolder camera ok?
Soldering problem
Camera materials
problem
Change U0100
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Chapter 5 Firmware Upgrading Guide
5.1 Firmware Upgrading
5.1.1 Install USB driver
Insert the download cable and then will find a popup display, follow the steps by red mark as
below
5.1.2 Find the correct driver as below
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5.1.3 Follow the steps will finish the installation, after finish and open the computer manager the USB
port will display as below
5.1.4 Run “UpgradeDownload.exe”
5.1.5 click this icon “ ”
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5.1.6 Select the correct software from the pop-up, then click “open”
5.1.7 Click this icon , a pop-up will be found
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5.1.8 Select the Port and Bautrate in red mark as below, then click OK
5.1.9 Click this icon start to download
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5.1.10 After click the tool will display as below
5.1.11 Plug the download cable into the phone, then put the battery into the phone.
5.1.12 Downloading
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5.1.13 Download passed
5.2 IMEI Writing Guide
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How to use “WriteIMEI” to write IMEI
5.2.1 Run “WriteIMEI.exe” , plug the download cable and select port as below red mark
5.2.2 Click select the model as below red mark
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5.2.3 Enter the IMEI number as below
5.2.4 Plug the download cable into the phone, then click the icon , next put the battery into
the phone, the tool will display as below
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5.2.5 IMEI writing finished
5.2.6 Write IMEI to another phone
After finished one phone IMEI writeing, just remove the download cable and use the same method
continue another phone writing.
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