Fly FS403 Service Manual

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FS403 SERVICE MANUAL

TABLE OF CONTENTS

INTRODUCTION………………………………………………………………………

Chapter 1 EXPLODED VIEW AND COMPONENT DISPOSAL…………………

EXPLODED DIAGRAM…………………………………………………………….

DISASSEMBLY AND ASSEMBLY ………………………………………………………..

SERVICE TOOLS…………………………………………………………………….
DISASSEMBLE……………………………………………………………………….
ASSEMBLY……………………………………………………………………………

Chapter 2 ACTUALL BOARD……………………………………………………….

SIDE A…………….…………………………………………..……………………………….
SIDE B……………………….………………………………………………………………...

Chapter 3 CIRCUIT INTRODUCTION………………………………………………

Chapter 4 TROUBLESHOOTING……..………………………………………..…..

Chapter 5 UPGRADE SOFTWARE INTRODUCTION…………..……………….

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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

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 back cover

Remove 3 inside screws Take out PCBA

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1.2.3 Assembly

Assemble PCBA Assemble 3 inside screws

Assemble back cover Assemble 6 screws

Assemble battery Assemble back cover

Chapter 2

ACTUALL BOARD

SIDE A AND

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Chapter 3 Electric introduction

3.1 Main CPU introduction

3.1.1 Baseband-A

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3.1.2 Baseband-B

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3.2 Baseband RF

3.3 RF PA

3.4 BT,FM,GPS

3.5 LCD

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3.6 Microphone

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3.7 Headset microphone and earphone

3.8 Loudspeaker

3.9 USB port

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3.10 SIM card

3.11 SD card

3.12 keypad

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3.12.1 keypad LED

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3.14 CHARGE

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3.15 Battery connector

3.16 Vibrator

3.16 TP

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Can not download

Can power on?

USB port appearance check ok?

Change CPU U101

Check download tool, download

cable, software ok ?

Check power on

problem

Clean or change new USB port

Change new tool, new cable or new
software

Yes

No

Yes

No

Yes

No

Yes

Chapter 6 Troubleshooting Guideline

4.1 Can not download

4.2 Can not power on

Can not power on

Change battery ok?

Change battery

The current 0?

The power on current

low?＜100mA.

Change U100

Change U1

Change U101 or X100。

The power on current

high?＞200mA;

Remove U101 current ok?

Heat or change U101.

Yes

No

Yes

Yes

No

No

No

No

Yes

No

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4.3 Can not recognize SIM

Heat or change U101

Change SIM connector

Change U101

The SIM connector
appearance ok?

The SIM connector damaged?
SIM pins dirty or distortion?

The resistance to ground of SIM pins
ok?

Can not recognize SIM

Yes

No

Yes

No

Yes

Yes

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4.4 Keypads not work

Keypad not work

Change Volume key

The resistance to

ground of the keypads

ok?

Volume key not work?

The resistance to

ground of these

keypads ok?

Power key not work?

Change Power key

Heat or change U301

no

Yes

Yes

Yes

Yes

no

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4.5 Display problem

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 U101

Yes

No

No

Yes

Yes

Yes

No

Yes

No

No

No

Yes

Receiver no sound

Upgrade software ok?

Software problem

Change speaker ok?

Speaker problem

Change U301

Yes

No

Yes

No

Yes

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4.6 Receiver no sound

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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 U301

Resolder MIC get solve

Yes

Yes

Yes

No

No

Yes

No

No

No charging

USB port appearance ok?

Clean or change USB

port

Change Q100 OK?

Q100 material problem

Change U301

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

4.10 No charging

4.10 Camera not work

Camera doesn’t work

Upgrade software ok?

Software problem

Change camera ok?

Resolder camera

ok?

Soldering problem

Camera materials problem

Change U101

Yes

No

Yes

Yes

No

Yes

No

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Chapter 5 Firmware Upgrading Guide

5.1 Firmware Upgrading

5.1.1 Install USB driver
The maximum downloading speed can be up to 921600bit/s when using USB-Serial cable.

The driver need to be installed before using the USB cable.

Please keep the USB cable unplugged when installing the driver.

Plug the USB cable when installing is completed. And check device manager of the PC.

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5.1.2 Run “FlashTool_v3.2’’

5.1.3 Please select “Options”-“COM port”-Choose the port which is same as the one in “Device Manager”

5.1.4 Select

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5.1.5 Please select “Do Not Format FAT”.

5.1.6 Click Download Agent MTK_AllInOne_DA.

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5.1.7 Click “Scatter-loading” and select “scatX11-23.txt” file.

5.1.8. Click “ROM” and select “X11-23_PCB00_gprs_MT6226_S01. Bin” file. Note: Please use the latest

version.

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5.1.9 Power off the handset, remove the battery, click “Download”, and connect the cable with handset, then
insert the battery, press the power on button, the red and blue progress bar shall appear.

5.1.10 Downloading is in process.

5.1.11 Downloading is completed.

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5.2 IMEI Writing Guide

How to use IMEI_Writer to write IMEI。
General ：

The IMEI_Writer software should be used in a Windows XP operation system. The pictures in this document
help to understanding, and thy may not be exactly the same as showed in your computer.

5.2.1 write IMEI to the slave phone of MGSM 41B phone to give an example.

5.2.1.1 Firstly, plug the correct upgrade cable to the computer. This is necessary, or the software will not be
run normally.

5.2.1.2 Double-click the logo in figure 1-1 to run the IMEI Writer in a Windows XP operation system.

figure 1-1

For the first timeyou run IMEI_Writer in the computer, figure 1-2 occurs. Choose the right database file for
the slave phone of MGSM 41B phone referring to figure 1-3.

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5.2.1.3 Input the IMEI of the slave phone referring to figure 1-4, click “Restart”, after 3 seconds plug the
slave phone cable connector to the phone and power on the phone.

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5.2.1.3 After several seconds, figure 1-5 occurs to show the slave phone is written to the phone
successfully.

5.2.2 Write the IMEI of the master phone.
If necessary, you can also use IMEI_Writer towrite IMEI to the master phone conveniently.

5.2.2.1 Change the database file to be for the master phone , referring figure 1-4.

5.2.2.2 Input the IMEI of the master phone, click “Restart”, after 3 seconds plug the master phone cable
connector to the phone and power on the phone.

5.2.2.3 After several seconds, figure 1-5 occurs to show the slave phone is written to the phone successfully.

5.2.3 Write the IMEI of another phone
If the right database file has already been choosed, click the “restart”,input the IMEI of the phone, click

“Restart”
after 3 seconds plug the phone cable connector to the phone and power on the phone. after several

seconds, figure 1-5 occurs to show the slave phone is written to the phone successfully.