FLY E100 Service Manual
TCL T728 Service Manual
TCL Mobile Communication CO., Ltd
T728 Service Manual
(GSM Cellular Phone)
TCL Mobile Communication CO., Ltd, China
July 8, 2005
1st Edition
For Use by Authorized Service/Maintenance Person Only
Documents to Receive This Addendum:
T728 Maintenance/Repair/Operating Manual
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TCL T728 Service Manual
TCL Mobile Communication CO., Ltd
Preface
This is the Electronic Service Manual for the GSM Digital Cellular Telephone from
TCL Mobile Communication CO., Ltd. It contains specific information on repair and
test procedures.
For details on user functions, general operation and installation, please refer to the User Guide.
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TCL T728 Service Manual
TCL Mobile Communication CO., Ltd
Contents:
Precautions for Repair Work.....................4
Chapter 1 Introduction ...............................6
1.1 Layout.................................................................................................................................6
1.2 Introduction.........................................................................................................................6
Chapter 2 Assemble and disassemble..............7
2.1 Schematic process of disassembly......................................................................................7
2.2 The process of assembly...................................................................................................16
Chapter 3 Logic Part...........................17
3.1 PM IC MT6305.................................................................................................................17
3.2 CPU MT6205B description..............................................................................................18
3.3 Power ON Control............................................................................................................18
3.4 Charge Circuit...................................................................................................................20
3.5 Back light circuit for LCD................................................................................................20
3.6 Motor circuit.....................................................................................................................20
3.7 Audio Part.........................................................................................................................20
3.8 LCD displaying circuit......................................................................................................21
3.9 SIM Card circuit...............................................................................................................21
Chapter 4 RF Part..............................22
4.1 RX Part.............................................................................................................................23
4.2 TX Part..............................................................................................................................24
4.3 Power Amplifier................................................................................................................24
Chapter 5 Tools and FAQ........................25
5.1 Tools..................................................................................................................................25
5.2 No Power On....................................................................................................................25
5.3 No Display........................................................................................................................26
5.4 No backlight......................................................................................................................27
5.5 NO transmitting................................................................................................................29
5.6 No ring tone......................................................................................................................30
5.7 No vibration......................................................................................................................30
5.8 No Net work......................................................................................................................31
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TCL T728 Service Manual
Precautions for Repair Work
TCL Mobile Communication CO., Ltd
(Provides general guidelines for undertaking safe and efficient repair work.)
※ Please read the following cautions, notes and warnings before any repair action.
l AC Power Cord：
Don’t short the pins together when you use.
Don’t damage the AC power cord.
Don’t put the AC power cord near the fire source.
Take care about the input power specify.
l Battery Pack：
Don’t short the terminals together.
Don’t put battery pack near the fire source.
Only use the standard battery and charger.
l Component polarity：
Please check the components polarity before soldering
l ESD：
Semiconductor devices are easily damage by electric discharge
To protect these drives from ESD a wrist strap connected to ground must
be worn. In addition to this work surface must be covered with an
anti-electrostatic mat, which should be grounded.
l Grounding：
Each test equipment should have electrically grounding, the third pin
provide a safety feature. Ensure the electrical outlet contains grounding
feature and connect to ground
l Soldering and De-soldering：
First the soldering-iron（or hot air tools）should have ESD protective
feature and fixed the temperature about 300℃.
The soldering tip should not be in contact with components or PCB tracks
for longer than 2 seconds.
Before soldering and de-soldering ensure the cellular phone is power off
and disconnected from the power source.
Heat the pad on the PCB and the lead, accurately and quickly apply solder,
remove heat and cool.
After soldering is finished, ensure that all solder joints are of good quality
such as no dry joints, solder bridges, cracks or excess solder.
After soldering is finished, use a cotton cloth to clean PCB.
l Test equipment calibration：
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TCL T728 Service Manual
The test equipment should be calibrated before used and should be
calibration periodical.
l Cleaning：
Before soldering and de-soldering ensure the cellular phone is power off
and disconnected from the power source.
Use a soft cotton cloth to clean cellular phone’s surface.
Never use benzene or any other chemical to clean cellular phone.
l Confidential：
The circuitry within this cellular phone contains several components which
are regarded as company confidential. Only TCL specified parts as
replacements.
l RF injury：
To avoid RF injury, direct exposure to radio frequency energy should be
avoid.
To avoid RF injury, do not touch the antenna directly.
TCL Mobile Communication CO., Ltd
l PCB handling：
It is recommend that cotton gloves are worn during repair work.
Don’t crash connector finger
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TCL T728 Service Manual
Chapter 1 Introduction
1.1 Layout
TCL Mobile Communication CO., Ltd
1.2 Introduction
T728 uses the solution of Media Tek(MTK)，its baseband part is composed of CPU
MT6205 and PMIC MT6305。The RF part is composed of the transceiver MT6129
and the amplifier RF3146。Its a high integrated and valued function-price-ration
platform。
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TCL T728 Service Manual
TCL Mobile Communication CO., Ltd
Chapter 2 Assemble and disassemble
2.1 Schematic process of disassembly
1、Remove the two screws from the phone with a screwdriver.
2、Use a plectrum to separate the base top casing from the base bottom casing toward
the back direction at first. Take care that there are two buckles on each side.
Plectrum
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3、Remove the base bottom casing
TCL Mobile Communication CO., Ltd
4、Separate the FPC connector and take out the mainboard from the casing:
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TCL T728 Service Manual
TCL Mobile Communication CO., Ltd
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TCL T728 Service Manual
5、Press down the axises
6.Take out the FPC from the base top casing:
TCL Mobile Communication CO., Ltd
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