Huawei G5500 User manual

HUAWEI TECHNOLOGIES CO., LTD.
Page 1
无线产品部
HUAWEI Technologies
HUAWEI TECHNOLOGIES CO., LTD.
www.huawei.com
A training Course for Huawei G5500
Wireless Product Department, August. 2010

HUAWEI TECHNOLOGIES CO., LTD.
Page 2
Preface
1. Introduction
2. Training Objective (Skills that can be gained from this course)
3. Reference Materials

HUAWEI TECHNOLOGIES CO., LTD.
Page 3
Preface: Introduction
This course provides information about G5500,
including the appearance, principle, ways and skills
of maintenance, procedures of assembly/disassembly,
and the use of the upgrade software.

HUAWEI TECHNOLOGIES CO., LTD.
Page 4
Preface: Training Objective
After finishing this course, you can:
Use and maintain G5500, assemble/disassemble
G5500, and upgrade software for G5500.

HUAWEI TECHNOLOGIES CO., LTD.
Page 5
Preface: Reference Materials
This section lists the reference materials of this
course. In addition, maintenance manual, upgrade
guide, and appearance check specification are also
included.

HUAWEI TECHNOLOGIES CO., LTD.
Page 6
Table of Contents
Chapter 1 G5500 Introduction
Chapter 2 G5500 Working Principle
Chapter 3 G5500 Tool Usage
Chapter 4 G5500 Maintenance
Chapter 5 Note Points
Chapter 6 FAQ

HUAWEI TECHNOLOGIES CO., LTD.
Page 7
Chapter 1 G5500 Introduction
1.1 G5500 Appearance

HUAWEI TECHNOLOGIES CO., LTD.
Page 8
1.2 G5500 Technical Specifications
G5500 is a GSM ultra low-High Music bar-shaped mobile phone. With a 2.0' inch TFT LCD. The
phone design takes human factors engineering into consideration. The material used is the
environment-friendly PC + ABS materials. The PCBA + LCM and the other electronic
components are lead-free products. The production functionality takes convenience as the basic
principle. It proposes a concept of environment protection and cost effectiveness, and provides
high performance/price ratio and practical functions.
The main specifications are as follows.
Architecture: GSM900/1800 or 850/1900MHz
Dimensions: 107 x 45 x 11.8mm
Weight: TBD
Call duration: TBD
Standby time: TBD
Display: 2.0QCIF’, 176*220, TFT, 65K
Contact capacity: Depend on SIM , Phone total：500
SMS capacity: Depend on SIM , Phone total：500

HUAWEI TECHNOLOGIES CO., LTD.
Page 9
Chapter 2 G5500 Working Principle
The composition and important functional components of the mobile phone are included.
G5500 is based on the MTK6253 platform, with the following components.
1.CPU:MTK6253
2.PMU:PMU integrates in MTK6253
3.PA :SKY 77552
4. Flash memory PF38F3050M0Y3DF
5.All ports : LCD port, SIM port , USB port (charger), keyboard port , battery port, audio port
(receiver, speaker), fm port, Bluetooth port and so on.

HUAWEI TECHNOLOGIES CO., LTD.
Page 10
Chapter 3 G5500 Utilities
3.1 Ways for Obtaining Software and Operation Manuals

HUAWEI TECHNOLOGIES CO., LTD.
Page 11
3.1 Ways for Obtaining Software and Operation Manuals
No. Software Operation manual Obtain from…
1 Upgrading software G5500 Software Upgrading Guide Huawei Terminal Company-OEM and
cooperation department
2 ATE test software G5500 ATE Test Software Operation Guide Huawei Terminal Company-OEM and
cooperation department
3 Software used to modify IMEI Operation Guide for the Software Used to modify G5500 IMEI Huawei Terminal Company-OEM and
cooperation department
4 Radio frequency test software Operation Guide for the Software Used for G5500 Radio Frequency
Test
Huawei Terminal Company-OEM and
cooperation department
5 Charging test software Operation Guide for the Software Used for G5500 Charging Test Huawei Terminal Company-OEM and
cooperation department
6 Antenna test software Operation Guide for the Software Used for G5500 Antenna Test Huawei Terminal Company-OEM and
cooperation department
7 Main board serial number printing
software
Operation Guide for G5500 BSN Printing Huawei Terminal Company-OEM and
cooperation department
8 Back bar code printing software Operation Guide for G5500 IMEI Printing Huawei Terminal Company-OEM and
cooperation department
9 Back patch bar code printing
software
Operation Guide for G5500 IMEI Patch Printing Huawei Terminal Company-OEM and
cooperation department
10 Color box label printing software Operation Guide for G5500 Color Box Label Printing Huawei Terminal Company-OEM and
cooperation department

HUAWEI TECHNOLOGIES CO., LTD.
Page 12
Chapter 4 G5500 Maintenance
4.1 General Maintenance Ways
4.2 Troubleshooting Power-on Faults
4.3 Troubleshooting Display Faults
4.4 Troubleshooting Back Light Faults
4.5 Troubleshooting Key Pad Faults
4.6 Troubleshooting Ringing Faults
4.7 Troubleshooting Receiver Faults
4.8 Troubleshooting Transmitter Faults
4.9 Troubleshooting Vibrator Faults
4.10 Troubleshooting PIM Socket Faults
4.11 Troubleshooting Charging Faults
4.12 Troubleshooting Signal Faults
4.13 Troubleshooting Bluetooth Faults
4.14 Troubleshooting FM Faults
4.15 Troubleshooting Camera Faults
4.16 Ways for Obtaining Maintenance Manuals

HUAWEI TECHNOLOGIES CO., LTD.
Page 13
4.1 General Maintenance Ways
4.1.1 Getting Well Acquainted with How the Cell Phone is Used
On receiving a faulty cell phone, do the following before set to take actions on it: asking the user
for the symptom, the time when the cell phone became faulty, and the way the cell phone acted
improperly. Check the appearance of the cell phone for damages. Normally, the fault can be
located in cases where the antenna is broken and the key caps are worn out. You need also to
make it clear whether the cell phone is second-hand, whether it had been repaired in any
places else, and the period it is taken into use. An experienced maintenance engineer can
roughly locate the fault and determine the faulty components according to the information about
the fault provided by the user. Such a way helps to improve maintenance quality and efficiency.

HUAWEI TECHNOLOGIES CO., LTD.
Page 14
4.1.2 Recording Faults
Faults fall into categories such as power-on failure, short-circuit due to moisture, broken, no
display, and so on. The causes of different types of faults differ a lot. Recording faults makes the
symptoms and maintenance purpose clear. It also achieves agreements between maintenance
engineers and users. In addition, you need to check to see if the cell phone has other faults.
This prevents possible post-maintenance conflicts effectively.
4.1.3 Writing Down the Model and IMEI Code of the Cell Phone
Each cell phone has a unique number, that is, the IMEI code. To avoid delivery errors, you can
write down IMEI codes before maintenance the cell phones received.

HUAWEI TECHNOLOGIES CO., LTD.
Page 15
4.1.4 Being Familiar with the Cell Phones to be Maintained
Being familiar with the cell phones to be maintained, such as key functions,
assembly/disassembly procedures, and the notes is the precaution of cell phone maintenance.
4.1.5 Making all the Tools Required Available
The tools required include the tools used to assemble/disassemble cell phones and test cell
phone functions, maintenance manual, cell phone architecture diagram, and so on. Making all
the tools required available is an important pre-maintenance job.
4.1.6 Choosing the Right Maintenance Way
Analyze the fault from a global view and then in detail. Locate the fault according to the
symptom and check the possible causes one by one. After the fault is located, take
corresponding measures with caution.
4.1.7 Maintenance Log
After the problem is resolved, log it for future reference.

HUAWEI TECHNOLOGIES CO., LTD.
Page 16
4.2 Troubleshooting Power-on Faults
4.2.1 Power-on Circuit
To pass then startup-key PWR_ON, PWRKEY is connected with GND, so the signal of PWRKEY
will be lower, and the startup process starts.

HUAWEI TECHNOLOGIES CO., LTD.
Page 17
4.2.2 Troubleshooting Power-on Faults
Startup faults usually include startup failure, charger startup failure, large current startup failure, automatic startup,
automatic shutdown, down system, and slow response.
Startup failure:
startup failure due to key problems: The current is 0mA. Usually it is caused by startup key failure or power supply.
Startup failure due to software problems: The current is dozens of mA. It is usually caused by the un-matching
software and hardware. Re-download of the software onto the mobile phone can solve the problem.
Startup failure due to power supply problem: The current reaches a certain value and cannot work properly.
Measuring showed a number of LDO voltage outputs are abnormal. Check the ground capacitance or the CPU.
Charger startup failure: When the charger is connected with the mobile phone, the power supply voltage turns to a
smaller value. The measuring of the ground resistance confirms that it is a MOS or CPU problem.
Large current startup failure: Measure the far-end ground resistance of the power supply outputs. Find out the short-
circuit place. Usually it is a CPU or SMT problem.
Automatic startup failure: Confirm that the mobile phone enters the common mode.
Automatic shutdown: Measure the important LDO output voltage. Ensure that each output is not faulty.
Down system: Clear the user data in the flash. Re-download the software. If the problem remains, change the CPU.
Slow response: Usually it is a CPU or flash problem.

HUAWEI TECHNOLOGIES CO., LTD.
Page 18
4.2.3 Maintenance Instances
Instance 1: startup failure
Symptom: Startup failure and failure to perform startup
Fault analysis: Connected the power supply directly and pressed the startup key. The startup
was normal. It was discovered that it was caused by the battery power was too low.
Solution: Charged the battery for a long time through the mobile phone. It was fully charged when
the power of the battery reaches the voltage of battery over-discharge.
Instance 2: Charger startup failure
Symptom: Startup failed after the charger was connected.
Fault analysis: Measuring of the VCHG voltage showed that it was only 2V or so. Finally found
CN701 was poor soldered.
Solution: Re-solder CN701.

HUAWEI TECHNOLOGIES CO., LTD.
Page 19
Instance 3: Slow response and startup difficulty
Symptom: Sometimes it was impossible to start up the mobile phone.
Fault analysis: It was discovered that the startup current differed each time. Measuring of the
Reset signal showed that the signal was available sometimes and unavailable at other times. It
was judged that the problem was CPU to poor soldering.
Solution: Re-solder U100.

HUAWEI TECHNOLOGIES CO., LTD.
Page 20
4.3 Troubleshooting Display Faults
4.3.1 Display
Circuit
The main parts of display
circuit are CN702 and
LCD; the circuit is
powered by MT6253 VIO;
LCM_LED+ provides
backlight driver, MT6253
and LCD NLD [0:8] signal
for data transmission and
several control signals