RDO INSTITUTE OF MOBILE & LAPTOP COMMUNICATION : September 2012

Tuesday 18 September 2012

MOBILE SERVICE

Mobile Phone Repairing

1. Mobile phone Hardware Repairing.
2. Mobile phone Software repairing.

Overview of the Mobile Phone Hardware System

v Mobile Phone to Mobile phone communication system

SAMPLE PICTURE

(Simple GSM communication system,)
Ø A Mobile phone system is a collection of several hardware components that performs the basic system functions of input, processing, transmit ion, storage, and control.
Ø Hardware components of a mobile phone system include input, output components.

Mobile Phone Hardware Components

INPUT COMPONENTS

Ø Input components convert data into electronic form, then the electronic data transfer through a telecommunication network into a mobile phone system. The most popular input components are Keypad, and MIC.

OUTPUT COMPONENTS
Ø Output components convert electronic information produce by the mobile phone system into human understandable form for presentation for end user. Common output components are display and speaker.
Mobile Phone Operating System
Ø Operating system is the most important system software package of any mobile phone. An operating system is a set of programs that control the mobile phone hardware and act as an interface with human being.

Ø Each mobile phone has different operating system.

AN OPERATING SYSTEM PERFORMS FOLLOWING FUNCTIONS

1. Performing common mobile phone hardware functions.
2. Performing a user interface and input, out put management.
3. Managing system memory.
4. Managing processing tasks.
5. Providing network capability.
6. Managing file.

MOBILE PHONES BRANDS

v NOKIA
v SONY ERISSON
v SIEMENS
v MOTOROLA
v ALCATEL
v ACER
v I-PHONE
v I-MOBILE
v SAMSUNG

MOBILE PHONE PARTS

PARTS PICTURES
1. DISPLAY
2. BUZZER
3. VIBRATORY
4. SIM CONNECTOR
5. SIM HOLDER
6. KEY PAD
7. INTERNAL COVERAGE ANTENNA
8. CAMERA
9. BACK UP BATTER
10. DISPLAY RIBBON
11. CHARGING PIN
12. MIC
13. EAR PEACE

MOBILE PHONE ICS

1) RF Power amplifier .(Power amp)
2) Antenna switch.
3) Radio frequency IC. (RF IC)
4) Power IC or Power supply IC.
5) Charging control IC.
6) Audio IC.
7) CPU IC.
8) Read only Memory. (Rom)
9) Random access memory. (Ram)
10) Radio IC.
11) Sim IC.

Mobile Phone Hardware Repairing Tools
TOOLS PICTURES
a. Screwdrivers
v Slotted
v Phillips
v Clutch-Driver
v Torx
v Robertson
v Allen

b. The parts grabber
c. The chips extractor/IC Extraction tool
d. Nose pliers
e. Tweezers
f. Soldering arm
g. Hot gun
h. Multi meter
i. Oscilloscope

Mobile phone Software Repairing Tools and Software

Ø Computer
Ø Mobile phone Cables
Ø Mobile phone Unlocking and Repairing Boxes
Eg:-UFS3 Box, Griffin Box, MT-Box, JAF Box.
Ø Mobile phone Unlocking Repairing Software
Eg:-Sarasoft.
Ø Memory Card Reader and Writer
The Following Fault Have to be repaired By Software
Mobile Phone Unlocking

If the following Words displayed on the Mobile Phone that the Phone have to be unlocked.

1. Sim card not accepted
2. Sim not valid
3. Phone Restricted
4. Phone disable
5. Insert correct Sim
6. Permanently blocked
7. Network lock
8. Network code
9. Special code
10. Unlocking code
11. Network blocked
12. Sim lock
13. Wrong card
14. Production code

NOTE-: Check the mobile phone IMEI before you Unlock. If the IMEI number start with “0” that Phone could not work in SRILANKAN Network.

Mobile Phone OS Installation (Mobile phone flashing)

If the following Message displayed on Mobile phone display or other following indication or indications in the Mobile phone, this phone should be reinstalled with its Operating System.

1. Contact service.
2. No power Phone.
3. When the power ON mobile phone, the display light only light. (But mobile phone switch will not OFF).
4. Start up failure.
5. When sending SMS or MMS Phone power OFF.
6. When sending Picture Message Phone may struck.
7. Phone restart while Sending file thought the Bluetooth.
8. Phone Power OFF while open downloaded via GPRS files.
9. Phone restart while press GO-TO button.
10. While selecting ringing tone phone restart.

Mobile Phone Hardware repairing fault

If the following Message displayed on Mobile phone display or other following indication or indications in the Mobile phone, this phone should be a hardware fault.

1. No power phone (If it is not Software fault).
2. Signal drop.
3. No network.
4. No service.
5. Network Searching.
6. Phone auto on while insert battery.
7. Phone gets heat while power ON the phone/
8. Speaker Fault.(Unable to hear next end speaker voice)
9. No ringing tone.
10. Key struck.
11. Not charging.
12. Auto charging
13. Reconnect charger
14. Optimized charging.
15. Battery empty.
16. Insert Sim card.
17. Auto vibrating while inserting battery.
18. No LED light.
19. No Display/
20. Phone restart.

If there is any fault or damages in the parts of the M0bile Phone the following indication will appear;-

If Mobile phone battery damaged

v No power.
v Call holding off.
v Call sending off.
v Call end.
v Not charging.
v Searching off.
v Invalid battery.
v Charging impossible.
v Auto off.

If coverage antenna damaged
v Signal drop.
v No network.
v No service.
v Network search.
v Emergency call only.
v Sos call only.
v No access.

If there is any damages on the battery pin of the mobile phone.
v Not charging.
v No power.
v Unable to power on.
v Charging ok but power not on.

Key pad or Mylar pad damaged.
v Key struck.
v If on/Off button in the key pad.
§ Mobile phone unable to power ON.
§ Auto ON.
§ Phone OFF when press any key.

If there is any fault or damage on mobile phone Speaker.
v Unable to hear the end caller voice or voice not clear.

If there is any fault or damage on mobile phone Mic.
v End caller unable to hear the voice.

If Charging Pin has any damaged
v Not charging.
v Head set unable to connect.

If there is any fault or damage on Ringer/Buzzer of the mobile phone.

v No ringing tone.
v Low ringing tone.

If there is any damages on mobile phone Vibrator Motor.

v Mobile phone unable to vibrate.
v Low vibrate.
v Vibrating Continuously.

If there is any damages or fault on Sim connector or Sim tray.

v Insert Sim Card (Phone unable to access with sim card)
v Error card.
v Check card.

If there is any damages on mobile phone Display or Display Ribbon.

v No display “No visual display in the display”
v Display darkness.

If there is any fault or damages of the mobile phone Camera.

v Camera preview error.
v Phone will struck when take photo.
v Phone will heat when take photo.
v When go to camera menu Display comes full black.

IF the following ICs of the Mobile Phone have any fault or damage, the following problem will occur.

Ã RF Power Amplifier IC (Power AMP IC).

Ø No power.
Ø Signal drop.
Ø Call end.
Ø Call holding off.
Ø Auto off.
Ø Battery empty.

Ã Antenna Switch IC
Ø No net work.
Ø Signal drop.
Ø Low Signal.

Ã Power IC
Ø No power.
Ø Auto off.
Ø Restart.

Ã Charging Control IC
Ø Not charging.
Ø Reconnect charger.
Ø Auto charging.

Ã Key Pad IC
Ø Key struck.
Ø Auto vibration.
Ø No LED light.
Ø Phone off press any key.

Ã Audio IC
Ø No ringing tone.
Ø No vibration.
Ø Speaker and Mic in out of order.

Ã CPU
Ø No power.
Ø Restart.
Ø Auto off.
Ø Start up Failure.
Ø Phone Struck.

Ã Ram or Rom IC
Ø Contact service.
Ø Unable stored information.
Ø Lost stored information.
Ø No power.

Some NOKIA mobile phones having same ICs and same Mother bard .These are
Power AMP
• 3310
• 3315
• 3330
• 3410
• 3510

• 8210
• 8250
• 8855
• 2100
• 3610
• 6210
• 6310

• 3310
• 3330
• 3315
• 3410
• 3510
• 3610
• 2100
• 8850
• 8250
• 8855
• 8210
• 6210
• 6310
• 8910
• 8810

• 3210
• 7110

• 8310
• 6510

• 3100
• 3120

Trouble Shooting

Mobile Phone Fault Replace with new IC

NOKIA Signal drop • Power AMP
• Antenna Switch
Auto vibrations • Key pad IC
Not charging • Fuse
• Charging IC

v Repairing a No power phone

§ Check the mobile phone battery Voltage, and if the battery has insufficient voltage, recharge the battery and try to power on the phone.
§ Connect the charger with the phone and, watch whether the phone able to charge properly, if the able to charge, check the mobile phone on\off switch.

§ Note: Most of the mobile phone has on\off switch in the key pad, there for check the key pad.
§ Some times mobile phone have any loose connection, therefore put a service to that phone.
§ Some no power mobile phone, battery pin have any damage or battery pin loose connection with the mother board, therefore you will have to clean the battery pin and try to power on the phone.

Friday 14 September 2012

RDO INSTITUTE OF MOBILE & LAPTOP COMMUNICATION TECHOLOGY

ABOUT AS

We are the India’s Most Prominent Institute engaged in training Students for Vocational Courses like Mobile/Laptop Repairing & Hardware Networking .We provide computerized Mobile Phone / Laptop repair training starting from basics to chip level. We have trained thosands of students who are working successfully in service centres or have set up their own businesses and shops. We are highly endured in the industry due to our quality teaching & State of Art labs

Chip Level Laptop Repairing Course chennai India

Course Contents

Motherboard Overview:
Main Signals of Motherboard And How motherboards Work with Different ic

Define different Laptop problems

Common Laptop Notebook Chip

POWER SUPPLY CHIP

IO CHIP

CPU power supply chips

Charge discharge control chip

CPU temperature control chip

Graphics Brand

Ethernet chips

Sound audio Chip

PC Card Chip

COM port chip

Keyboard-chip

Keyboard chip

Battery IC :

Memory control chip

Clock IC :

lcd back light control

Ddr memory power supply

Other Common chipset

Mosfets Used

Crystal (14.318 Clock )

Connector Socket(display, battery, dvdrom, modem, keypad, touchpad, onoff panel etc)

Fault finding and troubleshooting of motherboards

Tracing different connectors and socket with related component and chip

Testing and using of different components

Dc to dc power regulator sections

Power supply to different chips vcc core, 5vsus, +1.5v, 1.8vsus, 5v, 10v, 2.5v

Cpu core voltage, vid signals, vrm section, mosfet of vrm

Clock generation circuits

Bois chips section, rtc chip

Power good , reset,frame, clock, bios signals

Fault finding and troubleshooting.

How to read different component datasheet.

Basic cleaning and washing method of motherborad

Smd component pratice removal and inserting different components

Training using cro osciloscope

Finding fault using cro osciloscope

Use of debug card post error code

Finding fault using post debug card

Training using eeprom programmer

Bios update using eeprom programmer

Training using bga soldering station

Removing bga chips and rebolling it using reball stencil

Ics rebolling, bga ball arrangement, pratice

Training using solder batch

Removing socket & connectors using solder bath

Bios password, ibm, dell password removing steps

Searching data sheets of different ics

Common problems of different motherboards

Equipment/Tools used for Laptop Repairs

Motherboard Voltage Regulator Circuit

hdd repair

How an image appears on the Lcd screen

How I installed external Bluetooth adapter inside a laptop

How To Bypass Windows 7 Logon Password In 3 Steps

How To Fix Failed Nvidia Chip

How to fix hardware problems without taking apart the Laptop

How to replace battery cells inside laptop battery

How to test a laptop or a desktop computer memory

Steps to Hacking Dell D600 Bios Password

Top 10 Things to Consider When Selecting a Digitizer x Oscilloscope

Find Answers to Your Technical Questions Visit Our

See Samples Below

Q: Would love to know how you diagnose motherboards on a component level. What tools do you use?

A: I find it is very hard to explain this. actually, it is very simple and can be described in two words: current and singal. read the current change during booting tells you where the machine stopped. check the singals on the different part of motherboard tells what is wrong or what may missing.

Tools are: smd rework station, bga rework station, power supply has current meter. all the rest tools you can find in any radio tv repair shop.of course all the datasheets for the components, especially the schematic diagram, you will find it much difficult without it.

Q:What are common faults on mainboards?
Do certain components fail? Is there a trend as to which parts fail quite often?

A: Different maker/model has different common fault. Toshiba S1 is vga chip, and can't be repaired(well, almost can't be repaired because the pcb quality is not very good so successful rate is very low).
HP DV2000, 6000, 9000, compaq v3000, v6000, dell 1210, all those use nvidia chips have problem on vga chip or north bridge. easy to repair but have to make fan keep spinning after repaired, otherwise will break down in 1 or 2 week again.

hp nx5000, cpu pwm chip dry joint. acer 290, cpu pwm dry joint.
hp dv1000, compaq m2000 protection circuit easy to blow up.
ibm t40 vga dry joint problem.
These are just few of them. every machine has its own common fault. but dry joint is the common problem for all machines. Motherboard repair is not as difficult as people thought, i think much easer than repair a tv.

Q:Dell 1525 Inspiron that says system does not recognize the installed battery this system will not charge the battery.

A:Charging battery in Dell laptop involves two major chips: EC(or someone call it super IO), PWM chip for battery charging. BIOS has no part of charging. Battery communicate with EC through SMB(system management bus??) and EC controls charging PWM. Fix charging problem is very hard in laptop repair, you must fully understand schematics, where all the signals come from and where to go.
Today's laptops are less and less with programmed EC, Dell 1525 has no programmed EC so it can be replaced with same model.

Q: How i fix a DV6 with power problem. The problem of machine is it cannot power up at all.

Doing routine check:
1. system power: 3V, 5V all presented - ok
2. NBSWON signal: 3.3V presented - ok
3. press power button, NBSWON pull down to 0V, ok
4. check DNBSWON while press power button, no response. - problem.
in here I made a mistake, I didn't pay attention of the voltage of DNBSWON, this mistake waste me the next few days time. It should be 3.3V, but only about 1V.

Change EC as usual, because I thought the EC has problem. Then the big trouble comes - it auto power up once I plug in the power but stop in 0.04A current. Check and find no S5_ON signal, which indicate south bridge has problem, so change south bridge. But still same problem and still no S5_ON. I find that the EC I change is kb3926A rather than kb3926C. In most case, this is no problem but in very rare occation...
So I find a 3926C and put on. Now the motherboard is back to the same problem while I first start to check! So I change a wrong EC and this time I change a correct one, and also EC has no problem!

Because EC will start to read bios once the power plug in(not as people think, once you press power button). I check BIOS chip, BIOS_CS should have a countinue wave form but it just one stright line. BIOS chip is faulty, I replace the BIOS chip and it works perfect.

MOBILE CHIP LEVEL TRAINING

Basic Mobile Phone & Chip Level Training

History of Mobile Phone
GSM & CDMA Structure & Generation of Mobile Phone
Frequency & Channels
Wi-Fi, SIM, & IMEI
Mobile Phone Assembly & Disassembly
Electronic Components Overview
Chip Level Soldering & De-soldering Mobile Phone Complete Software Repairing
Parts of Computer
Computer Operating
Driver Installation
Software Repairing
Mobile Phone S/W repairing with coding
Chinese Mobile Phone Repairing Mobile Phone Basic Electronics & Complete Hardware Repairing
Introduction to Electronics
Charge
Voltage
Types of current
All Electronics Components Identification testing & their working
Basic Tips for Mobile Phone Hardware Repairing
Section of Mobile Phone
Circuit Diagram Reading
GSM Mobile Phone Troubleshooting
Chinese Mobile phone Troubleshooting
CDMA Mobile phone Troubleshooting
Practically handset repairing