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.

à 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.


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



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


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


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

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

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




à 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.