Mobile Cell Phone Repairing | Mobile Phone Repair Guide, Help, Tips, Pictures, Videos, Hardware, Software Solution

Mobile Phone Parts

Mobile phone parts and components consist of several small, medium and large parts and components. Parts and components in most mobile cell phones are more or less the same including – Samsung, Nokia, Acer, Alcatel, Apple, Geonee, Asus, BenQ, Siemens, Bird, Blackberry, Blu, Celkon, Dell, Gigabyte, Haier, HT, Huawei, Micromax, LG, Motorola, iMobile, i-Mate, Panasonic, Philips, Spice, Sony, Sony Ericsson, Toshiba, ZTE Etc.

Mobile Phone Parts

Mobile Phone Parts

 

Mobile phone Parts and Components:

  1. Antenna – Antenna in a mobile cell phone is used to receive and transmit radio frequency. Antenna is inbuilt in the cabinet of the mobile phone. These are called inbuilt antenna.
  2. Battery– The battery is the only source of power supply to a mobile phone. Three types of battery (3.6V) are used in most mobile cell phones – (1) Nickel – Cadmium (Ni-CD) (2) Nickel Metal Hydride (Ni – MH) (3) Lithium – Ion (Li – Ion).
  3. Battery Charger – Several types of mobile phone charges are used recharge the battery of a mobile cell phone. These include normal mobile phone battery chargers, Travel Adaptor (TA), Cigar Lighter Adaptor (CLA) etc.
  4. Switch or Key Tip – These tiny switches are used for the key pad of mobile phones.
  5. Central Processing Unit (CPU) – The CPU is the control section of a mobile phone that controls all the function of the mobile phone. It does all the processing work of the phone.
  6. RAM (Random Access Memory) – RAM is an erasable memory where older data and information can be erased and new data and information can be stored.
  7. ROM (Read Only Memory) – A memory that can only be read. It cannot be erased. Programmable ROM (PROM) and Erasable ROM (EROM) are some other types of Rom Memory that can be erased.
  8. Visual Display – This part of the mobile phone generates light to display all information. Display of a mobile cell phone can be classified as follows – (1) LCD (Liquid Crystal Display), (2) VFD (Vacuum Fluorescent Display), (3) TFT (Thin Film Transistor Display).
  9. Antenna Switch – Part of a mobile phone that that does the function of receiving, transmitting and switching of different frequencies like GSM, DCS and PCS.
  10. IF IC – This IC is also called Hager IC, MJOLNER IC and RF IC. It performs the function of amplification of receiving signal, mixing and demodulation.
  11. VCO (Voltage Control Oscillator) – Controls frequency.
  12. Audio IC – The main function of this IC is to handle and control audio frequency and produce sound.
  13. UEM IC (Universal Energy Module) – It performs several functions like power supply, charging, audio processing, ringer vibrator etc.
  14. LED (Light Emitting Diode) – It is used to produce light on keyboard and display.
  15. RF Crystal – This is the main and very important crystal in any mobile phone. Crystals of mainly 13 MHz, 26 MHz, 19.2 MHz or 36.4 MHz are used in cell phones. Mobile phone becomes dead if this crystal is faulty.
  16. Ear Speaker – This speaker is mounted on the top side of the mobile phone. It helps to listen sound.
  17. Microphone – It converts voice signal to electric signal or tone signal during transmission. This signal is then sent to the Audio IC.
  18. Vibrator Motor – Provides vibration alert during incoming calls or messages in silent mode or when the option is On.
  19. SIM card – SIM stands for Subscriber Identity Module. It is used in GSM Mobile phones. There is a micro chip in this card in which all data and information related to the USER and the Mobile Phone is stored. Without a SIM Card, a GSM mobile phone is of no good use.
  20. SIM card Socket – Holds the SIM card and acts like a SIM reader or SIM writer.
  21. Memory Card – External memory storage card used to store data such as photos, videos, audio etc. SD card, Mini SD Card and Micro SD cards are used as external memory in mobile phones.
  22. External Antenna Socket – External antenna can be connected with the help of accessories in this socket. This helps to increase the range of internal antenna.
  23. RETU IC – This module performs several important functions for the mobile phone.
  24. TAHVO IC – This module also performs several important functions in a mobile phone.
  25. OMAP Module – Performs the function of processing application software and control UI software.
  26. Hands free Connector – Helps to carry on conversation on a mobile phone without holding it in hand using head phone.
  27. Flash IC – This memory inside a mobile phone is used to store programs and non volatile data.
  28. RAP 3G IC – This IC has been used as core with non Flash and SD RAM memory module in modem section. RAP3G module works as cellular protocol with WCDMA and GSM.
  29. USB Connector – This connector is used to download data and for charging the mobile phone.,
  30. Joy Stick – Used to ease the function of the user. User can control the operation of a mobile phone by setting the functions of joystick.
  31. Software Connector Parts – Used for flashing of mobile phone. Mobile phone may be connected to a Computer through this connector to solve software related problems.
  32. Connector Tip – Used to interface speaker, ringer, vibrator and antenna.
  33. Testing Points – Output of various types of signals are checked from these tips with the help of CRO.
  34. LTR – This regulator part is used to regulate the voltage in a mobile phone.
  35. AVILMA IC, BETTY IC, UIM Card – Few other parts inside a mobile phone.


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Integrated Circuit (IC)

Integrated Circuit or IC is an electronic component made up of combination of several transistors, diode, resistor, capacitors in a tiny semiconductor chip. Integrated Circuit Electronic Components or IC are of small size and very light weight. They produce excellent results at low power. Components used in an IC are not visible from outside. These are built in a semiconductor chip and cannot be removed. Capacitors of more than 30 PF value are not used in IC nor can inductors and transformers be mounted inside the chip of an IC. Thousands and millions of bi-polar transistors and CMOS (Complimentary Metal Oxide Semiconductor) FET are used in making an IC..

Types of Integrated Circuit (IC)

On the basis of external structure, ICs can be classified as follows:

  1. Single in-line pin package (SIPP).
  2. Dual in-line pin package (DIPP).
  3. Quard pin package.
  4. Pin Grid Array Package (PGA).
  5. Ball Grid Array Package (BGA).
  6. Leadless Chip Carrier (LCC) Package.


BGA IC – Ball Grid Array

IC without pins are used in mobile phones which are called Ball Grid Array (BGA). To count the number of pins in a BGA IC, there is a circular point sign on a corner upside, or there is a deep circular sign. Ball Grid Array is kept on the palm in a manner so that the circular sign faces the thumb downwards. Read: Counting Legs or Pins of an IC

Integrated Circuit

Integrated Circuit

Types of Integrated Circuit (IC) on Basis of Technology

There are two types of IC on the basis of technology:

  1. Linear IC – This type of IC works on analog signal where output signal varies according to the variable input signal.
  2. Digital IC – This type of IC works on digital signal. A defined output signal is received from a defined input signal. On the basis of electronic components used, the digital IC are of various types. Examples of Digital IC – CMOS (Complimentary Metal Oxide Semiconductor), DSP (Digital Signal Processor), DRAM (Dynamic Random Access Memory), ROM (Read Only Memory), PROM (Programmable Read Only Memory).


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Surface Mount Transistor in Mobile Cell Phone and Their Function

Surface Mount Transistor or SMT Transistor is an SMD electronic component made up of semiconductor material like silicon or germanium. There are 2 types of Surface Mount Transistors:

  1. NPN Type
  2. PNP Type

There are three terminals of a transistor:

  1. Ammeter (E) – Flows current on receipt of forward bias. Electrons are emitted in NPN transistors whereas PNP transistors emit ‘holes’.
  2. Collector (C) – The terminal of the transistor which receives the emitted electrons or holes. Collector always works or reverse bias mode.
  3. Base (B) – The layer between ammeter and collector is called base. Base displays the property of showing low resistance in ammeter junction forward bias and high in collector junction reverse bias.

Facts about Transistor:

  1. Indicating Character: Q or V, TR
  2. Function: Switching, Amplification, Regulating Voltage.
  3. Unit: Transistors are identified according to the code.

Digital Transistor

In digital transistor, resistance in built in the base and ammeter. This transistor is also called RET (Resistance Equipped Transistor). This type of transistor is used in mobile phones for reducing the current consumption.

Field Effect Transistor (FET)

Surface Mount Transistor

Surface Mount Transistor

This type of transistor is controlled by voltage instead of current. Flow of working current through a semiconductor channel is switched and regulated by the effect of electrical charge in the area near channel which is called gate. This is called unipolar transistor. FET can be P-Channel type or N-Channel Type.

Metal Oxide Semiconductor (MOSFET)

MOSFET is active semiconductor components. MOSFET has 3 terminals – source, drain and gate. There are 2 types of MOSFET:

  1. P-Channel MOSFET (PMOS)
  2. N-Channel MOSFET (NMOS)


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Wi-Fi Wireless Internet Connection Problem and Solution in Mobile Cell Phone

There are situation when a mobile cell phone of any brand including Samsung, Nokia, LG, iPhone, Micromax, China Mobile Phones etc may give problems such as Wi-Fi wireless internet connection.

There can be different symptoms, reasons and solutions to identify, solve and fix the problem.

Following are some of the Basic Solution and Ways on How to Solve and Fix Mobile Cell WiFi Wireless Internet Connection Problem:

Mobile Phone Wi-Fi Problem

Mobile Phone Wi-Fi Problem

  1. Enable Wi-Fi and check if it is working or not. Make sure you are connected to a wireless Wi-Fi Network.  Make sure the password is correct.
  1. If the Wi-Fi cannot be enabled and you are not able to use or access internet then there could be problem with the Mobile Phone PCB. You may have to replace the PCB.
  2. If the Wi-Fi can be enabled then there is no problem with the PCB. Just upgrade the software / operating system (OS) of the mobile phone or smartphone to the latest version. This should solve the problem.


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No Sound in Mobile Cell Phone Speaker Problem and Solution

There are situation when a mobile cell phone of any brand including Samsung, Nokia, LG, iPhone, Micromax, China Mobile Phones etc may give problems such as No Sound from Speaker.

There can be different symptoms, reasons and solutions to identify, solve and fix the problem.

Following are some of the Basic Solution and Ways on How to Solve and Fix Mobile Cell No Sound from Speaker Problem:

No Sound in Mobile Cell Phone

No Sound in Mobile Cell Phone

  1. Check if the No Sound from Speaker problem happens always or during certain condition. Do functionality test by dialing the code – *#0*# to verify if there is any parts problem or not.
  1. If the sound problem happens always then check the speaker and the mic.  If any of them is damaged then replace it.
  2. If the speaker sound problem happens on certain conditions or situation the upgrade the Software / Operating System (OS) to the latest version.
  3.  For the earphone sound problem, check for any dust in ear-jack.


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Mobile Phone Blank LCD Screen or No LCD Indication Problem and Solution

There are situation when a mobile cell phone of any brand including Samsung, Nokia, LG, iPhone, Micromax, China Mobile Phones etc may give problems such as No LCD Indication or Blank LCD.

There can be different symptoms, reasons and solutions to identify, solve and fix the problem.

Following are some of the Basic Solution and Ways on How to Solve and Fix Mobile Cell Phone Blank LCD or No LCD Indication Problem:

Mobile Phone Blank Screen

Mobile Phone Blank Screen

  1. Power ON the Mobile Phone and Check if Sound is coming from the speaker or not.
  2. If booting sound comes from the speaker the check the LCD Assembly Status.
  3. If the problem is still not solved then upgrade the Software / Operating System (OS) to the latest version.
  4.  If the problem is not solved then you may have to replace the LCD. The LCD may be damaged.



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Mobile Phone No Network Signal Problem and Call Drop Problem and Solution

There are situation when a mobile cell phone of any brand including Samsung, Nokia, LG, iPhone, Micromax, China Mobile Phones etc may problems such as No Network and Auto Call Drop.

There can be different symptoms, reasons and solutions to identify, solve and fix the problem.

Following are some of the Basic Solution and Ways on How to Solve and Fix Mobile Cell Phone No Network Problem and Call Drop Problem:

Mobile Phone Network Signal Problem

Mobile Phone Network Signal Problem

 

  1. Check the SIM Card. See if the SIM is OK or not. Insert the SIM Card in other mobile phone and see it the Network Problem and Call Drop Problem is still there or not.
  2. Also try to insert another SIM Card in the Same Mobile Phone which is giving the problem.
  3. If there is problem with the SIM Card then try to change or replace it.
  4. If the problem is still not solved then upgrade the Software / Operating System (OS) to the latest version. Also Rewrite the IMEI Number of the Mobile Cell Phone.
  5.  If the problem is not solved then you may have to change the Mobile Phone PCB.


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Mobile Phone Problem and Solution – Auto off, Freezes, Hangs, Slow Processing

There are situation when a mobile cell phone of any brand including Samsung, Nokia, LG, iPhone, Micromax, China Mobile Phones etc may problems such – Auto off, Freezes, Hangs, Slow Processing

There can be different symptoms, reasons and solutions to identify, solve and fix the problem.

Following are some of the Basic Solution and Ways on How to Solve and Fix Mobile Cell Phone Auto off, Freezes, Hangs, Slow Processing Problem:

Mobile Phone Problem

Mobile Phone Problem

  1. Check downloaded applications and note when the problem happened or is happening.
  2. Check and note is the problem is happening when a certain app or application is running.
  3. Remove he application that is causing the problem and see if the problem is solved or not.
  4. If the problem is still not solved then factory reset the mobile cell phone and update the software / operating system (OS) of the mobile phone of smartphone.


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Mobile Phone Battery Problem and Solution – Low Battery, Battery Drains Fast, Battery Backup Low, Battery Not charging

There are situation when a mobile cell phone of any brand including Samsung, Nokia, LG, iPhone, Micromax, China Mobile Phones etc may give battery problems such – Low Battery, Battery Drains Fast, Battery Backup Low, Battery Not charging etc.

There can be different symptoms, reasons and solutions to identify, solve and fix the problem.

Following are some of the Basic Solution and Ways on How to Solve and Fix Mobile Cell Phone Battery Problem:

Mobile Phone Battery

Mobile Phone Battery

  1. Check the battery or charger to check if there is any problem there. You have to check the battery connector and charger plug.
  2. Check if there is any dust in the connector or any pin is broken or not. Also check for any corrosion in contact and plug. Clean the points using IPA or cleaning swabs. Make sure to use ESD-Safe Tools only.
  3. Check the Interface Connector to see if there is any dust or not. If there is dust then clean or replace the interface connector as required.
  4. If the battery problem is not solved then upgrade the software / operating system (OS) to the latest version.
  5. If the problem is still not solved then check the Mobile Phone PBA current consumption.
  6. Check for any short circuit.
  7. If there is serious problem at the Board Level then it is better to replace the whole Logic Board of the Mobile Cell Phone.


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Mobile Phone Heating Problem and Solution

There are situation when a mobile cell phone of any brand including Samsung, Nokia, LG, iPhone, Micromax, China Mobile Phones etc may get heated. This can happen inside the mobile phone of on the body on the mobile cell phone. There can be different reasons and symptoms of this heating problem. Different reasons will have different solutions.

Following are some of the Basic Solution and Ways on How to Solve and Fix Mobile Cell Phone Heating Problem:

  1. Check if the mobile phone gets heated when a particular application is running or the heating happens always. Check the heating point and running application status with normal status.
  2. Upgrade the mobile phone software / operating system to the latest OS. This may solve the heating problem.
  3. Many smartphones like Samsung Galaxy series, Nokia Smartphones, iPhone and Blackberry and even China Mobile Phones get heated if too many applications are running at the same time. This is because the processor has to do too many jobs at the same time. Close all the applications and try to run 1 application at a time to avoid mobile phone heating problem.
  4. If heating happens then there is some internal hardware problem. Most Mobile phone service centers and mobile phone repairing experts like me will change the PCB or Logic Board to solve the heating problem.


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Mobile Cell Phone Repairing | Mobile Phone Repair Guide, Help, Tips, Pictures, Videos, Hardware, Software Solution Mobile Phone Repairing | How to Repair any Mobile Cell Phone including Nokia, Samsung, Motorola, China Mobile Phones, Sony Ericsson, LG and all other Mobile Phone. Includes Mobile Cell Phone Repairing Photos and Diagrams, Repairing and Service Tips, Tricks and Solution for Problems like – Speaker or Earpiece, Headphone, Mic or Microphone, Signal Problems like No Network, Charging Problem or Mobile Phone Not Charging, Motor or Vibrator, Ringer or Buzzer, Camera, Display, Screen, PDA, LCD, Power Button, Bluetooth, Infrared, Antina or Antenna Switch, Hand Free , Key Pad Not Working, Joy Stick Fault, Insert SIN or No SIM, Light Problem, No Power or Set Dead. Also included is How to Load Software (Flashing) to any Mobile Phone and Other Hardware and Software Problems and Solution.

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