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REPAIR AND MAINTENANCE OF MOBILE CELL PHONES Mobile Phone Repair and Maintenance Acknowledgements This course was drafted at a. Feb 20, Mobile Phone Repairing PDF Book Free Tutorial & Guide. emmc Repair Done - IMET Mobile Repairing Institute IMET Mobile Repairing Course. Lumia Cell Phone pdf manual download Iphone Repair, Mobile Phone .. repairing institute Meerut, offers advance mobile repairing course in Meerut.
There are four major forms of mobile phones, namely: Let us look at each form in further detail starting with the bar phone.
The Bar Phone A bar phone is also known as the slab, block, or slate phone. The name is derived from the rough resemblance to a candy bar in size and shape, see Figure 1 below.
Figure 1: A bar phone The Touch screen Phone A touch screen, or slate phone is a subset of the bar form. Like the tablet computer, a touchscreen phone has minimal buttons and instead relies on an electronic visual display known as a touch screen. Figure 2: Touch screen phone Figure 2 shows a picture of a touchscreen phone.
The hinges allow the phone to flip open and fold to close in order to become more compact. When flipped open, the phone's speaker and microphone are placed closer to the operator's ear and mouth, thereby improving usability. Figure 3: A flip phone The Slider Phone A slider or slide phone is composed of usually two, but sometimes more, sections that slide past each other on rails. It usually has a display segment which houses the speaker and screen, while the segment that slides in and out contains the keypad or keyboard.
The sliding form factor allows the owner to take advantage of a full key board without sacrificing portability.
Step by Step Mobile Phone Repairing Tutorial
Figure 4 Figure 4: A slider phone shows a picture of a slider phone. We hope you now understand the various types of mobile phones. Let us now look at the potential hazards that are associated the repair of a mobile phone. Therefore, as you embark on mobile phone repair, you should be aware of all the potential hazards and how to prevent them.
What is a hazard?
A hazard is anything that has the potential to cause harm to yourself or those around you. Write down the meaning of the terms in the following activity.
Activity 2: Meaning of terms associated with hazards 5minutes Write the meaning of the terms in the left hand column Term Meaning Flammable Corrosive Toxic Fumes Compare your answers with those given at the end of this course.
Let us now look at the various types of hazards that you could encounter when repairing or maintaining a mobile phone? These are listed in Table 1 together with the preventive actions that you could take to avoid them.
Table 1: Potential hazards during mobile phone repair and their prevention Hazard Preventive Actions Burns Use of well insulated tools Use of gloves Keeping the soldering iron in the right place Unplugging equipment when not in use Pricks by sharp objects Appropriate storage of equipment Proper disposal of sharp objects Use of appropriate tools and equipment Environmental pollution Proper disposal of electronic wastes Trailing electrical cables Make sure electrical equipment is unplugged while not in use Safe storage of cables Falls Keep all tools, bins etc.
It is important for you to know the parts and understand their functions so that you can easily diagnose and solve problems. How many parts of a mobile phone do you know?
Take a minute to think about it and then complete the following activity. Activity 3: Parts of a mobile phone. A conventional mobile phone is made up of many parts. Table 2 below explains the functions of the main parts. Table 2: Parts of a mobile phone and their functions Parts of a mobile cell phone Functions Used for inputting or entering data into the phone. It is connected to the CPU to receive following signals: Stores the software and other programs installed in the Flash IC mobile phone Charging IC Takes the current from the charger and charges the battery CPU Controls all sections of a mobile phone Receives and transmit radio frequencies and helps the Antenna phone to connect to the cellular network Figure 5 below shows a printed circuit board PCB of a mobile phone showing the different internal parts.
As you can see from this diagram the PCB is divided into two parts, the network section and the power section. The network section controls the incoming and outgoing phone calls, while the power section controls the memory and power related functions of the phone. Figure 5: Parts of a mobile phone We hope you now know the different parts of a mobile phone and their functions.
Make sure that you learn them well and are be able to locate them easily before you move on to the next section. Let us now look at the tools that you need to repair mobile phones. It is important to select the best tool that enables you to repair the phone easily and comfortably. Before you continue reading complete the following activity. Activity 4: Factors to consider when choosing mobile repair tools 5 minutes List three factors that you would you consider when choosing mobile phone repair tools?
Factors to Consider When Choosing Mobile Phone Repair tools When selecting tools and equipment for repairing mobile cell phones, you should consider the following factors: Cost 2. Brand 3. Availability 5. Suitability Tools for Mobile Phone Repair Below are the tools and equipment needed for mobile phone repair. Soldering Iron: Used to solder small components like capacitor, resistor, diode, transistor, regulator, speaker, microphone, display etc.
A 50 watt soldering iron is good enough for most mobile phones repairing job. Figure 6: Soldering iron 2. Figure 7: PCB holder 3. Solder Wire: Figure 8: Solder wire 4.
Thinner or PCB Cleaner: Figure 9: Jumper Wire: This is a thin laminated or coated copper wire used to jumper from one point to another on the track of a mobile phone during repair. Figure Jumper wire 6. Point Cutter: It is used for cutting Figure Point cutter 7.
Blade Cutter: This is used to remove lamination from jumper wire. It can also be used for several other purposes. Blade cutter 8. Nose Cutter: Nose Cutter 9. Precision Screwdriver: It is used to remove and tighten screws while assembling and dissembling a mobile phone. Precision screwdrivers of sizes T4, T5, T6 and forehead are good for most mobile repairing job.
Precision screwdriver These are needed to hold electronic components, ICs, jumper wire etc. These are used for cleaning the PCB of a mobile phone when it is being repaired. It is important to download only ESD-Safe cleaning brushes. Brushes It is used to test and check the readings of various parts and components of a mobile phone. Digital Multimeter Source: Hot Air Blower: It has control to regulate or manage temperature and flow or hot air.
Always download a good quality ESD-Safe hot air blower. Hot air blower Battery Booster: It is used to boost the power of battery of a mobile phone. Screwdriver Kit: It has several screwdrivers of different shapes and sizes to disassemble and assemble a mobile phone. Assorted screwdrivers It is used to see a magnified view of PCB or electronic components. These are available in different zoom options. Many microscopes can also be connected to a computer or a monitor.
Microscope Test JIG Box: This device is used to diagnose and find fault or problem in a mobile phone. It helps the mobile phone to work and function normally outside its case.
This helps to test and check voltage and other test points on the PCB. In simple words it helps the mobile phone to work without battery. Test JIG box Battery Tester: This device is used to test and analyzethe status or condition of the battery of a mobile cell phone. Cleaning Sponge: Cleaning sponge Solder Paste: The solder paste is a low melting metal allow used to join together metal work pieces.
It has a lower melting point than the metal work pieces. Solder paste LCD Tester: Used to check whether the LCD screen of a mobile phone is faulty or not. LCD tester You now know the main tools that are used to repair a mobile phone. In the next topic we shall discuss how to disassemble and assemble a mobile phone. To disassemble is to take something apart or to break it down into pieces. What is to assemble? To assemble is to fit together all the separate pieces in order to form one whole.
Before you continue reading, complete the following activity. Activity 5: Disassembling a mobile phone 5 minutes. What steps would you follow when disassembling a mobile phone? Write them down in the space provided below 1.
Switch off the phone 2. Remove the battery cover 3. Remove the battery, SIM card memory card if any 4. Remove all the screws from the phone 5. Lift back the cover with the help of a flat screwdriver 6.
Remove the strips buzzer strip, display, camera, volume and speaker button strips 7. Remove the antennae wire from the outside 8. Remove the motherboard and vibrator.
To successfully disassemble a phone, you need to understand the various internal sections of a mobile phone and how they are connected to the CPU. Let us look at that next. Internal Parts of a Mobile Phone Table 3 below outlines the main sections and how they are connected. Table 3: In most phones the micro SD card holder is Memory card section connected through a 8-pin socket. The memory card section is found inside the CPU In modern mobile cell phones which have a separate ear speaker, the speaker is directly connected to the CPU.
Some mobile phones have audio IC in the audio section, while others have audio amplifier. LCD Backlight in mobile cell phones is made according to the series circuit. Positive power supply is given to this section directly from the positive end of the battery.
Charger and system interface connector is made together in most modern mobile cell phones. Regulator section is made separately for the Battery Charging Section battery charging section.
In some mobile phones, the battery charging section is made inside the Power IC. The hands free jack, hands free MIC, speaker signal component and hands free audio amplifier are Hands free Earphone Section: Hands free symbol is displayed after connecting the Hands free jack.
Fix the vibrator strips of speaker and volume button 2. Fix the motherboard 3. Connect the antenna with wire 4. Place the camera and connect it 5. Place the buzzer 6. Put the camera cover 7. Make sure that the LCD is working before you place the screen 8.
Put battery and battery cover So far you have learnt about the hazards of mobile phone repair, the parts of a mobile phone, the tools to use and how to assemble and disassemble a mobile phone. Now let us look at how to diagnose and repair a mobile phone. Let us start by looking at the skills that you need to have to be able to diagnose and repair a mobile phone. Skills Needed to Diagnose and Repair a Mobile Phone Before you can diagnose and repair a phone, there are some skills that you need to learn.
These skills are: Soldering Soldering is a process in which two or more metal items are joined together by melting and flowing a filler metal into the joint. The filler metal has a relatively lower melting point. Prepare the following materials: Plug and pre-heat the soldering iron. Heat both items at the same time by applying the soldering iron to the copper pad and the component lead.
Continue heating and apply a few millimeters of solder. Remove the iron and allow the solder joint to cool naturally. It only takes a second or two to make the perfect joint, which should appear shiny. Pokemon Go and Ingress Prime players can reserve their existing Niantic game handles on the new Harr Be the first to know about the hottest apps with Download's Android Apps newsletter. I am aware I can opt out at any time.
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Cut jumper wire to desired length and remove its lamination using blade cutter. Hold one end of the jumper wire and solder it to one point of the faulty circuit track. Use a good quality tweezers to hold the wire and good quality of soldering iron and solder wire to solder. Now hold the other end of the jumper wire and solder to the other point of the track 7.
Using a multimeter check the jumper. Page 26 Mobile Phone Repair and Maintenance The Figure 31 Below shows jumper settings in of the jumpers may look like on your motherboard. In this example, the jumper is the white block covering two of the three gold pins.
Also, next to the pins is a silkscreen description of what the pins do, in this case when pins are jumped the computer is operating normal, when are jumped it is set into configuration mode, and when open the computer will be in recovery mode. Figure Jumper Setting You now know the skills that you need in order to diagnose and repair a mobile phone.
Let us now learn how to diagnose and repair mobile phones. Mobile Phone Diagnosis There are two methods that you can use to find out faulty or damaged components in a mobile phone. During cold testing do not power the phone from any equipment. Use the diode range and beep sound from the multimeter to find fault in the mobile phone. During the fault-finding and repairing process of each part, component or section, you should receive the following correct values: 1.
Battery Connector Tip Sense : above. Display Connector Supply Pins:. Display Connector Signal Pins:. Camera Connector Supply Pins:. Camera Connector Signal Pins:. Key Tip Row and Column :. Charger Connector Tip:. Vibrator Motor Connector:. Micro Card Connector Pin 1,2,3,5,7, The fault is found by powering the mobile phone with a battery which has a DC power supply.
During hot testing, the voltage of different part or sections should be as follows all values in Volt : 1. Display Connector Supply Pins: 1. Display Connector Signal Pins when working:. Camera Connector Supply Pins: 1. Camera Connector Signal Pins when working:. Charger Connector Tip: 5 to 6 Vibrator Motor Connector Tip when Working: 1.
Micro Card Connector Pin 1,2,3,5,7,8: 0 to 2. The following statements describe either the cold testing or hot testing methods used for diagnosing mobile phone problems.
Write the correct diagnosis method against the statement that best describes it. Description of diagnosis method Name of Diagnosis method 1. Checks the value of resistance using a multimeter to diagnose a problem 2. Checks the voltage of damaged part by giving power to the mobile phone using a batter of DC power.
The phone is not powered during testing 4. Fault is found by powering the mobile phone with a battery Compare your answer with what you read in the following section. You now know how to diagnose a fault in a mobile phone using the hot and cold testing method. In the next section we shall learn about the common mobile phone faults. A fault is a defect a failure in a circuit or an electronic device. What causes faults or failures in mobile phones? Solutions to Battery charging faults 1.
Change the charger and check. The voltage must be between 5 and 7 Volts. Clean, resold or change the charger Connector. If the problem is not solved then change the battery and check again 5. Check the voltage of the battery connector using a Multimeter.
The voltage should be between 1. If there is no voltage in the connector check the track of the charging section. Refer to the diagram of the particular model of the mobile phone.
If the problem still persists, check the fuse, coil and regulator one by one and change the faulty part. If the problem is still not solved then heat or change the charging IC. Finally heat, re-ball or change the Power IC. Check the battery connector and charger plug to see if there is any problem. Check if there is any dust or corrosion in the connector or any broken pin. Clean the points using IPA or cleaning swabs.
Check the Interface Connector to see if there is any dust. If there is dust clean or replace the interface connector. If the battery problem is not solved then upgrade the software or operating system to latest version 5. Check for any short circuit. If there is serious problem at the board level then it is better to replace the whole Logic Board of the Mobile Cell Phone. Solutions to Network fault 1. Manually search for the network. Repair or replace it. If the network resumes after manual search but the home network cannot be selected, then there is a problem with the PFO.
Repair or change the PFO. If the Network gets disconnected during phone calls then you should repair or change the Network IC. Clean the antenna tips and point. If the network problem persists, heat or change the 26MHz Crystal Oscillator. If the problem is still not solved then heat or change the Antenna Switch. You can also jumper if the Antenna Switch is not available.
Heat, re-ball or change the Network IC. Heat, re-ball or change the Power IC. Heat, re-ball or change the CPU. Take Note: If the problem is not solved by hardware interventions, then reload the PM File in the mobile phone using the software box. Page 32 Mobile Phone Repair and Maintenance d Network Signal and Call Drop Problem If a mobile phone is having network problems and dropping calls, then you should use the following steps to solve it: 1.
Check the SIM Card. Alternatively, try to insert another SIM card inside the mobile phone that has the network problem. If the problem is caused by the SIM card, then you should change or replace it. If the problem is still not resolved then upgrade the operating system to the latest version. If the problem is not solved then you may have to change the mobile phone.
Mobile Phone Overheating A mobile phone may overheat either inside or on the body. To solve this problem you should proceed as follows: 1. Check if the mobile phone overheats when a particular application is running or if the overheating happens all the time. Upgrade the mobile phone software operating system to the latest version.
This may solve the overheating problem. Close all the applications and try to run 1 application at a time 4.
If overheating persists, then there is some internal hardware problem. Earpiece or Ear Speaker Problem The Earpiece or speaker is the electronic component or part that helps us to listen to sound during a phone call.
See Figure 27 for a picture of an ear speaker. How to Solve Earpiece or Speaker Fault 1.
Check the speaker volume during a phone call. If speaker volume is fine, then check the earpiece by keeping the multimeter in buzzer mode. If the problem is not solved then check the Circuit Track of the earpiece section. Do jumper wherever required.
Mobile Phone Repairing Tutorial, Tips, Free PDF Download
If the problem is still not solved then heat, reball or change the CPU. Take Note: If the sound is low or not clear during a phone call, then you should change the speaker. Ringer Problem A Ringer is any type of electronic component that rings or plays a loud sound. It is also called the I.
F Speaker, buzzer, melody, etc. Figure 28 shows a picture of a ringer. Check the ringer settings in the mobile phone. Check Ringer volume and silent mode. If the problem is not solved then open the mobile phone and clean the ringer point and ringer connector. If the problem is not solved then check the ringer by keeping the multimeter in buzzer mode.
If the problem is not solved then check the track of ringer section. If the problem is not solved then check the Ringer IC.
Heat or change the IC. Vibration Problem The vibrator is an electronic device that generates vibrations. How to solve Mobile Vibrator faults 1. Check the Vibrator settings in the mobile phone.
If the problem is not solved then open the mobile cell phone and clean the vibrator tips and connector. If the problem is not solved then check the vibrator with the multimeter in Buzzer Mode. If the problem is not solved then check the track of the vibrator section. Page 35 Mobile Phone Repair and Maintenance 5. Microphone Problem The Microphone is an electronic component that helps to transmit sound during phone call.
How to Solve Microphone Fault 1. Check the Microphone settings. Figure Jumper Setting For Microphone 2. If all the settings are normal, then check and clean the Microphone tips and connector. If the problem is not solved then check the Microphone with the multimeter in Buzzer Mode. If the value is not in between that range, then change the Microphone. Note that only one side will give a value.
If the problem is not solved then check the track of the Microphone section. Do Jumper wherever required. If the problem is not solved then heat or change the Microphone IC. It is controlled by the CPU.
Clean the display tips and display connector. Resold the display connector 3. Change the display 4. Check the display Track. Resold or change the display IC. Heat, reball or change the CPU. Change the track to solve the problem. Figure 36 shows a diagram of series and parallel connections. Check the light settings.
If the settings are normal then resold all the LED. If the problem is not solved then change the display or the screen. Next check all the LEDs with the multimeter on Buzzer mode. If the LED is good then it will glow.
If the LED is faulty then it will not glow. Change the LED or jumper if required. If the problem is not solved then check the Track of the light section of the PCB and jumper if required.Note that your submission may not appear immediately on our site.
Motherboard The main board that holds electronic components of the system, CPU and memory, and provides connectors for other peripherals. Use a solder wick finely braided copper to wick away excess solder from a de- soldered connection.
Battery Connector www. Alternatively, try to insert another SIM card inside the mobile phone that has the network problem. How to unlock iPad when its linked with an apple account? Diagnose To identify the nature of a problem by examining the symptoms. Antenna Switch: If the network resumes after manual search but the home network cannot be selected, then there is a problem with the PFO. Why do Jumpering While repairing mobile phones, we find that certain faulty components are very difficult to get from the market.
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