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CELL PHONE REPAIR PDF

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Mobile Phone Repairing PDF Book - Looking for book on mobile phone repairing . Download this PDF book for free to learn mobile phone. Download course Mobile Phone Repair and Maintenance, free PDF ebook by Commonwealth of Learning on 49 pages. All you need to do is download the course and open the PDF file. The latest news and especially the best tutorials on your favorite topics, that is why Computer PDF is. Page 1. ;]n ÷df]a fOn kmf]g l/k]o / 6]lSgl;og. ;]n ÷df]a fOn kmf]g l/k]o / 6]lSgl;og. 5f]6 f Cell-Mobile REPAIR AND MAINTENANCE OF MOBILE CELL PHONES.


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Students can Start Their Own Business in Mobile Phone Repairing and Cell Phone Industry. Students can Work as a Technician in a Cell Phone Service Centre. here is a step by step information to starting a cell phone repair shop, get profitable tips according to experts and some websites list to learn free. Feb 20, Mobile Phone Repairing PDF Book Free Tutorial & Guide. Samsung mother board Iphone Repair, Mobile Phone Repair, Smartphone.

Used to Sponge: To Clean Tip ofSolder. Soldering Ironwww. To Desolder Screwdriver Kit: PCB Track. Identification of Card Level Parts. Fascia 2. Back Facia Facia Back Facia www. LED www. Charging Connector Data Cable Connectorwww.

Battery Battery Connector www. SIM Card SIM Card Connector www. Memory Card Memory Card Connector www. Camera Camera Connector www. Keypad Button Keypad Connector Display Display Connector www. Antenna PCB www. Identification of PCB1. Antenna Point: The point where anteena is connected is called anteena point.

Network Section: The section below anteena point and above power section is called network section. Anteena Switch: It is found in the network section. It is made from metal and non-metal. It has 16 points or legs. Identification of PCB4. In some mobile phones, the anteena switch is merged with PFO. It is present beside the antenna switch. Network IC: It is below or beside the anteena switch and PFO. Nokia , , , etc.

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Identification of PCB8. Power Section: This section is below the Network Section. Power IC: In some mobile phones there are 2 Power IC. In some sets there are 2 CPU. Flash IC: Identification of PCB Logic IC: Charging IC: Audio IC: Definition of Big Parts1. Antenna Switch: It is found in the Network Section of a Mobile Phone and is made up of metal and non-metal.

It searches network and passes forward after tuning. 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.

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: present in this section.

Hands free symbol is displayed after connecting the Hands free jack. Page 21 Mobile Phone Repair and Maintenance Assembling a Mobile Phone The following are the steps that you should take when assembling a mobile phone: 1.

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.

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. 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. Desoldering Desoldering is the removal of solder and components from a printed circuit board for troubleshooting, repair, replacement, and salvage. Figure Desoldering Steps in desoldering 1. Use a solder wick finely braided copper to wick away excess solder from a de- soldered connection. Apply the solder wick and use the soldering iron to the de-soldered connection.

The solder wick will draw the excess solder off the PCB pad. Testing a phone using a multimeter We hope you still remember that a multimeter is a device that is used to measure the voltage, current and resistance of various components of a mobile phone.

Plug your red and black probes into the appropriate sockets on your multimeter. Hold the probes against the resistor. Check the resistor value on the display.

Figure Using a Multimeter Take Note: Always turn off the power supply to your circuit before measuring resistance.

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To measure voltage you should follow these steps: 1. Plug the black test probe into the COM input jack. Plug the red test probe into the V input jack.

If the DMM has a manual range only, select the highest range so as not to overload the input.

Page 25 Mobile Phone Repair and Maintenance 4. Touch the circuit with the tips of the probes 5. Read the number in the display window and take note of the unit of measurement. Turn off power to the circuit. Cut or unsolder the circuit, creating a place where the meter probes can be inserted. Plug the red test probe into the amp or milliamp input jack, depending on the expected value of the reading. Connect the probe tips to the circuit across the break so that all current will flow through the DMM a series connection.

Turn the circuit power back on. Jumper setting Jumpering means to temporarily complete a circuit or to bypass a break in a circuit by making a connection from one point to another.

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A good conductor wire is used to make a jumper which by-passes the components and passes on a signal or supply line for further uses. When wire is used as a jumper, it must have some special specifications as required. These jumper wires can mainly be of two types i.

In the mobile phone insulated wires are used for jumpers. The length of a jumper depends on the two points connected in between. Why do Jumpering While repairing mobile phones, we find that certain faulty components are very difficult to get from the market. To repair such mobile phones the only immediate option is the use of jumpers.

By use of jumpers we will bypass the faulty components specifically. How to Jumper 1. Disassemble mobile phone and place it on a PCB holder. Using a multimeter, check track and find the fault or the missing track that need jumper.

Apply liquid soldering flux to the points where you need to solder jumper wire. 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:.

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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. Identification of Big Parts in Software Tools. Software Problems and Solutions. Identification of Small Partsin a Mobile Phone. AC: Alternate Current.

DC: Direct Current. IC: Integrated Circuit. RF: Radio Frequency. TX: Transmit Transmitting Section. Soldering Iron Soldering Station www. Electronic ComponentsWhile Soldering. Soldering Ironwww. PCB Track. Fascia 2.

Back Facia Facia Back Facia www. LED www. Charging Connector Data Cable Connectorwww. Battery Battery Connector www.

SIM Card SIM Card Connector www. Memory Card Memory Card Connector www. Camera Camera Connector www.Figure Jumper wire 6. It is also called Motor. Today people use mobile phones to stay in touch with friends and family, to share stories and photographs in social media, and to carry out financial transactions.

Fault is found by powering the mobile phone with a battery Compare your answer with what you read in the following section. Testing a phone using a multimeter We hope you still remember that a multimeter is a device that is used to measure the voltage, current and resistance of various components of a mobile phone.

This is the Light IC. It is below or beside the anteena switch and PFO. Change the track to solve the problem. Touch the circuit with the tips of the probes 5.

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