How to repair a mobile phone and maintenance steps [detailed steps]

  If something goes wrong with your phone, what will you do, send it to a repair station? Or do you save money and labor for dozens of minutes? Or you will worry that you will break the phone, but in fact, as long as everyone masters some essentials, the operation Be bold and careful when it comes to your phone, then doing some simple repairs for your phone is not as difficult as you might think. Today, I will tell you how to repair your mobile phone by yourself based on the experience summed up by the models I have disassembled.

  How to repair mobile phone and maintenance steps

  Dismantling items: screen and back shell

  Maintenance goal: replace the screen or back case Considering that many people will refuse to disassemble the mobile phone, according to common sense, I should first introduce some simple disassembly steps for you to enhance your confidence in doing it yourself. However, according to the disassembly steps of most mobile phones, the first step is to disassemble the screen or back shell of the mobile phone, and this process is generally the most difficult step in the entire disassembly process. But fortunately, as long as we master the method, we can easily and safely get through this difficult step.

  Ready to work

  Shut down, then remove the sim card Some people may ask, why do we need to remove the screen or the back cover first? Because we want to see the inside of the machine or replace the screen, we can only start with these two parts. But before dismantling these two parts, I will do this one step, first shut down, and then remove the Sim slot. Shutdown is to power off the device and avoid short-circuiting during disassembly. Separating the Sim card slot is to prevent the disassembly from continuing because it is stuck between the fuselage and the motherboard during the disassembly process. (Although I often forget this step, I realized that I didn't remove the Sim card slot when the motherboard stuck and couldn't get it out.)

  Observation structure

  After completing the two preparations, we will observe the structure of this mobile phone and speculate on the fixing method of the screen or the back shell and the fuselage, because only by knowing how they are fixed can we know how to disassemble it. If you can find the disassembly article of the machine on the Internet, then this step can basically be ignored. Because the general article will tell you how the screen or back shell is connected to the fuselage.

  Dismantling by hand

  The next step is the hands-on part. Usually the screen or back shell is fixed in three ways. According to the difficulty of disassembly, it can be divided into screw fixing, strong double-sided tape fixing and snap fixing. Adopt three fixing methods, such as the iPhone 6S. Since screw fixing cannot undertake the fixing task of the screen or the back shell alone, it is generally combined with the latter two. After understanding the fixing methods, the next step is to remove these fixings. You just need to remember to disassemble them in the order from easy to difficult. That is to say, first remove the screws, then separate the strong double-sided tape to fix it, and finally separate the clips to fix it.

  Steps to separate the screen or back case:

  1. Unscrew: Disassemble the screw with the corresponding screwdriver.

  2. Degumming: Use a hot air gun or a hair dryer to assist in degumming. How many sticks are needed to expand the gap? The strong double-sided adhesive needs to be heated with hot air or a more common hair dryer for about 3 minutes before dismantling, because after heating, the viscosity of the adhesive will be After heating, use a suction cup or a knock stick to open a gap on the screen or back shell, then the first stick remains inserted, and then the second stick is used to continue to expand the gap , and then add a third or even a fourth knock stick at a certain node. During this period, if you encounter a part that is difficult to degumming, continue to heat it and then knock it open. Try to use a thin and flexible knock rod. The thinner the stick is, the easier it is to insert into the gap, and the more flexible the stick is, the less likely it will damage the screen or glass.

  3. Buckle tripping: The principle of the fixing method of the buckle is very simple, that is, there is a convex point on one side and a concave point on the other side, and when the two are overlapped, a high fixing strength can be achieved. Unfortunately, it is precisely because of this high fixing strength that it is extra laborious to disassemble it. Because it can't reduce the fixing strength like heating double-sided tape, usually we can only use a more brutal way to open this fixing method, that is, use a stick to forcefully insert it between the gaps of the fuselage, so that it produces a There is a gap, and you can hear a "click" sound from the buckle inside, indicating that it has tripped. If you can go through this step smoothly, then the next step will be very easy. You just need to continue to use the stick to slide along the gap like the sides of the fuselage, and then you can hear the sound of the buckles blurring one after another, as if applauding and celebrating Your disassembly at this step is about to be successful. Finally, when the back case is completely separated from the fuselage, there is usually a fingerprint module fixed on the back case. As long as the connection between the motherboard and the fingerprint module is disconnected, and the fingerprint module is separated, we can replace the new back case. For the screen, if we just throw out a few cables to connect to the motherboard, we just need to disconnect and replace the already prepared screen module in the same way.

  ☉Summary of maintenance knowledge:

  1: Before disassembling the phone, remember to turn off the phone and take out the sim card

  2: If the original fixed with double-sided tape is particularly sticky, heating can be used to reduce the stickiness.

  3: If the buckle is very tight, don't hit it hard with a stick, but use a plastic stick to knock it open, because the rigidity of the plastic stick is weak, and it is not easy to damage the screen or the frame of the fuselage. Although lithium batteries can achieve very high battery capacity, due to their limited service life, the capacity will decline significantly after one or two years of use. However, if other parts of your mobile phone are intact at this time, it is believed that many people will feel heartache just because of the battery. Why don't you try to replace the battery? Dismantling project: battery maintenance goal: repair the power failure caused by the virtual connection of the power cord; preparation for replacing the battery: In the previous step, we have separated the back cover or screen of the fuselage, see When it comes to the internal structure of the fuselage, at this point, we can do many things, such as separating the camera, removing the screws to separate the motherboard, separating the speakers, and of course removing the battery, but before all these steps, we must make sure to complete one The only thing is to disconnect the battery power cable. Although it is turned off at this time, because the power supply is still connected to the circuit, the circuit is still charged, and many of our metal tools and fingers are conductive and have static electricity. The motherboard crashes. So the next step is to separate the connection between the battery and the motherboard. The battery and motherboard of many mobile phones are directly connected by snaps, and the cable can be disconnected as long as it is lifted with an insulating stick. If the cable is not fixed, when the machine is dropped or bumped, it may cause the line to be connected or disconnected, and the machine will not be able to turn on. If you encounter this problem, just disassemble the machine to see if the power cord is separated, if so, press it back. Some manufacturers have noticed this, so they will design a metal fixing piece on the power button to fix the power cable interface.

  Replacement battery:

  Generally speaking, when the battery is disconnected from the cable of the motherboard, the battery is completely an isolated individual, but it is not so easy to remove it. At present, the most common way to fix batteries is to use strong double-sided tape. However, compared with the amount of double-sided tape on the screen, the battery is generally used much more. However, the battery is a dangerous part. Excessive pressure will damage the battery, so on the one hand, the viscosity increases, and on the other hand, the material itself becomes more fragile, which makes disassembly a lot more difficult. What should we do? If you want to separate the battery fixed by the strong double-sided tape, you have to put some effort into disassembling the battery with the double-sided tape. Yes, and then use a flexible and sturdy thin object such as a bank card to push it inward from the bottom of the battery a little bit, and then the battery is degummed. Why not use a tilting stick? Because the battery is easily deformed, and it needs a fulcrum to tilt, and the battery is surrounded by delicate and fragile parts. The bottom of the battery is the screen, and neither side can withstand the toss. The battery can be easily separated by pulling out the pull-out glue. Nowadays, manufacturers have gradually realized the urgent requirement of people to replace the battery. Although the official still claims that the battery cannot be removed, the fixing method of the battery is not all strong double-sided adhesive tape. A more easily disassembled fixing method called pull glue began to increase. As the name suggests, the pull glue can be degummed by pulling it out by hand. Generally, there is a small handle next to the battery fixed by pull glue. Even if there is an angle, don't be too big, because if you don't follow this technique, the glue will break almost 100%, and if the break point is under the battery, then congratulations, you are ready to lift it, which is stronger than strong double-sided tape. Battery! (Don't ask me how I know, just think about it is two lines of tears) When the old battery is successfully separated, we should really cheer for ourselves, the two most difficult parts of the disassembly process are over

  Summary of maintenance knowledge:

  1: After separating the back shell or the screen, the first thing to do is to disconnect the power cable to prevent static electricity from penetrating the circuit or short circuit.

  2: Separating strong double-sided tape to fix the battery can be properly heated, use the card to shovel off the glue at the bottom, and try to avoid using a hard stick. The reason why the button list is pulled out to one page is because there are so many people who have broken this part. After all, this is a part we often use. The bad position is generally on the part of the "pot carrier".

  The above is a brief introduction to the screen, back shell, battery disassembly and maintenance tips, everyone may say that it is so simple, yes, in fact, as long as you are bold enough, then you will definitely be able to have enough Grasp the dismantling of the vast majority of mobile phones and even tablets on the market. If you haven't tried it yet, you might as well go to the second-hand mobile phone market to buy a few cheap mobile phones to practice your hands first. I believe you will quickly master the skills of dismantling, but in the end, I will give you a small suggestion. If it is serious, it is best to go to a professional mobile phone repair station for a professional inspection.