Modern smartphones like the Xiaomi Redmi Note 9 Pro are characterized by high density of interior elements, which makes them a difficult but feasible process. The need for disassembly can arise for various reasons: broken display glass, battery wear or moisture getting inside the case. Understanding the design of the device is the first and most important step to successfully restore the gadget without going to the service center.
Before you start dismantling, it is important to be aware of the risks. Any interference with the design of a smartphone can damage the plumes or the case if you act carelessly. In this article, we will look at each step in detail, from removing the back cover to turning off the motherboard, to minimize the likelihood of errors.
The process requires not only theoretical knowledge, but also a specialized tool, and without the right tools, there is a high risk of screws being ripped off or brittle plastic latches being damaged, and we will then describe in detail the work site preparation and the necessary set of equipment for safe operation.
The Redmi Note 9 Pro cannot be disassembled without the right tools, and the use of improvised tools such as knives or pins often results in permanent damage to the body and internal components. Professional approach begins with the right tools that ensure accuracy and safety.
You'll need a set of precision screwdrivers, because the screws in modern Xiaomi smartphones have different hat sizes. Also an indispensable assistant will be plastic mediators or blades that do not scratch the surface and do not conduct electricity.
- 🛠️ Set of screwdrivers (cross-crosses) PH000, PH00 flat)
- 🧤 Plastic blades and mediators for opening the body
- 🌡️ dryer or warmer
- 📦 Magnetic screw-sorting mat
⚠️ Attention: Before starting work, be sure to turn off the device and remove SIM-Working with the battery on can lead to short circuits when carelessly touching the contacts of the plumes.
The organization of the workspace is critical: light must fall evenly, without glare, to see fine details well, magnetic mat will help not to confuse screws of different lengths, which is especially important when assembled, because screwing a long screw into a short hole can damage the board.
Removal of the back cover and dismantling of protective elements
The first step in any deep diagnostic is to remove the back panel. In the Redmi Note 9 Pro, it is attached to a two-part glue around the perimeter of the case. To separate the glass from the frame, you need to evenly warm the edges of the device. Don't hold the hair dryer too close so as not to overheat the battery or display.
After heating, insert a thin suction cup or plastic spatula into the bottom corner of the device. Carefully, without any sudden jerks, drive the tool along the perimeter, cutting the adhesive layer. If you feel strong resistance, warm up the area again. Sharp movements can lead to cracks in the glass of the cover.
Once the lid is removed, you will see the interior layout, immediately notice the massive main camera module and the protective plate covering the plumes, and at this stage it is important to be extremely careful, since thin antenna wires may be under the lid.
Features of the glue layer
The glue in Xiaomi smartphones polymerizes over time and becomes very hard. If the lid is removed with difficulty, do not use force, it is better to add a little more heat. In some cases, the old glue can be pulled with threads that need to be carefully removed with tweezers so that they do not get into the connectors. Disabling the battery and removing the protective plate The most important step in ensuring safety is to turn off the power source. Before touching any other components, you need to find the battery connector on the motherboard. In Xiaomi Redmi Note 9 Pro, it is usually located under a metal protective plate in the center or bottom part, they can have a number of the screw, they can be attached to the number of the mount. After removing the plate, carefully disconnect the battery plume, slightly lifting it up with a plastic tool, this will turn off the device and prevent accidental short circuit, then unscrew the screws that fix the main motherboard and charging board. Often these boards are connected by a wide plume, which also requires careful handling.When removing metal screens that cover the processor and memory, use a suction cup or a special tool to avoid damaging the components underneath them. 🔋 Disconnect the battery plume first. 🔩 Sort the screws by the place of their twisting. 🔌 Turn off all visible display and camera plumes After the battery is turned off, you can safely continue working. If you're planning to replace the screen, now you need to disconnect the display and touchscreen plumes. They can be located in different places depending on the board revision, so carefully examine the markings on the connectors. The motherboard and camera modules extraction in the Redmi Note 9 Pro is the heart of the device that requires the most careful attitude. After turning off all the plumes and twisting the fasteners, the board can still be held by camera modules or speakers. The main camera often has to be removed first, since it can block access to the board. The main camera module is quite large and can be attached to the glue or sit tightly in the landing place, the fastener of the screws, but it is very easy to avoid the old circuit board. Static electricity can harm electronics, so it is recommended to use an antistatic bracelet or periodically touch a grounded metal object. Component mounting type Risk of damage Tool Glue High (cracks) Fen, suction battery Trail + glue Medium (puncture) Scapula, Hair Screen Clay + plumes Very high Suction, Camera Median (lens) Tweezer After removing the board, access to the lower plume Redmi, the suction battery, this is often connected to the battery with the main charger, it often from the replacement of the battery with the battery, it is from the main charger, and replaces the battery. Trying to extract it without heating can lead to deformation or, worse, puncture: heating the back of the case (if the lid is removed) or using special chemical adhesive solvents will make it easier. Use a thin plastic card or a special fishing line to carefully cut the adhesive layer under the battery. The movements should be smooth, without jerking. If the battery is swelling, treat it with extreme caution, as damage to the shell can lead to fire. When installing a new battery, be sure to remove the remnants of the old glue from the frame of the case.The surface must be clean and defatted for the new battery to be securely fixed.Use special adhesive tapes B-7000 Or electronics repairs, and after you install a new battery, don't be in a hurry to seal the case. First, check the device's performance by plugging in the display plume and turning on the smartphone. Make sure the charging goes, the touchscreen responds, and the sound is present. Only after successful testing can the final assembly begin. The device assembly and functionality check The Redmi Note 9 Pro build is done in reverse order, but requires even greater care. Make sure that all the plumes are latched to a characteristic click. An insufficiently tightly inserted connector can cause a broken module or periodic malfunction of the phone. Particular attention is paid to stacking the plumes. They are done in reverse order, but require even more care to make their plates to appear in full swing or be in the display. 🔍 Check the cleanliness of the connectors before connecting 🔩 Swirl the screws cross-cross for a uniform pinch 🧪 Test all sensors before the final sticking. ⚠️ Warning: Do not use superglue (cyanacrylate) to fix the lid or battery. Its vapors can settle on cameras and sensors, causing them to cloud and fail. Use only specialized adhesives for electronics. The final step is to apply a new adhesive layer to the frame and install the back cover, spread the adhesive evenly, or use the pre-made adhesive tape around the perimeter, press the lid and lock the device with rubber bands on the perimeter. 15-20 I'm going to take a minute to get the primary glue polymerization. 9 Pro without a hair dryer? Theoretically possible using special adhesive solvents, but it significantly increases the risk of damage to the glass back cover. The dryer provides more controlled and safe heating by softening the glue without excessive effort. What to do if the plume breaks during disassembly? If the plume of the display or the main camera is damaged, the entire module is most often required to be replaced. Repair of the plumes themselves at home is impossible due to the microscopic size of the contacts. For charging plumes or buttons, you can find donor parts. Should the battery be completely discharged before disassembly? Yes, this is a standard safety measure. Discharge of the battery to a level of 5-10% reduces the risk of combustion from accidental damage to the battery during the battery.