Replacing broken glass or battery on a smartphone often starts with removing the back panel, and in the case of the Xiaomi Redmi Note 9 Pro, this process requires special care due to the design of the case.The manufacturer used a glass back cover that is attached to the adhesive base around the perimeter, making the removal procedure more delicate compared to plastic counterparts. Any careless movement can lead to cracks or chips, so it is important to prepare the workplace and the necessary tools in advance.
Many users are afraid to start self-repairing a smartphone, considering it the lot of professionals, but with the right skill and quality tools, the task is quite solvable at home. The key factor of success here is the preheating of the glue, which softens the adhesive layer and allows you to safely separate the glass from the frame. In this article, we will discuss each step of work, paying special attention to the nuances that are often missed by beginners.
Tools and workplace preparation required
Before you start disassembling the Redmi Note 9 Pro, you need to assemble a full set of tools, as using inappropriate items can damage the body. You will need a dryer to heat the glue, a sucker for the primary lift of glass and thin metal blades or special maps to dissect the adhesive layer. Also remember to prepare isopropyl alcohol to help dissolve the residue of glue, and tweezers to work with small parts.
The workplace should be well lit and free of unnecessary items so that small screws or parts do not get lost. It is recommended to use a magnetic mat or section container for sorting fasteners, since the design of the smartphone uses screws of different lengths. If you twist a long screw into the hole for a short one, you can damage the internal components or the board itself.
☑️ Disassembly tools
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Use 99% isopropyl alcohol to clean surfaces, as it evaporates quickly and leaves no traces, unlike water or household chemicals.
The procedure of heating and softening the glue layer
Heating is a critical step, as heat treatment allows you to safely open the back cover without damaging it. Turn on the dryer at medium power and evenly warm the perimeter of the rear panel for 2-3 minutes, keeping the device at a distance of 3-5 centimeters from the heat source.
⚠️ Warning: Don't heat your smartphone too much - if the body gets so hot it's hard to hold in your hand, the temperature needs to be lowered.Excessive heating can cause the battery to bloat or the plumes to detach.
After heating, check the glue readiness by carefully trying to lift the edge of the glass with a suction cup. If the panel is difficult, the heating procedure should be repeated again, paying attention to the corners where the glue is usually the most. A properly heated adhesive layer will become elastic, which will allow the tool to slide easily inside the housing.
Temperature regime
Rear panel separation technique
Once the glue is softened, the suction cup should be fastened to the bottom of the back cover, closer to the center, and pulled upwards, creating a small gap, gently insert a thin mediator or plastic card into the resulting gap and start to guide it along the perimeter, cutting the glue layer. The movements should be smooth, without sharp jerks, so that the glass does not crack or the plume of the fingerprint scanner is damaged.
You should be especially careful at the top of the smartphone, where the camera modules and the motherboard connections are located. Do not enter the tool too deep, 2-3 millimeters enough to cut the glue, but do not touch the internal components. As you move gradually around, you will free the lid from the frame, after which it can be carefully removed.
- 🔹 Start dissection of glue from the bottom edge, where there are no critical plumes.
- 🔹 Keep the tool parallel to the plane of the body so as not to scratch the side frame.
- 🔹 When you meet resistance, stop and warm up this area again with a phenome.
- 🔹 Do not use metal blades near the battery to avoid short circuits.
Design features and location of components
Inside the Xiaomi Redmi Note 9 Pro, the components are quite tight, and after removing the lid, access to the main board and battery is opened. Central place is occupied by a battery closed with a protective film with warnings, and above it is a motherboard closed with a metal screen. It is important to immediately pay attention to the plume connections that can go from the buttons or scanner to the board.
The main camera module protrudes into the body, so when removing the lid, you need to be careful not to engage it with the edge of the glass, and at the bottom of the body there is a charging connector and a speaker, which are closed with a separate plastic lining, and understanding the location of these elements will help to avoid accidental damage during further disassembly.
| Component | Location. | Feature of withdrawal |
|---|---|---|
| Back cover. | Outer hull | Requires heating and careful unhooking |
| Battery | Central part | Fixed on two-way scotch |
| Maternity fee | Upper part | Closed with metal screen and screws |
| Fingerprint scanner | Side-face | Requires caution when bending the plume |
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The main difficulty of disassembling the Redmi Note 9 Pro is the glass back cover, which requires careful heating and careful work with the tool to avoid chipping.
Dismantling the battery and replacing the elements
If your goal was to replace the battery, after removing the back cover, you will see that the battery is tightly glued to the plastic frame. To remove it, you need to use a special glue solvent or isopropyl alcohol, which you need to inject under the edges of the battery with a syringe or pipette. After processing, wait a few minutes for the liquid to dissolve the adhesive compound, and only then try to remove the battery.
Do not try to tamper with a screwdriver or knife, as this can cause it to puncture, fire or chemical reaction. It is best to use special suction cups or plastic blades, carefully loosening the battery from side to side. After removing the old element, carefully clean the seat of glue residue before installing a new one.
⚠️ Warning: If the battery is swelling, you need to work with it extremely carefully, avoiding pressure on the center of swelling, so as not to damage the inner shell and not cause ignition.
Assembly of the device and checking leakage
The Redmi Note 9 Pro build process is reversed, but requires a new layer of glue to ensure the body is tight. Use a special adhesive tape (B-7000 or analogues), applying it in a thin layer along the perimeter of the frame and on the edges of the rear cover. After joining the parts, you need to fix the smartphone with rubber bands for 15-20 minutes for primary polymerization of the adhesive.
Before final assembly, it is recommended to check the operation of all modules: cameras, speakers, microphones and touchscreen. Make sure that all plumes are connected before the click, and the screws are twisted with the right effort to avoid breaking the thread in plastic seats.
- 🔹 Apply the glue in a uniform thin strip, avoiding getting caught on camera or speakers.
- 🔹 Check the vibration before the final fixation of the cover.
- 🔹 Make sure the tray is SIM-cards come in freely and tightly.
- 🔹 Wipe the glass of the back cover with a microfiber before installation to remove dust.