Modern smartphones are becoming more difficult to maintain, and the Xiaomi Redmi Note 9 Pro is no exception to this rule. Many owners face the need to open the case to replace broken glass, worn-out battery or restore the charging connector. However, without proper preparation and understanding of the internal architecture of the device, you can easily damage fragile plumes or break the tightness.
In this article, we will take a closer look at the dismantling process, paying special attention to hidden screws and the features of attachment of components. The right sequence of actions will help you avoid the typical errors that often lead to a breakdown of the matrix or damage to the main camera plume. Be careful, as each step requires accuracy and appropriate tool.
Tools and workplace preparation required
Before any electronic manipulations begin, you need to have a safe space, you need a clean table with good lighting, where you don't get any foreign objects that can scratch the case, and it's also important to have a special tool, because ordinary household screwdrivers can lick the screws.
For a quality disassembly of the Redmi Note 9 Pro, you will need a set of precision screwdrivers, including a cross Phillips #00 and a flat latch for snapping.
- 🔧 A set of screwdrivers with a magnetic tip for working with small screws.
- 🔥 Dryer or heat pad to soften the glue under the back panel.
- 🧤 Dielectric gloves and tweezers for working with small components.
- 📦 Containers for sorting screws, so as not to confuse them when assembling.
⚠️ Warning: Never start disassembling if the battery is over 25%, as the risk of short circuits in case of accidental battery damage increases significantly.
Pay special attention to the condition of the battery before work. If the battery is swelling, heating it can lead to fire, so you need to act with utmost care. Ideally, before disassembly, you should discharge the device to a minimum, if possible without the risk of sudden shutdown in the process.
Removal of the rear glass panel
The first and most important step is to dismantle the back cover, which in the Redmi Note 9 Pro model is made of glass and planted on double-sided tape. Heating the device is a mandatory procedure to soften the adhesive layer and avoid chipping when bending. Use a hair dryer at medium temperature, evenly warming the perimeter of the case for 2-3 minutes, avoiding direct impact on the center part where the camera is located.
Once warmed up, place a suction cup at the bottom of the back cover and pull up slightly, creating a small gap. Insert a plastic mediator into the resulting gap and guide it along the perimeter, cutting the adhesive layer. Don't rush or exert excessive effort to prevent the glass from cracking.
What to do if the lid does not move?
After the glue around the perimeter weakens, slightly raise the panel and check if the wires are stretched.
Dismantling the protective plate and disconnecting the plumes
Under the back cover, there's a plastic or metal plate covering the main nodes of the smartphone, and it's mounted with a lot of screws of different sizes, and it's critical that you don't confuse them, and some screws can be hidden under stickers or rubber plugs that you need to carefully remove before you unscrew.
Once all screws are removed and the protective cover is removed, the motherboard is accessed, and the first step is to turn off the battery plume to completely power the device down and eliminate the risk of short circuit, and then you can disconnect the plumes of the display, cameras and other modules.
☑️ Procedure for disconnecting plumes
Use a plastic blade or nail to turn off the connectors, putting them upright. Metal tweezers are not allowed here, as you can damage the contacts on the board or break through the insulation. Note antenna cables, which are often attached with latches and require careful snapping.
| Component | Type of attachment | Risks of withdrawal | Tool. |
|---|---|---|---|
| Battery | plume connector | Short circuit. | Plastic spatula |
| Display. | Wide plume | Breaking the tracks | Tweezers with insulation |
| Main camera. | Lock-in plume | Lens damage. | Plastic mediator |
| Antennae | Round connectors | Deformation of the connector | Tweezers |
Removal of the battery and replacement of elements
In the Xiaomi Redmi Note 9 Pro, the battery takes up a significant portion of the internal volume and is attached to a powerful adhesive layer. Removing it often requires reheating the lower body to soften the adhesive. Do not attempt to tamper with metal objects under any circumstances, as a puncture of the shell will cause instant ignition.
The best solution is to use special pull-out bands that are built under the battery when it's built in the factory, and if you don't have these tapes, you can use the plastic card carefully, warming the surface with a hairdryer, and the movements should be smooth, without jerking, so that the battery itself doesn't deform.
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Use isopropyl alcohol to dissolve the glue under the battery – this will greatly simplify its extraction and reduce the risk of damage to the case.
When installing a new battery, make sure the connector contacts match the return part on the board. Before final fixing, check the voltage on the terminals if you have a multimeter to rule out the defect of a new part. Battery replacement is one of the most sought-after repairs that extend the life of the smartphone.
Replacement of the display and touch screen
The screen in the Redmi Note 9 Pro is a modular design where the sensor array and glass are glued together. To replace, you need to completely dismantle the frame or carefully separate the old module, which is almost impossible to do without damage at home, so most often replace the module assembled with the frame.
The process requires re-painting all internal components from the old frame to the new one, including the control board, speaker and vibrator, and must be worked with extreme care, as new screens often come without a protective film on the back and are vulnerable to statics.
- 📱 Carefully warm up the perimeter of the old screen to facilitate removal.
- 🧼 Degrease the seat of the new frame before installing the module.
- 🔌 Check the touchscreen before final assembly and gluing.
⚠️ Note: When installing a new display, do not press on the central part of the matrix so as not to squeeze out the liquid and create spots.
Once the new display plume is plugged in, you need to check the image and the response to the touchscreen. If the touchscreen is not working properly or there are artifacts, you should double-check the connector's landing density. Sometimes you need to turn off and connect the plume several times to remove the oxides.
Assembly of the device and verification of functionality
The reverse order is used, but there are some nuances about fixing the screws, so don't twist the screws of the protective plate to the end at once, make money first, and then evenly tighten them diagonally, so you can avoid skewing the board and the appearance of foreign creaks.
Before installing the back cover, be sure to conduct a primary test of all features: camera, speakers, microphone and communication modules. Make sure all plumes are snapped to a characteristic click, and the antenna cables are connected correctly, otherwise there may be problems with the signal level.
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Quality assembly depends not only on the correctness of actions, but also on the cleanliness of the internal surfaces - remove all dust before closing the case.
To fix the back cover, use a special glue B-7000 or T-7000, applying a thin layer around the perimeter. After connecting the parts of the device, it is recommended to lock the smartphone with rubber bands for 15-20 minutes for primary polymerization of the glue.