Disassembling a modern smartphone is always a balance between the desire to save on repairs and the risk of damaging fragile components. Xiaomi Redmi Note 9 Pro is no exception: the device has a glass back panel and a complex internal layout, which requires the wizard to be more accurate and the right tool. Before starting to dismantle, you need to clearly understand the structure of the device and the sequence of actions to avoid fatal errors.
In this article, we will cover the detailed process of opening the case, replacing the battery, display module and other key nodes. Prepare a workplace with good lighting and be patient, as the process can take from 30 to 60 minutes.
The challenge is that the Redmi Note 9 Pro is built on adhesives, not screws, which is typical of many modern devices, which means that without high-quality heating and special suction cups, it is almost impossible to accurately open the device, and then we will analyze each step to minimize the likelihood of damage to the plumes and the body.
Tools and workplace preparation required
Xiaomi’s high-quality disassembly is impossible without a specialized set of tools. Using improvised tools like knives or needles often results in scratches on the frame, damage to plumes or, in the worst case, a battery puncture. You’ll need a heating element to soften the glue, a set of precision screwdrivers and plastic mediators to snap the case.
Special attention should be paid to the organization of the workspace. All screws are better folded on a magnetic mat or in a container with cells, signing each stage of unscrewing, since the fasteners can differ in length and type of thread. Losing even one small screw can lead to rattling of the case or leakage.
- 🔥 Dryer or heat pad to heat the back cover (temperature near the back cover) 80-90°C).
- 🔧 Sets of screwdrivers (cross Phillips #00, #0 and flat).
- 🛠️ Plastic blades, mediators and suction cup for opening the body.
⚠️ Warning: Before starting work, be sure to turn off the battery if possible at an early stage, or act extremely carefully so as not to cause a short circuit in case of accidental contact of the plume with the board.
Preparation of the smartphone for disassembly and security measures
The first step is to remove the tray. SIM-This is a critical point, because trying to heat the device or to lid the tray is guaranteed to deform it or break the locking mechanism. Use the clip or key included in the delivery to carefully extract.
Then you need to turn off the smartphone completely. Do not leave the device in sleep mode, as accidental switching on of the screen or vibration during operation can damage the display or cause a short circuit.
Heat the perimeter of the back cover. Warm up the edges of the device with a hairdryer evenly for 2-3 minutes, constantly moving the air flow so as not to overheat certain parts of the matrix or battery. The temperature should not exceed 90-100 degrees Celsius, otherwise there is a risk of damage to the adhesive base of the display or melting the internal components.
☑️ Preparation for disassembly
Removal of the rear glass panel
Once the glue has softened, you need to create an initial gap, attach the suction cup to the bottom of the back cover, closer to the edge, and gently pull up, while inserting a thin plastic mediator into the resulting gap, and act slowly, without sudden jerks, so that the glass does not crack under load.
Drive a mediator or thin metal plate (with tape tape for protection) along the perimeter of the case. Exercise special care in the corners and in the area of the chamber where the glue can be applied more tightly. If the resistance is too high, stop pulling and warm up the problem area again with a hairdryer.
Remove the cover by moving the book from the bottom up, since the main plumes (print scanner, antenna connectors) are usually located in the upper or central part, a sharp separation can lead to the break of thin plumes, the restoration of which will require soldering or replacement of components.
💡
Use isopropyl alcohol or a special liquid to dissolve the glue if the suction cup is not held on the broken glass.Drop some liquid into the crack and wait a couple of minutes.
Dismantling the protective plate and disconnecting the plumes
When you remove the back cover, you'll see an internal arrangement that's covered by a black plastic or metal plate, and this plate is fixed by a lot of screws of different calibers, and you'll unscrew all the screws you can see using a suitable screwdriver to keep your hats from breaking.
Under the plate are the connectors of the display, the battery and the main cameras, and the first thing you need to do is turn off the battery plume to turn off the device, and then you can disconnect the other plumes, gently lifting them with a plastic blade or a nail, but by no means a metal tool.
When you remove the plate, you have full access to the motherboard and the lower module. Pay attention to the location of the antenna contacts and wireless modules, they are easily damaged by careless movement. All the screws and small parts removed are better sorted immediately.
| Component | Location. | Type of attachment | Risk of damage |
|---|---|---|---|
| Battery | Central part | Glue strip + connector | High (puncture) |
| Display plume | Top of the pay | Clamp connector | Middle (cliff) |
| Main camera. | Upper left corner | Planting space + screw | Low. |
| Imprint scanner. | On the back cover. | Plate + glue | High (blow) |
Replacement of the battery and lower module
To replace the battery, the Redmi Note 9 Pro must remove the black adhesive strips that hold the battery, often containing exhaust tongues that can be pulled over, and if they are missing or have broken, use a thin line or plastic card dipped in alcohol to carefully separate the battery from the case.
⚠️ Warning: Never try to hit the battery with a screwdriver or knife! puncture of a lithium polymer battery causes instant fire or explosion.
The bottom module contains a USB Type-C charging connector and a main speaker, which is mounted with multiple screws and connected by a plume to the motherboard, and when replacing this node, it is important not to confuse screws of different lengths, since too long a screw can break through the paths on the board.
Installation of the new battery is made only after a thorough cleaning of the landing place from the residue of old glue. New adhesive strips will ensure reliable fixation and prevent the battery from bloating due to poor heat sink. After installing a new battery, connect the plume and check the reaction of the device before final assembly.
💡
Replacing the battery requires gently removing the old glue without damaging the body, as new strips must lie on a flat surface.
Removal of the display module and frame
In some Xiaomi models, the screen changes with the frame, which makes the process much easier. However, if you change only the glass or the matrix, the process becomes more complicated. The screen in the Redmi Note 9 Pro also holds on to the glue and requires heating to dismantle.
Use a suction cup and heat to separate the display from the frame. Move around the perimeter, gradually increasing the gap. The display plume passes through special channels, and it is easy to damage if you pull the module too hard or at the wrong angle.
When installing the new module, make sure the frame is clean and defatted. Apply a new layer of B-7000 glue or use a pre-cut adhesive for secure fixation. Press the screen evenly around the perimeter and lock with rubber harnesses for 15-20 minutes to polymerize the adhesive.
Assembly of the device and verification of functionality
The assembly is done in reverse order. First, install and connect all the internal components, check the touchscreen and images without sticking the back cover. Make sure all the plumes are snapped to the characteristic click, and the screws are twisted tightly, but without a drag.
Apply a new glue to the body or use a finished adhesive frame for the back cover. Carefully align the lid with the body and press evenly around the perimeter. Extended glue, removed with a soft cloth soaked in alcohol, until completely dry.
Once assembled, turn the device on and perform a comprehensive test: a test of the camera, speakers, microphone, vibration and fingerprint sensor. If all functions are working correctly, the repair can be considered successful.