Modern Xiaomi smartphones have become an integral part of our lives, but even the most reliable devices sometimes require external intervention.The question of how to open the Xiaomi Redmi Note 9 often arises for users faced with a broken screen, a worn-out battery or a desire to clean the device from dust. Self-repair can save significant funds, but requires extreme care and adherence to technology.
The process of dismantling this smartphone is not trivial, as the manufacturer uses adhesives to fix the back cover, this is done for aesthetics and moisture protection, but it makes it much more difficult to access the internal components. Breaching the leaks when sloppy opening can lead to loss of moisture protection, so it is important to act methodically and use the right tools.
In this article, we will take a look at all the steps in preparation and execution, learn about the nuances of lid unplugging, the order of disconnecting plumes and precautions when working with lithium polymer batteries. Even if you are new to electronics repair, following the instructions carefully will help to avoid fatal errors.
Tools and workplace preparation required
Before you start disassembling the Redmi Note 9, you need to organize a comfortable and safe space. You will need a flat table with good lighting, preferably without fuzzy coatings, so that small screws do not get lost. The lack of static electricity is a critical factor, so it is recommended to use an antistatic bracelet or at least regularly touch grounded metal objects.
To do a good job of disassembling, you need a specialized set of tools, and the use of improvised tools such as kitchen knives or needles is highly undesirable, as they can damage the body or, worse, damage the internal components.
- 🔥 Hair dryer (building or household temperature-adjusted) for softening glue.
- 🔥 Suction and mediators (plastic blades) for neat opening of the body.
- 🔥 Set of screwdrivers (cross-crosses) PH00, PH000 Torx T5) screw-twisting.
- 🔥 Tweezers with curved ends for working with plumes and small details.
⚠️ Warning: Before starting any work, be sure to turn off your smartphone and remove the tray SIM-Attempting to disassemble the switched-on device may short-circuit and cause the motherboard to fail.
It's also worth preparing a screw sorting tank, as they can vary in length and diameter. If you mix them up when you build them, you can damage the thread in the plastic racks or even punch through the body. The glue under the back cover of the Redmi Note 9 is quite durable, so stock up with quality B-7000 or T-7000 glue for reverse assembly.
Removal of the back cover and primary access
The most difficult and risky step is to separate the glass back from the metal frame. - Redmi Note 9 You use double-sided perimeter tape, which requires thermal exposure. Turn on the hair dryer and evenly warm the perimeter of the back cover during the heat. 2-3 minutes, holding the instrument at a distance 3-5 Do not overheat one point so as not to damage OLED-battery.
After heating, gently attach the suction cup at the bottom of the lid, stepping away from the edge about 1-2 cm. Slightly pull up, creating a gap, and immediately insert a thin plastic mediator into the resulting gap. Move the mediator along the edges, gradually cutting through the adhesive layer. It is important not to enter the tool too deeply, so as not to touch the plumes or the battery itself.
Pay special attention to the areas around the camera module and the fingerprint scanner. The glue can be applied more abundantly and additional warming is required. If the lid is removed with difficulty, do not use force - better warm up the edges again. A sharp movement can lead to glass chips or deformation of the frame.
☑️ Preparation for lid removal
Disabling plumes and dismantling protective screens
When you successfully remove the back cover, you will see the inside of your smartphone, and immediately notice the plume coming from the fingerprint scanner, which is often attached to the inside of the lid, which you need to turn off first so you don't damage it if you do any further manipulation, and then you need to gently tuck the connector in with a plastic blade or nail.
Next, you take out the plastic safety panel that covers the bulk of the components, and it's fixed by a lot of screws of different calibers, use a magnetic mat or circuitry to remember the location of each screw, and some screws can be hidden under stickers or plugs, so look carefully at the surface of the board.
The main task at this point is to access the battery connector, until you turn off the power, it's dangerous to work with other components, find the battery connector and gently snap it off, and then you can safely disconnect the plumes of the display, the cameras and other modules.
| Component | Type of attachment | Risks in dismantling |
|---|---|---|
| Back cover. | The glue layer | Breaking glass, deformation of the frame |
| Protective panel. | Screws (different) | Thread damage, screw loss |
| Battery plume | Connector latch | Contact break, short circuit |
| Display plume | Connector latch | Damage to tracks, image artifacts |
⚠️ Warning: Metal shielding screens can be glued to the board. Don't tear them away by force, it's better to warm up slightly with a hair dryer to soften the adhesive base.
Replacement of the battery and work with the glue layer
In the Xiaomi Redmi Note 9, the battery takes up a significant portion of the internal volume and is fixed with powerful adhesive strips. Trying to remove the battery without preheating is almost guaranteed to cause it to deform or damage. Heat the bottom of the smartphone (where the battery is) with a hairdryer to a temperature of about 60-70 degrees. You can check the temperature with the back of the palm - it should be hot, but tolerant.
Use a special hood with a suction cup or a thin plastic card soaked in isopropyl alcohol. Enter the card under the battery and make sawing movements, gradually separating the cell from the body. Under no circumstances use metal tools that can puncture the battery shell. Damage to the lithium cell can cause ignition or explosion.
After removing the old battery, carefully clean the seat of glue residue. For the new battery, use a special double-sided tape or adhesive stripes that come with the kit. Press the new battery tightly and let the glue grab for a few minutes before connecting the plume.
What to do if the battery is swelling?
Nuances of replacement display and touch screen
If your goal was to replace a broken display, the process of removing the module in the Redmi Note 9 is from the frame after removing all the internal components. The screen here is glued around the perimeter, and its removal requires care. Pre-remove the remnants of old glue from the frame, using alcohol and soft fabric, so that the new module lay perfectly smooth.
When you install a new display, first plug in the test plume without sticking the module permanently. Turn on the phone and check the touchscreen, the matrix for broken pixels and the proximity sensors. Once you're sure of serviceability, apply the new layer of glue B-7000 with a thin strip along the perimeter of the frame.
Set the module and press it tightly around the edges. You can use rubber screeds or weights to fix it better. 15-20 minutes until the glue is polymerized, and the excess glue that has protruded outside, carefully remove with a dry wipe or cotton swab soaked in alcohol.
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Check the proximity sensor before final assembly. Often, after changing the screen, the sensor may not work properly due to protective film or contamination.
Assembly of the device and verification of functionality
The final stage is reverse assembly, which requires attention to detail.Make sure all plumes are snapped to a characteristic click and the screws are swirled with the same force.Don't tug the screws, especially those that attach the board, as this can lead to microcracks in the textolite.
After installing all the internal components and connecting the battery, do not rush to immediately glue the back cover. Turn on the phone and perform an initial diagnosis. Check the operation of cameras, microphones, speakers, vibrator and communication modules (Wi-Fi, Bluetooth, 4G).
If all systems are working properly, apply a new layer of glue to the frame of the case and install the back cover. Press it evenly around the perimeter. Leave the smartphone alone for a few hours to gain maximum strength, only then you can remove the protective films and start active use.
⚠️ Warning: If after assembly, the smartphone does not turn on or discharges quickly, you may have latched the battery connector poorly or damaged the plume during assembly.
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High-quality cleaning of the frames from old glue is the guarantee that the back cover and display will be held securely and will not peel off after a month.