How to open Xiaomi Mi 9T: professional disassembly of the body

The procedure for opening the case of the Xiaomi Mi 9T smartphone requires high accuracy from the wizard, since the device has a dense layout and glass elements on both sides. Unlike older models, there is no access to the insides through standard screws, which makes the process more time-consuming and requires special tools. If you plan to replace a broken glass, battery or charging plume, you will have to go through the heating of the case, neatly peeling off the cover and dismantling many screws.

Modern smartphones, including the Xiaomi Mi 9T, are assembled using a lot of glue to protect against dust and moisture, and to ensure the design is monolithic. This means that any interference with the device inevitably violates factory sealing. The main task at opening is not to damage the fragile rear panel and not to squeeze the plumes connecting the motherboard with the display and other modules.

In this article, we will take a closer look at each stage of dismantling, with a focus on the lock points and hidden screws that beginners often overlook. You will learn which tools are required and which steps can be skipped depending on your ultimate goal. Remember that inept actions can lead to a complete failure of the gadget, so follow the algorithm carefully.

Workplace preparation and necessary tools

Before you start physically affecting the device, you need to organize your workspace, you need a flat table with good lighting, you need to use an antistatic mat, even a regular dense sheet of paper, and the absence of static is critical to the safety of electronics, because the discharge can instantly kill the power controller.

For a good disassembly, you need a minimum set of tools that can be purchased from any radio parts store: the main tool will be a hair dryer or thermotable for softening the glue. It is not recommended to use household hair dryers for drying hair, since they do not give enough temperature to warm up the perimeter of the case.

• 🛠️ Precision screwdriver kit (cross-hatch) PH00, PH000 flat)
• 🔥 Hair dryer with temperature adjustment or thermostol (optimally) 80-90°C)
• 🧲 Magnetic mat for sorting screws of different sizes
• 🔪 Thin metal spatula or scalpel for cutting glue

Also, be sure to prepare a suction cup and plastic mediators (scapula). Metal tools only use for the initial lifting of the lid, and further snapping is carried out with plastic so as not to scratch the frame and damage the glass.

Primary heating and removal of the back cover

The most critical step is to separate the back glass panel from the metal frame, and the glass is heated unevenly and can burst from a sharp temperature drop, so act methodically. Turn on the hair dryer and evenly warm the perimeter of the device, constantly moving the flow of hot air in a circle.

⚠️ Warning: Don't heat the center of the back cover where the camera and logo are located. Focus on the edges where the adhesive layer is located. Overheating the center can damage the display matrix or battery.

The heating process takes 3 to 5 minutes depending on the power of your equipment. Periodically check the temperature with your hand - the body should become hot, but so that the finger can still tolerate touch (about 80-90 degrees). If the body is cooled and you did not have time to remove the lid, the heating procedure will have to be repeated.

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Use an infrared thermometer to monitor the temperature of the glass. The safe range for removing the lid is 85-90°C, above 95°C, there is already a risk of damaging the oleophobic coating or the structure of the glass itself.

Once the glue has softened, place the suction cup at the bottom of the back cover, closer to the edge. Pull the suction cup up, creating a small gap, and gently insert a plastic blade or thin blade into the slot. Driving the tool along the perimeter, cutting the glue, but don't go deep to avoid hitting the plumes.

Dismantling the protective panel and disconnecting the plumes

Once you successfully remove the back cover, you'll see an interior space that's covered by a black plastic panel, and this panel is also glued and screwed, and you'll need to first twist all the visible screws around the perimeter of this protection.

Note that the screws can be of different lengths, and it's important to remember or write down where each particular screw is twisted, because screwing a long screw into a short hole can cut through the board, and once the screws are removed, you need to tap the mediator and remove it.

Underneath the safety panel is the battery and the plumes that go to the motherboard, and the first thing you need to do is turn off the power, find the battery connector, and gently snap it off with a plastic blade, and then you can touch the other connectors.

Then you have to disconnect the main plume of the display and the plume from the lower board (charging), which can be closed with a metal protective plate, which also needs to be unscrewed. Act without sudden movements, as the Xiaomi Mi 9T connectors are quite fragile.

Removal of the battery

The battery in Xiaomi Mi 9T is fixed to double-sided tape, which eventually loses its properties, but at the first opening holds very tight. In any case, do not try to impinge the battery with metal objects - a puncture of the lithium polymer element will cause instant ignition.

Use plastic cards or a thin line to extract safely, and if you use a fishing line, use it under the battery on the bottom (near the plume) and use left-right slashing with the adhesive layer, which is the safest and most effective method.

In some cases, the adhesive layer can be very stiff, allowing easy heating of the back of the device (if the battery is still inside) or the careful insertion of isopropyl alcohol under the edge of the battery with a syringe, which dissolves the glue, making it easier to dismantle.

• 🔋 Do not bend the battery – this will lead to an internal circuit
• 🔋 Do not use sharp metal objects for tatting.
• 🔋 When installing a new battery, be sure to use a new glue or scotch

Access to the bottom plume and charging connector

A common cause of disassembly is to replace the bottom charging plume, especially if the phone has stopped seeing the charger or is not communicating well. Accessing this node will require removing almost all the internal components, since the connector is located at the bottom of the case.

After removing the battery and the main protective panel, you will need to unscrew the motherboard, which is held on several screws and connected by antenna contacts, carefully click the pins of the antennas (usually they are golden in color and located on the edges of the board).

Then unplug all the remaining plumes: the main display plume, the side button plume, the vibrator plume, and only after you're fully free can you retrieve the motherboard, and underneath that, you'll see the bottom board with a USB-C connector.

Replace the bottom plume by unscrewing the two screws holding the board and turning off the connector. When assembled, make sure the microphone holes match the cutouts in the case, otherwise the interlocutor will hear you very quietly.

Replacement of the display and screen module

If your goal was to replace a broken display, the process is even more complicated. The screen in the Xiaomi Mi 9T is glued to a frame, and often sold as a frame, which makes it much easier: you don't have to separate the glass from the frame, risking damage to the new matrix.

If you only bought a frameless touchscreen matrix, you'd have to move all the insides from the old frame to the new one, a time-consuming process that requires the complete dismantling of all the nodes described above, and the old frame needs to be thoroughly cleaned of the glue and glass residue.

When installing the new module, be sure to check the touchscreen and images before final assembly and sealing. Connect the plumes, turn on the phone and check the response in all areas of the screen, which will save you time to re-disassemble in the event of a marriage.

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Buying a display assembled with a frame (OEM or original) is always preferable, since the factory tightness of the frame and the quality of the glue there is better than with self-adhesive pasting.

Assembly of the device and checking leakage

The assembly is done in reverse order, before you install the back cover, you need to completely remove the old glue from the frame, use alcohol and a plastic blade to do this, and the surface must be perfectly clean and fat-free, otherwise the new cover will lie unevenly or unstuck.

Apply the new glue (B-7000 or special electronics glue) with a thin layer around the perimeter. Let it dry a little (1-2 minutes) to a state of stickiness, then gently apply the lid and press evenly around the edges. You can use stationery gums to lock the lid during drying (about 1-2 hours).

Once assembled, turn on the device and check all the functions: the operation of the volume and on buttons, vibration, sound in the speaker and through the headphones, the work of cameras and sensors. Pay special attention to the proximity sensor, which in this model is hidden under the display.

⚠️ Attention: Complete polymerization of the glue takes up to 24 hours. On the first day, try not to put the phone under load, do not put it in your pocket and avoid moisture, as the factory seal is already broken.

Self-disassembly Xiaomi Mi 9T is a complex but doable process with straight hands and the right tool. the main thing is to take your time, monitor the length of the screws and the heating temperature. Carefulness at each stage ensures successful repair and prolong the life of your device.

Frequently Asked Questions (FAQ)