Smartphone Xiaomi Mi 9T deservedly received the status of one of the most popular devices of the brand thanks to the retractable camera and high-quality AMOLED-However, it is the glass surface of the display that is the most vulnerable element of the structure, taking the brunt of the fall. Broken glass or stains on the matrix is not just an aesthetic problem, but also the risk of further damage to internal components by moisture or dust.
Replacing the display on the Xiaomi Mi 9T is a medium-sized task that requires precision and special tools. Unlike many modern models, you do not need to heat the back cover, which makes it much easier to access the insides. However, in order to avoid damaging the plumes and maintain moisture protection of the frames, you need to clearly follow the technology of disassembly and assembly of the device.
Tools and workplace preparation required
Before the start of the screen replacement Xiaomi Mi 9T It's very important to have a clean, well-lit surface, preferably with an antistatic mat or just on a dry table without a pile, and the absence of dust is critical, because the new display can be hit by microparticles that can be seen in bright light. AMOLED-screen.
The job will require a standard set of mobile electronics repair wizards. Without quality tools, there is a high risk of tearing screws or damaging plastic latches of the case. A heat gun or hair dryer is only needed if you plan to reglue the frame, but for a standard module replacement, they may not be necessary.
- 🔧 Set of screwdrivers (required availability) PH00 and Pentalobe, if there are screws at the charging connector, although in 9T mostly crusader).
- 🧸 Plastic mediators or blades for snapping plumes.
- 🌡️ Suction cup for careful lifting of the display.
- 🧴 Isopropyl alcohol and degreasing for cleaning frames.
Make sure all the screws you spin are sorted by disassembly steps.The Xiaomi Mi 9T design uses screws of different lengths, and mounting a long screw into the hole for a short one can cause the motherboard or body to pierce.
Dismantling the old display and disassembling the smartphone
The process of dismantling Xiaomi Mi 9T It starts with the device being turned off. The first step is to remove the tray. SIM-So you can do this without accidentally damaging it or the mechanism when you're working with the body, and then you can unscrew the two lower screws that are on the sides of the connector. USB Type-C.
⚠️ Attention: Do not put excessive effort in removing the display.The screen is glued to the frame, and a sharp jerk can damage the plume connecting the matrix to the board, or cracks in the corner.
Using a suction cup, create a small gap between the screen and the frame at the bottom of the smartphone. Carefully insert a plastic mediator and start leading it along the perimeter, gradually snapping the adhesive layer. Move slowly, warming the edges with a hairdryer at low temperature (about 60-70 degrees) if the adhesive is too hard.
After the screen is separated, don't try to open the smartphone as a book right away. The display plume is still connected to the motherboard. Turn the smartphone over, unscrew the screws of the bottom press plate and gently turn off the display plume and touch screen. Only then you can completely remove the damaged module.
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Before turning off the plumes, be sure to disconnect the battery, which will prevent short circuit and possible failure of the power controller in case of accidental contact of tools with the board.
Design features and transfer of components
New display for Xiaomi Mi 9T It is often provided without a frame (OEM-If you have a frameless module, you need to transfer all the components from the old screen to the new one, which includes a dynamic speaker speaker, proximity and light sensors, and a vibration motor.
Pay special attention to the proximity sensor. In the Mi 9T, it's located under the screen, and if you don't install the new module properly or if you have glue residues in that area, you may have problems with the screen quenching during a conversation.
The mechanism of the retractable camera also requires caution. Although it does not attach directly to the display, if you move it sloppy, you can touch its plume. When moving elements, make sure not to squeeze the plumes during subsequent assembly.
Problem with True Tone (if applicable)
Instructions for installing a new module
Before final assembly, check the new display, connect the plumes to the motherboard without gluing the screen, and launch the smartphone, check the color display, multi-touch operation and sensor sensitivity at all corners.
If the tests are successful, degrease the frame of the new module or cleaned old frame. Apply a new adhesive layer (B-7000 or special glue for screens) with a thin strip along the perimeter. Avoid getting glue into the speakers and button holes.
☑️ Checklist before gluing
Carefully align the module with the frame, starting at the top where the camera mechanism is located. Make sure the plumes are not pinched. Press the screen tightly around the perimeter and lock it with stationery gums or special clips for 15-20 minutes before the initial grasp of the glue.
Then the assembly process goes in reverse: plugging in the plumes, mounting the clamps, twisting the screws. Watch the timing of the screws tightening, they have to sit tight, but without fanaticism, so as not to break the thread in the plastic bushings.
Comparison of original and copie displays
There are many different matrix options in the Xiaomi Mi 9T parts market, and understanding the difference between the two will help avoid disappointment with the image quality after repair, and the main differences are in production technology and color reproduction.
| Characteristics | Original (OEM) | Copy (LCD/Incell) | Copy (OLED Ref) |
|---|---|---|---|
| Type of matrix | Super AMOLED | IPS / LCD | OLED (restored) |
| Brightness | Tall, readable in the sun | Medium, flashing. | Medium/High |
| Finger scanner | It works fast. | Often not working. | It's working. |
| Thickness of the frame | Standard. | Often thicker (black fields) | Standard. |
Original. AMOLED-screens provide deep black and high energy efficiency. LCD-The incills have a thicker layer of glass, which can make the fingerprint scanner under the screen stop working. LCD-Copies often have problems with viewing angle and color reproduction.
Restored OLED-Refs are the original arrays that have the new glass installed on them, and that's a compromise: the image quality is good, the scanner is working, but the life of the screen may be less than the new original.
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To save all the functions of the smartphone, including the fingerprint scanner and the Always-On Display, it is strongly recommended to choose only OLED-matrix (original or high-quality ref).
Common Errors and How to Resolve Them
Even if the instructions are followed, beginners may experience problems after assembly, one of the most common being no image or a white screen, which usually indicates poor contact of the plume in the motherboard connector.
Another common problem is a broken touchscreen in a certain area or phantom presses, which can be caused by contamination of contacts, damage to the plume during installation, or poor quality of the spare module itself.
- 🔌 Bad contact: Disassemble the smartphone again, clean the connectors with alcohol and reconnect the plumes until a characteristic click.
- 🧹 Dust under the screen: If black dots are visible, the screen will have to be peeled off and cleaned again, otherwise the defect will be irritating constantly.
- 🔋 Smartphone won't turn on: Check if the battery is connected. Sometimes after a long idle, the battery needs to be held on charge. 10-15 minute.
⚠️ Note: If after replacing the display, the phone began to discharge quickly or warm up in the area of the camera, the plume or motherboard itself may have been damaged during careless disassembly.
In case of persistent problems with the toll on copies of screens, sometimes calibration through the engineering menu helps, although this does not always work. Enter the code ##6484## to enter the test mode and select Touch.