Xiaomi Redmi 9T has proven to be a reliable device with excellent autonomy, but mechanical damage to the screen remains one of the most common reasons for using services. Broken glass or leaky matrix module not only worsen visual perception, but can also lead to finger injuries with fragments. Self-replacement of the display module is a complex but feasible process that requires accuracy and understanding of the design of the gadget.
Owners often face a dilemma: carry the device to the workshop or try to restore it on their own. If you have experience with small electronics and the necessary tool, you can save a significant amount. However, it is worthwhile to understand that the display module in this model is glued to the frame, which makes it difficult to process compared to phones, where the screen is simply inserted into the slots.
Before you start, it is critical to prepare the workplace, you will need a clean, well-lit surface that will not be accessible to pets and children, any speck of dust that gets under the glass during the assembly process will be a noticeable defect that will be annoying in the future, and also make sure that you have all the necessary tools at hand, as interrupting the process can lead to damage to the plumes.
Tools and workplace preparation required
The quality of the result depends on the equipment used. To disassemble the Redmi 9T standard set of screwdrivers will not be enough, since the body is assembled on an adhesive. You will need a special heating element to soften the adhesive that holds the back cover. Without heating, there is a risk of splitting the glass of the rear panel when you try to open it.
Also, fine plumes and small screws require precision tools, tweezers must be curved and antistatic so as not to damage the delicate components of the board. Special attention should be paid to suction cups and mediators: they must be thin enough to penetrate the microscopic gap, but strong enough not to break inside the case.
- 🔧 Set of screwdrivers (cross-crosses) PH000, PH00 flat)
- 🔥 Hair dryer or heat pad for heating the body
- 🧲 Magnetic screw-sorting mat
- 🧴 Clay. B-7000 or T-7000 fixation
- 🧤 Antistatic gloves and shoulder blades for opening
⚠️ Attention: Using a regular household hair dryer often doesn't give enough temperature to soften Xiaomi's factory glue.It's better to use a temperature-adjusted building hair dryer or a special heating pad, heating the edges to 80-90 degree.
Organizing space is key to success. Put the tools in order of use. Prepare the tanks for small parts in advance, because the screws in the Xiaomi Redmi 9T can differ in length and diameter of the thread. If you confuse them, you risk breaking through the body or damaging the internal filling when you screw a longer screw into a short hole.
☑️ Preparation for repairs
Removal of the back cover and removal of protective elements
Redmi's disassembly process 9T start off SIM-This is a mandatory step, and ignoring it can damage the tray or motherboard mechanism when you try to remove the back panel. After removing the tray, you need to warm up the perimeter of the back cover. 2-3 minutes, constantly moving the heat source so as not to overheat one point and not damage the battery or OLED-back-screen.
Once the glue has softened, insert a thin suction cup into the bottom of the back cover, next to the charging connector, and gently pull, creating a small gap. Insert a plastic mediator or a thin blade into this gap. Move the tool along the perimeter, cutting the adhesive layer. Don't immerse the tool too deeply, so as not to touch the plume of the fingerprint scanner, which is located on the back cover in some modifications or connected to the board.
Once you remove the lid, you'll see a plastic frame covering the bulk of the insides, and it's attached to a lot of screws of different sizes, and you have to twist them out in order to be tidy, and you can use a magnetic mat with a marking, or you can just put the screws in rows on paper, and you can mark where each one came from, and you can get the battery and the plumes off.
Features of the fingerprint scanner
Then you have to turn off the battery. This is a critical safety step, and before you touch any other plumes or components, you have to remove the battery connector from the motherboard, and this will turn off the device and prevent short circuits from accidentally damaging other circuits as you disassemble them further.
Removal of the old display module
Once the device is de-energized, you can start working with the screen. In Xiaomi Redmi 9T, the display module is glued to a plastic medium frame. To remove it, you will need to apply heating again, but on the front side. Be extremely careful: if the glass is already broken, heating can lead to shrapnel of fragments inside the case, in which case it is recommended to pre-seal the front part with a wide transparent film or tape.
Heat the edges of the screen to about 80 degrees. Carefully tuck the module into a thin suction cup and a spatula. Your task is to separate the module from the frame without damaging the plumes that may pass underneath, or the frame itself. In this model, the plumes of the display and touchscreen are sideways and connected to the board, so you first need to disconnect the connectors from the motherboard, first unscrewing the metal protection if it closes the connectors.
- 📱 Turn off the main display plume
- 📱 Disconnect the touchscreen plume (if the module is separate, in Redmi). 9T prefabricated)
- 📱 Remove the dynamic conversational speaker if it is fixed to the module
- 📱 Transfer the camera and proximity sensors to the new module
When you remove the old module, pay attention to the condition of the sealing gum. If it is preserved, it can be carefully cleaned and reused, but it is better to replace it with a new one to preserve moisture protection. Also check the condition of the speaker mesh, often it is clogged with dust, which worsens the sound of the interlocutor.
⚠️ Attention: Never pull the plumes! You can only remove the connectors from the connectors by swaying them from side to side with special plastic tools or nails.
If you change only the glass, and not the entire module, the process becomes much more complicated and requires a separator and laminator, which is almost impossible to do at home. Therefore, for the Redmi 9T, it is recommended to replace the module with a frame or without, but completely (matrix + glass + touchscreen).
Installation of a new screen and assembly of the device
Before installing the new module, you need to transfer all the hinged elements from the old screen, which include: speaker, button plumes (if they are not on the board), light sensor and camera. Make sure that the new module is only removed from the contact areas, and the work surface is protected for now. Apply a thin layer of glue B-7000 or T-7000 on the frame of the new module.
Carefully put the module in place, combining all the holes and edges. Don't press hard until the glue is completely dry, just fix it slightly. Connect the display and touchscreen plumes to the motherboard. Make sure the connectors are standing before the click and evenly. After that, you can temporarily (without screws twisting) install the frame and connect the battery for initial inspection.
| Verification phase | Action. | Expected output |
|---|---|---|
| Inclusion | Pressing the power button | Vibration, Mi/Redmi logo |
| Image: | Booting the system | Lack of stripes, broken pixels |
| touchscreen | Dragging icons | Smooth response, no "dead zones" |
| Sensors. | Call, autobrightness | The screen will be turned off when it is brought to the ear. |
If all tests are successful, you can proceed to the final assembly. Apply a new layer of glue around the perimeter of the case to fix the back cover. Set the lid, making sure that all the plumes (especially the fingerprint scanner) are not clamped. Lock the device with rubber bands or a load for 1-2 hours before the polymerization of the glue.
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Use an ultraviolet lamp (UV) to dry the glue if you have a special glue for UV curing.This will reduce the fixation time from 2 hours to 5-10 minutes, but requires caution not to overheat the plastic.
Typical errors and troubleshooting
One of the most common problems after replacement is a broken touchscreen or dead zones. Often this is due to poor plume contact. In the Redmi 9T, the connectors are quite tight, and it may seem like the plume is inserted, although this is not the case. Try reconnecting the connector by clearing the contacts with alcohol.
Another problem is yellow spots or uneven backlighting, which may indicate that the module was heavily pressed during assembly or damaged during transportation, and it is also possible that you forgot to remove the transport film on the inside of the new screen before installation, which creates an airbag and distorts colors.
- ❌ Screen not turned on: check the connection of the battery and the main plume of the display.
- ❌ Touchscreen "gluts": check whether the plume of the touchscreen is transmitted by screws of the frame.
- ❌ No sound: make sure the plume of the lower speaker is connected and the speaker itself is serviceable.
- ❌ Interferes with image: remove the protective film from the inside of the matrix.
⚠️ Attention: If the fingerprint scanner stopped working after the screen was replaced, the plume running from the on button to the board is most likely damaged. 9T This plume is very thin and easily breaks with careless disassembly of the frame.
Sometimes users are faced with the fact that the automatic brightness is not working, this is a problem of calibrating the light sensor, in some cases, helps resetting the settings or rechecking the connection of the corresponding plume, which often comes as part of the main charging plume or a separate wire.
Calibration and final tests
After the glue is fully assembled and dryed, the final calibration is recommended. For the Xiaomi Redmi 9T, there is an engineering menu available through the code ##6484##. In this menu, you can test all the components of the device: vibration, screen colors, multi-touch, sensors and sound.
Go through all the tests, especially the Touchpanel, draw lines in all corners of the screen to make sure there are no blind spots. If a line breaks in any corner, then the assembly is not perfect, or the module is defective. Also check the proximity sensor — close the top of the screen with your hand, the indicator must respond.
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Successful screen replacements are not only about keeping the image working, but also keeping all sensors and scanners functional. Don't ignore testing the engineering menu before you finally seal the case.
If you pass all the tests, congratulations! You have saved money and gained valuable experience in repairing mobile equipment. A properly installed quality module will last as long as the original, especially if you used good supplies and carefully handled the device in the process.