Modern smartphones are becoming increasingly difficult to maintain, and the Xiaomi Redmi 9T is no exception. Despite the affordable price, the device has a monolithic design that requires accuracy and precise movements when opening the case. Self-repair is often necessary when the warranty period has expired and replacing the screen or battery in the service is unnecessarily expensive. Understanding the internal architecture of the gadget is the first step to successfully restore its health.
Before you start dismantling, you need to be aware of the risks. Mishandling plumes or using the wrong tools can lead to permanent damage to the motherboard. In this article, we will take a detailed look at the disassembly process, highlight key nodes, and point out the subtleties that the official manuals keep silent about. Your goal is not just to open the case, but to do it safely for electronics.
It's important to note that it's also known as the Redmi Note 9T or Poco M3 depending on the region, but they're very similar in design. It takes longer to prepare the workplace than the screws themselves. The critical thing is to turn off the battery before touching any other connectors on the board. It's the golden rule of mobile repair, ignoring which can be short-circuited.
Tools and workplace preparation required
For high-quality disassembly Xiaomi Redmi 9T you will need a specialized set of tools that can be found in radio parts stores or ordered online. Use of household scissors or kitchen knives is unacceptable, as they can damage fragile components or scratch the body. The basis of your arsenal will be a set of precision screwdrivers, including cross bits PH00 and PH000.
In addition to screwdrivers, there is a must-have suction cup and mediators (plastic blades) to carefully peel off the back cover. The glue that holds the glass is often very strong, and a sharp jerking motion can lead to cracks, and tweezers with curved ends are also useful for extracting small screws from deep wells.
- 🔧 A set of precision screwdrivers (cross and flat)
- 🧲 Magnetic screw-sorting mat
- 🌡️ Hair dryer or heating pad for heating the adhesive layer
- 💊 Isopropyl alcohol for dissolving glue
Space organization is just as important as tools. The screws in modern smartphones can be as long as they are on a single plate, if you mix them up with places when you build them, you can break the tracks on the board or damage the thread, and it's recommended that you immediately prepare the space for the screws of different groups.
☑️ Preparation for disassembly
Primary dismantling: Removal of the back cover
The process of opening the Redmi 9T begins with heating the perimeter of the case. The factory adhesive is polymerized at about 80-90 degrees Celsius. Use a hair dryer, evenly warming the edges of the device for 2-3 minutes. Do not hold the jet of hot air for long in one place so as not to overheat the matrix or battery.
After heating, insert a suction cup at the bottom of the back panel and pull up slightly to create a gap. Insert a plastic mediator into the resulting gap carefully. The movements should be sliding, along the edges, not stabbing inwards. You will feel the resistance of the glue — this is normal, continue warming up and carefully separation.
⚠️ Warning: Do not use metal blades to separate the lid.The metal can damage the fingerprint scanner plume, which is often glued to the inside of the glass, or interrupt antenna lines.
When the perimeter is free, don't be in a hurry to remove the lid completely. In some versions, it can be attached to the plume of the sensor or antenna. Carefully inspect the internal connections before the final compartment. If the lid is sitting dead, add a little more isopropyl alcohol around the perimeter and wait a couple of minutes.
When you take the lid off, you'll see a plastic plate that covers the bulk of the components, and it's attached to a lot of screws around the perimeter and in the center, and you'll unscrew them in sequence, starting with the outside, moving towards the center, and that will help you avoid skewing the pressure on the body.
Removal of protective plates and access to the battery
Under the plastic cover, the motherboard and the top of the battery pack are hidden. In the Redmi 9T, the design involves the added protection of metal shielding on the board itself, but our goal is to get to the power connector.
Carefully disconnect the plume from the bottom board to the main board, which can be protected by an additional downstop bar, unscrew the screws of the mounting of the bar using tweezers to extract, and put them aside, only after that you can turn off the plumes.
| Component | Type of attachment | Risks of withdrawal |
|---|---|---|
| Back cover. | Glue + screws | Breaking glass, breaking plume |
| Protective plate. | Screws (different lengths) | Damage to plumes under the plate |
| Battery | Double-sided scotch | Battery puncture, fire. |
| plumes | Latches (ZIF) | Contact break, lock breakage |
Xiaomi's battery is usually mounted on a powerful two-way tape. You can't pull the top edge to extract it safely. You need to use a special hood or a plastic card soaked in alcohol and gently saw the adhesive layer under the battery.
What to do if the battery is blown?
Dismantling of the display module
Screen replacement is the most common cause of disassembly. - Redmi 9T used IPS-If you change only glass (which is almost impossible without a laminator at home) or a module assembled, the procedure is similar.
First, you need to unscrew all the screws that hold the display frame, which can be as many as 10-12 pieces. Notice the screws at the bottom, near the charging connector, they are often hidden under decorative plugs or rubber pads.
Once the fasteners are released, the module needs to be heated, the glue under the screen also requires temperature exposure, use a tension suction cup and a mediator to separate, move slowly, trying not to damage the side frames if you plan to use them again.
- 🔥 Evenly warm the screen around the perimeter
- 🖐️ Create a suction tension
- 🛠️ Enter the mediator and lead around the perimeter.
- 🔌 Turn off the plume immediately after removal
When installing a new module, be sure to check its performance before the final sticker. Connect the plume, turn on the phone and check the touchscreen, image and sensors, which will save you time to re-disassemble in the event of marriage.
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Use the B-7000 or similar glue gel to fix the new screen, allowing you to adjust the position of the module in the first minutes and hold the structure securely after freezing.
Working with motherboard and cameras
If you want to replace the charging connectors or repair the power chains, you have to remove the motherboard, which is the most difficult step, requiring maximum concentration, the board is held by screws and firmly planted in the case.
Before removing the board, you need to turn off all the plumes: the main, camera plumes, volume and inclusion buttons, as well as antenna contacts. Antenna pins (golden "Petlets") should be put down very carefully so as not to break their plastic bases.
⚠️ Attention: Cameras in Redmi 9T They're very sensitive to dust, and even a microscopic villi that's on the camera matrix will create a black spot in all the photos. Try not to touch the lenses with your fingers and work in a clean room.
To retrieve the board, lift it slightly on one side, checking if any plume is caught. The movement should be smooth, without jerking, put the fee on an antistatic mat or a clean dry surface.
When you reverse-install, make sure all connectors match the response parts. Often, the "click" method is used, where the board stands in place with a slight click. However, in modern smartphones, it is better to rely on visual control of the match of connectors.
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The main challenge with the motherboard is that there are so many small plumes of different lengths, so take pictures of each step of the shutdown, so you don't have to guess where to plug in when you build it.
Assembly of the device and verification of functionality
The Xiaomi Redmi 9T is assembled in reverse order, but with some nuances in mind.The new glue for the back cover and screen should dry. It is recommended to press the edges of the device with rubber harnesses or put under a light press for 15-20 minutes.
First, plug in the battery and check the device's response, and if the screen catches fire and there's a vibration when you turn on, half the job is done, then consistently plug in the plumes of the cameras and sensors, checking them after each connection.
Twisting the screws cross-cross to ensure that the plates fit evenly. Do not drag the screws, especially those that go into the plastic case, this can lead to cracks inside the seats.
- 🔋 Connect the battery first
- 📱 Check the on-line before full assembly
- 🔩 Twisting the screws evenly
- 🧹 Remove the remnants of old glue
The final step is to put the back cover in place, make sure all antenna contacts are pressed by metal plates, and if you don't contact the antenna, you'll see a sharp drop in network and Wi-Fi signal strength.