Xiaomi Mi 9T — One of the brand's most popular smartphones, combining powerful iron with stylish design, but what to do if you need to replace the battery, clean the connectors or get out? SIM-Disassembling this device requires care: there is no removable panel, like the flagship Samsung or Google Pixel, and the body is glued around the perimeter. In this article, a step-by-step algorithm with a photo, a list of tools and critical nuances that will protect your Mi Mi. 9T lesions.
Let me warn you right away, if you've never taken a smartphone apart, you should go to a service center, and the adhesive under the lid is solid, and the fingerprint and camera plume is easily damaged, but if you're willing, follow the instructions carefully, and we've taken into account all the weaknesses of the Mi 9T design that often break when you repair yourself.
Preparation: what will be needed for the disassembly
Before you start, make sure you have everything you need. Xiaomi Mi 9T does not understand with your bare hands — without special devices, you risk scratching the body or tearing plumes. Here is the minimum set:
- 🔧 Plastic mediator (or guitar) - to separate the cover and body. Metal tools leave scratches!
- 🔥 A hair dryer or a thermo-air station to soften the glue, even a household hair dryer at maximum power will do.
- 🧲 Suction cups (2 pcs) - help to lift the cover after heating. It is better to use small ones, with a diameter of 3-4 cm.
- ⚙️ Screwdriver. T3 — for unscrewing screws under the lid. 9T cruciform screws are used.
- 📦 The screw container is designed to keep the small parts intact.
- 🧴 Isopropyl alcohol (90%+) — Acetone or solvents should not be used to clean glue residues!
Also, get a clean, light-filled workplace, ideally a white tablecloth (so you can see the little details) and a desk lamp, and if you're taking your smartphone apart for the first time, videotape it, and it'll help you get it back together without any errors.
⚠️ Warning: Do not use knives, screwdrivers or other sharp objects to lid the lid! Even a slight pressure can damage the plume of the fingerprint scanner that runs along the left edge of the case.
Step 1: Turn off and heat the body
The first step is to completely shut down the power, and even if the battery is almost dead, turn off the Mi 9T through the menu or press the power button for 10 seconds, which will prevent short circuits from accidentally coming into contact with the board.
Next, warm up the adhesive around the perimeter of the lid. Turn the hair dryer on the maximum temperature (if there is an adjustment, set 80-90 ° C) and evenly warm up the edges of the smartphone for 2-3 minutes. Keep the hair dryer at a distance of 5-7 cm, constantly moving it so as not to overheat one area.
- 🔋 The bottom part - there is glue usually the strongest.
- 📱 They will be warmed up longer because there is a buildup of glue.
- 🔄 Areas around the buttons - here the cover fits tighter.
If the plastic gets too hot to touch, pause for 1-2 minutes. Overheating can damage the battery or display.
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If you don't have a hair dryer, you can use hot water: pour it into a deep plate, put the smartphone up with the screen and hold it for 1-2 minutes above the steam, but this method is less reliable and requires caution!
Step 2: Rear cover separation
After warming up, we'll start to gently subdue the lid, and the key is to take your time and not make too much effort. Take a plastic mediator and start at the lower right corner (near the USB-C connector), insert the mediator into a gap between the lid and the body by 1-2 mm and slowly lead along the edge.
Once the lid starts to rise, place the suction cups closer to the top of the smartphone (where the camera is located). Pull them up carefully, while pushing the mediator around the perimeter. If the lid does not respond, do not pull harder! Return to the hair dryer and warm up the problem area for another 30 to 60 seconds.
⚠️ Attention: In Xiaomi Mi 9T The fingerprint scanner plume is glued to the inside of the lid. If you pull it hard, it will break! Separate the lid slowly, especially in the upper left corner.
When the lid is 2 to 3 mm apart around the perimeter, remove the suction cups and continue to work as a mediator. You don't have to remove the lid completely yet, it's still on the plume. You move on to the next step.
Power out | Cover warmed up around the perimeter | Mediator inserted in the lower corner | Suction cups installed at the top | Print plume not stretched-->
Step 3: Disabling the fingerprint scanner plume
Now the most important thing is to unplug the plume. Lift the lid to the corner 45.° And you look inside. You'll see a thin orange or black plume going from the fingerprint scanner to the motherboard, and it's attached with a small latched connector.
To disconnect the plume:
- Take a plastic spatula or tweezers.
- Carefully lift the black latch of the connector (it is located on the motherboard).
- Pull the plume towards the lid - it should come out effortlessly.
If the latch doesn't lend itself, don't push harder! Try wiggling it left and right a little bit. Damage to this connector is the most common cause of a missing fingerprint scanner after disassembling the Mi 9T.
What to do if the plume is broken?
Comparison of Disassembly Methods: Which is Better?
There are several ways to remove the Xiaomi Mi 9T cover, but not all of them are equally safe. In the table below, compare the most popular methods with pros and cons.
| Method | Pluses | Cons | Risk of damage |
|---|---|---|---|
| Fen + mediator | Safe for the most, suitable for beginners | It takes time to warm up, you need a hair dryer. | Low. |
| Hot water/steam | No need for a hair dryer, suitable for emergencies | Moisture can get inside, the risk of overheating the battery | Medium. |
| Special glue solvent | Quickly softens glue, minimal effort | Toxic, can damage plastic or rubber seals | High-pitched |
| Metal spatula | Quickly handle the glue. | Scratches on the body, the risk of damage to plumes | Very tall. |
As you can see from the table, the hair dryer and plastic mediator method is the most reliable, it takes longer, but minimizes the risks. If you're in a hurry, you can combine the hair dryer with isopropyl alcohol (a few drops around the perimeter after warming up), but don't overdo it - the alcohol can dissolve the marking on the board.
Frequent Mistakes and How to Avoid Them
Even experienced masters sometimes make mistakes when disassembling Xiaomi Mi 9T. Here. TOP-5 Failures that lead to failures:
- 🔥 Overheating of the body - if you hold the hair dryer too close, you can melt plastic clips inside or damage the battery.Optimum distance: 5-7 cm.
- ⚡ A sharp lid pull, the fingerprint scanner plume is glued to the lid, and if you pull it, it will break. Always check if the connector is disconnected!
- 🔧 Using inappropriate tools – metal blades scratch the body, and too thick mediators break clips.
- 📱 Incorrect assembly - if you forget to connect the scanner plume or poorly glue the cover, there will be problems with tightness.
- 🧲 Loss of screws in Mi 9T They use screws of different lengths, and if you mix them up when you build them, you can damage the board.
To avoid these mistakes, follow the checklist from the previous section and take your time. If the lid doesn't respond, then the glue is not warm enough. It's better to spend an extra 5 minutes warming up than repairing the smartphone later.
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The most vulnerable part of disassembling the Mi 9T is the fingerprint scanner plume. Always disconnect it first and check the integrity before assembly!
Build: How to put everything back in place
When all the work inside is done, start building back.
- Clean the glue residues from the lid and body with isopropyl alcohol.
- Apply a new glue (e.g. B-7000 or 3M double-sided Scotch) with a thin strip along the perimeter.
- Connect the fingerprint scanner plume - make sure that the connector latch is fixed with a characteristic click.
- Line the lid and press gently starting at the top (where the camera is) then walk around the perimeter to make the glue grab.
- Turn the screws backwards. 9T There are 3 types of screws: 🔩 Short (length 2 mm) - for fastening the cover. 🔩 Medium (3 mm) – for fixing the fee. 🔩 Long (4 mm) - for mounting the camera.
After assembly, turn on the smartphone and check:
- 📱 Is the fingerprint scanner working.
- 🔋 Whether the battery is charged (if the charging plume is turned off).
- 📶 Is there a network (antenna plumes may have moved).
⚠️ Warning: If the smartphone doesn't turn on after assembly, check if you forgot to plug in the battery plume or display. 90% of the time, that's the problem.