Xiaomi Redmi 9 is one of the most popular budget smartphones, but even it is not immune to breakdowns. Most often users face the need to replace the battery, speaker or clean the connectors from dust. However, the disassembly of the case of this device has its own nuances: adhesive base, fragile plumes and the risk of damage to plastic latches. In this article, a step-by-step instruction with photos, videos and expert tips on how to remove the back cover of the Redmi 9 without consequences.
Before you start screwdrivers, it's important to understand that the design of the Redmi 9 (codenamed lancelot) is different from Xiaomi's flagship models. There's no removable battery, and the body is glued around the perimeter, which makes it difficult to access the insides. We'll tell you what tools you need, how to avoid common mistakes and what to do if the lid doesn't work, and you'll learn when it's best to trust the service center to sort it out, which will save you nerves and money.
Preparation: security tools and measures
To take the Xiaomi Redmi 9 cover off carefully, you'll need a special set of tools. Don't try to get by with the tools you can get by (knives, credit cards or toothpicks) - this is almost guaranteed to lead to scratches on the body or broken latches.
- 🔧 Plastic mediator or suction cup (for initial lid tweaking) suited for a set for repairing smartphones with thin blades.
- 🔥 A dryer or a thermo-air station (at least 1000 watts) needed to soften the adhesive around the perimeter of the body.
- ⚙️ The screwdriver. PH00 (You can use a screwdriver to unscrew the screws under the lid!
- 🧲 Magnetic mat or container (to avoid losing small details) screws in Redmi 9 are tiny and easily lost.
- 📸 Smartphone to capture the process. Take pictures of each step, and that will help you get the device back together properly.
Important: before disassembling completely turn off the smartphone and remove SIM-The battery in Redmi 9 doesn’t physically shut down, so the risk of short circuits with careless actions remains.If you’ve never disassembled a smartphone, practice on an old device or watch video instructions (links are at the end of the article).
⚠️ Warning: Do not use metal tools to lid the lid! Even a small scratch on an aluminum frame can become a hotbed of corrosion, and plastic latches easily break when exposed to rough exposure.
Step-by-step: how to remove the cover from Redmi 9
Now, the most critical step is to follow the instructions in strict order, and skipping the steps can damage the plumes or the display, and the whole process will take about 20 to 30 minutes, if you act carefully.
Step 1: Heating the body
The glue that the Redmi 9 cover is glued to softens at 60-80°C. Use the dryer at minimum power, keeping it 10-15 cm from the body. Heat around the perimeter, paying special attention to the corners - there is usually more glue. Heating time: 2-3 minutes.
Critical error: Do not overheat one area for longer than 10 seconds! this can damage the battery or display.
Step 2: Filting the lid
When the glue softens, attach the suction cup closer to the bottom edge of the smartphone (near the USB-C connector). Carefully pull up, there should be a small gap. Insert a plastic mediator into it and slowly lead along the body, separating the lid. If you feel resistance, warm up the area again with a hairdryer.
Don’t push too hard – the plastic is fragile!
Keep the mediator at an angle of 30-45 degrees.
Don’t try to separate the lid completely the first time – work a little bit on each side.
If you hear a crunch, stop and check if the latches are broken.
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Step 3: Unscrewing the screws
When the lid is separated, you'll see 10 screws of different lengths (4 in the top and bottom, 2 on the sides). Carefully unscrew them with a PH00 cross screwdriver and spread them out on the magnetic mat in order of extraction, which will help you not to confuse the build. The screws next to the camera are usually shorter than the others!
⚠️ Warning: Do not use a magnetic-tipped screwdriver, which can damage the compass or Hall sensor in your smartphone. If the screw fails, do not apply force: check if the screwdriver size is suitable for the screwdriver.
Step 4: Disconnecting the plumes
Once you remove the lid, you'll see the battery pack and some plumes leading to the motherboard, and to separate the lid completely, you'll need to detach:
- Fingerprint scanner plume (located under the battery).
- Main camera plume (black, with a latch).
- Antenna contacts (thin metal strips on the sides).
To detach the plumes, use a plastic spatula -- pull the latch up, then carefully pull the plume out. Don't pull the wires!
What to do if the plume is broken?
Common Mistakes and How to Avoid Them
Even experienced craftsmen sometimes make mistakes when parsing the Xiaomi Redmi 9. We have collected the TOP-5 most common problems and ways to prevent them.
| Mistake. | Effects of consequences | How to avoid |
|---|---|---|
| Too much heat by a hair dryer | Deformation of plastic, detachment of the display, battery damage | Keep the hair dryer at a distance of 10-15 cm, do not heat one point longer than 10 seconds. |
| Use of metal tools | Scratches on the frame, broken latches, short circuit | Only plastic mediators and shoulder blades from the repair kit |
| Confused screws during assembly | Flawed fit of the cover, damage to the board | Spread the screws in order on the magnetic mat |
| Dramatic disconnection of plumes | Broken contacts, a broken camera or fingerprint scanner | Finish the latch, not pull the plume. |
| Disassembly without battery shutdown | Short circuit, burnt-out fee | Disconnect the battery connector immediately after removing the cover |
If you do make a mistake, don't try to fix it yourself, for example, an overheated battery can swell in a few days, and a damaged plume can cause artifacts on the screen, in which case you should contact the service immediately, informing you first what you did with the device.
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Before assembling your smartphone, wipe your internal contacts (such as antennas) with an alcohol wipe, which will improve the network signal and Wi-Fi after repair.
When it is better to trust professionals
Despite its apparent simplicity, the Xiaomi Redmi 9 can be expensive to repair if you don’t have experience.
- 🔋 The battery is swollen or deformed, and its replacement requires special equipment (heat-glue gun) and safety knowledge.
- 📱 The display is cracked or the sensor is gone, and in this case, you have to change the entire module, and that requires an industrial dryer and experience with adhesives.
- 💧 The smartphone has been in water. The corrosion on the board may not be visible immediately, but after a week the device will stop turning on.
- 🔌 Problems with charging (the connector does not work) USB-C). Often it is not the connector itself that is to blame, but the power controller on the board - its repair requires a soldering station.
The cost of parsing in the service usually does not exceed 500-1000 rubles, but you get a guarantee for work. If you decide to act independently, take a picture of each step and save all the screws / parts in separate containers, which will simplify the reverse assembly.
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The rule of thumb is, if you're not 100% sure of what you're doing, don't take any risks. A damaged board or display will cost you a lot more than a master's service.
What to do after successfully removing the lid
Congratulations! If you've finished reading this section, the Redmi 9 cover has been successfully removed, and now you can start your main task: replacing the battery, cleaning the connectors or repairing the speaker.
- Disconnect the battery. Even when it's off, it puts voltage on the board. Find a battery connector (usually black, with red and black wires) and gently disconnect it with a plastic blade.
- Look for oxidation marks, bloated capacitors or burnt tracks, and if anything is suspicious, take a photo and show it to the master.
- Clean your insides of dust. Use a soft brush or a compressed air balloon. Don't blow with your mouth. Saliva can get into your contacts!
If you want to replace your battery, consider the original battery for the Redmi 9 with a capacity of 5020 mAh (article MB-J20BR). Don't buy cheap ones - they can swell in a few months. To install a new battery you will need double-sided tape or B7000 glue.
Video instructions and additional resources
For clarity, we recommend watching the video analysis of Xiaomi Redmi 9 from trusted authors.
- 🎥 Complete review of Redmi 9 with battery replacement (FixIt Yourself channel) Detailed process of disconnecting plumes and installing a new battery.
- 🎥 How to remove a hair dryer lid (Gadget Repair channel) An alternative method using isopropyl alcohol to soften the glue.
- 🎥 Cleaning the Redmi 9 charging connector (TechDoctor channel) Shows how to clean properly USB-C dust-port.
It is also useful to learn the datashit for Redmi 9, which can be found on the 4PDA or XDA Developers forums for Xiaomi Redmi 9 lancelot schematic, and will help identify components on the board if soldering is required.
1. Is the battery connected?
2. Are the plumes (especially the fingerprint scanner) clogged?
3. whether all screws are twisted (the missing screw can close the contacts).
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