Modern Xiaomi smartphones, whether budget models Redmi or flagship Black Shark, are structurally monoblocks, where the rear panel performs not only a protective function, but also an element of the rigidity of the case. The need to remove the back cover most often occurs when critical damage to the glass requires a full replacement, or when replacing the bloated battery when access to the battery from the back is impossible. Unlike older models with removable covers, modern devices require careful handling of the adhesive layer and high accuracy of actions.
The dismantling process is slow, as careless movement can lead to cracks on the side faces or damage to the plumes coming from the on button or fingerprint scanner. Before starting work, you must clearly understand that opening the case automatically voids the official manufacturer's warranty, if it is still valid. Your goal is to soften the adhesive composition and separate the panel without damaging the internal components that are tightly pressed against the body.
To successfully perform the procedure, you will need not only physical accuracy, but also a specialized tool that will provide safe access to the insides of the device. The use of improvised tools such as knives or thick needles is strongly discouraged, as they often lead to deformation of the frames and short circuit. Next, we will consider a detailed algorithm of actions that will help you safely dismantle.
Preparation of the workplace and the necessary tool
The quality of the workspace is the foundation of successful electronics repairs. You will need a smooth, well-lit surface, preferably with an antistatic mat, to eliminate the loss of small screws and protect components from static electricity. Component safety comes first, so make sure that the room is free of moisture and dust sources.
The basic toolkit should include a suction cup to lift the edge of the glass, a set of plastic mediators (scapulas) to dissect the glue and a thin metal scalpel or blade for the initial one, and an indispensable assistant will be a heat source: professional thermophen or, in extreme cases, a household heating pad capable of maintaining a temperature around 80-90 To work with screws, you need a precision screwdriver with a set of bits, most often in the format. PH00 or PH000.
- 🔧 Plastic blades and mediators for careful detachment of glue without scratches.
- 🌡️ Thermophen or heating pad for uniform heating of the back panel.
- 🧲 Magnetic mat or organizer for sorting screws of different sizes.
- 🧴 Isopropyl alcohol or special solvent of glue (B-7000) finish-clean.
Pay special attention to the organization of space: all screws should be laid out in the order in which they were removed, as in Xiaomi smartphones the length of fasteners can vary by fractions of a millimeter. Using an inappropriate screw in the hole for a long fastener can lead to a breakdown of the motherboard through, which will cause irreversible damage to the electronics.
⚠️ Warning: Before starting any work, be sure to turn off the device. If the phone does not turn on due to damage, try to discharge the battery to a minimum or act with utmost care so as not to cause a short circuit when the tools come into contact with the board.
Technology of heating and separation of the rear panel
A key step in determining the success of the entire operation is to properly heat the case.The adhesive layer used by Xiaomi is a thermoactive compound that softens as the temperature rises. Insufficient heating will lead to the fact that the glass will simply crack under the pressure of tools, and excessive - can damage. OLED-screen on the front or deform plastic elements inside.
Heat the back cover evenly, driving the thermophen or holding the device on the heating pad for 3-5 minutes. Periodically check the temperature with your finger: the surface should be hot, but not burning. After warming up, insert a thin blade or mediator into the junction between the frame and the glass, usually starting at the bottom corner or in the area of the charging socket, where the glue layer is often thinner.
Move the blade along the perimeter, creating a small gap, and immediately fix it with a plastic card or mediator. Don't try to remove the lid with a jerk - the glue must be cut throughout the contour. In models with a glass back cover, such as the Xiaomi Mi 9 or Xiaomi 13, the risk of chipping is especially high, so the movements should be smooth and progressive.
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If you use a household heating pad, cover the phone on top with a thin towel for better heat retention, but make sure the fabric doesn't catch fire when in contact with hot items.
Working with internal components and plumes
Once the back cover is removed, you can access the smartphone's internal device, but you can't rush to remove the protection from the motherboard. Most Xiaomi models have a plastic or metal plate underneath the back cover that covers the battery and the main components, which can be mounted on screws or also held on glue.
The first step is to disconnect the battery plume from the motherboard, a critical step that shuts down the device and prevents accidental short circuits as you disassemble it, and use a plastic blade to snap the connector away from using metal tools in the vicinity of the contacts.
| Component | Type of attachment | Risk of damage | Tool. |
|---|---|---|---|
| Battery | Glue tape + connector | High (puncture, bloating) | Plastic card, hair dryer |
| Maternity fee | Screws + plumes | Medium (steer break) | Tweezers, screwdriver. |
| Camera module | Glue + connector | Tall (lens scratch) | Plastic spatula |
| Dynamic (vibra) | Screws + connector | Low. | Screwdriver. |
When working with plumes, remember that they are extremely fragile: the plumes of the display, cameras and buttons are easily damaged with a nail or tool if you pull them at the wrong angle. Always disconnect the connectors strictly vertically upwards, swaying slightly from side to side if the connector is sitting tight.
What to do if the plume is broken?
Specifics of disassembly of models with adhesive battery
Many Xiaomi smartphones have their battery mounted on double-sided tape or on special stretching strips, and trying to tamper with a metal tool can damage the battery, which can lead to lithium fire, so the main method of dismantling is to reheat the back of the device (if the lid is already removed, you need to warm up carefully, through the protective plate) and use solvents.
Put isopropyl alcohol or a special solvent under the edges of the battery, allowing the liquid to penetrate the adhesive layer, which will significantly reduce adhesion, then you can use a plastic card to gently move the battery, and the movements should be progressive, without bending the battery itself.
- 🔋 Never puncture the battery with a sharp object – it will cause a chemical reaction and a fire.
- 🔥 Do not heat the battery directly with a hairdryer at temperatures above 60 degrees to avoid bloating.
- 🧤 Use protective gloves when working with damaged food items.
If your model has special pull-tabs, try pulling them carefully, but in older devices the glue may have dried and the tongues may break, so returning to the heat-and-solvent method is the only safe option.
⚠️ Attention: The billowing battery should not be subjected to mechanical pressure, and if you see that the battery is inflated and occupies the entire volume of the body, you need to remove it with extreme caution, trying not to puncture the shell.
Assembly and restoration of the tightness of the body
After the repair work, the assembly phase begins, which requires no less care than disassembly. Before installing the back cover, you must carefully clean the perimeter of the frame and the cover itself of the residue of old glue.
To fix the lid, apply a new layer of glue. You can use a special electronics glue (for example, B-7000 or T-7000), which remains elastic after drying, or use a ready-made adhesive tape cut along the outline. Apply a thin strip of glue, avoiding the composition on the camera, speakers and connectors.
☑️ Pre-glue check
Once the lid is installed, press it tightly around the perimeter. To better polymerize the glue and restore tightness, it is recommended to lock the smartphone with rubber harnesses or put it under the press (for example, under a stack of books) for several hours. Complete drying of the glue usually takes from 12 to 24 hours, depending on the humidity and temperature in the room.
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High-quality cleaning of the old glue frames is a guarantee that the new lid will sit smoothly, without gaps, and the phone will be protected from dust.
Typical errors and precautions
Even experienced craftsmen can make mistakes that are fatal in the case of beginners. One of the most common problems is damage to the fingerprint scanner plume, which in Xiaomi models is often glued to the back cover. When the lid is not neatly removed, this plume breaks off and the scanner stops working.
It is also common to see damage to the glass of the main camera. When working with metal tools near the lenses, it is very easy to leave a scratch on the camera's protective glass or even break it. This will lead to glare in photos and loss of image quality. Always use only plastic tools near the optics.
- ❌ Do not turn off the battery before working with other plumes.
- ❌ Do not use superglue (cyanacrylate) to stick the lid – it emits the pairs settling on the cameras and makes the lid non-removable.
- ❌ Do not leave your phone unattended on a warming surface to avoid overheating.
Remember that the glass back covers in the Xiaomi Mi series and the flagship Redmi Note are extremely fragile during a spot impact, so when working with a thermophen, avoid sharp temperature changes that can cause thermal shock and cracks.