The process of dismantling the back of the Xiaomi Redmi 8 smartphone is the first and critical step when replacing the battery, screen or other internal components.The unit’s solid design involves the use of a powerful adhesive layer, making the procedure of removing the lid difficult for beginners without proper preparation. Any careless movement can damage the glass surface or, worse, tear the internal plumes.
Unlike older models with removable batteries, modern gadgets require the use of special tools and strict adherence to temperature. Redmi 8 is equipped with double-sided glass Gorilla Glass, which, despite its strength, is very sensitive to spot impacts and sharp pressure drops. Before starting work, you need to make sure that you have all the necessary equipment and free space.
Ignoring the heating stages of the case is often a fatal mistake, leading to chips and cracks. The adhesive base used by the manufacturer becomes extremely rigid at room temperature, and trying to separate the lid "cold" is guaranteed to lead to glass breaking. In this guide, we will detail each step to minimize risks.
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Before starting work, be sure to back up all data, as the repair process may require the battery to be turned off, which sometimes causes a reset of security settings.
Tools and workplace preparation required
A high-quality disassembly is impossible without a specialized set of tools that differ significantly from standard household accessories. You will need a hair dryer (building or powerful household) to uniformly warm the perimeter of the body, as well as a suction cup to create an initial gap. The use of knives or sharp objects at the initial stage is strongly discouraged, since there is a high risk of damaging the display from the back side.
To crack the internal latches and work with thin plumes, you will need plastic mediators (scapula) and tweezers with curved ends. Metal tools should be used with extreme caution, mainly to clean the frame of old glue, but not to affect the internal components. Microfibre and isopropyl alcohol will help degrease the surfaces before the final assembly.
- 🛠️ Thermophen or heating pad for softening glue around the perimeter.
- 🧲 Magnetic mat for systematization of screws of different sizes.
- 🧴 Isopropyl alcohol or special solvent B-7000 remove adhesive residues.
- 🔧 A set of screwdrivers with a cross sting (usually) PH00 or PH000).
The organization of the workspace is as important as the availability of tools: provide good lighting to see the smallest details and fasteners. A lost screw or an improperly connected connector can cause the device to fail after assembly, so order and attentiveness are your main allies.
☑️ Preparation for disassembly
Technology of heating the body and creating a gap
The first stage of physical exposure to the smartphone is heating. - Xiaomi Redmi 8 It has a glass back panel that is glued to a metal frame or plastic base around the perimeter, and the device should be heated evenly, driving a hair dryer along the edges during the course of the process. 2-3 The temperature should not exceed 80-90 degrees Celsius, so as not to damage OLED-battery.
After warming up, you need to quickly but carefully install the suction cup at the bottom of the back cover, closer to the center, avoiding the area of the chamber. Pull the suction cup up, creating tension, and insert a thin plastic blade into the resulting microscopic gap. If the lid does not respond, the heating procedure must be repeated, in no case using excess force.
⚠️ Warning: Don't heat up the center of the smartphone where the battery is located. Local overheating of the lithium-ion battery can cause it to bloat or catch fire!
Move the shoulder blade along the perimeter, gradually cutting through the adhesive layer. The movements must be sliding, parallel to the plane of the screen, so as not to damage the internal components. The adhesive layer can have different densities in different areas, so you can add a little heat in the resistance areas.
Why can’t you use a metal scalpel?
Disconnection of internal plumes and modules
Once the lid is completely separated from the body, don't rush to put it aside. Often, the fingerprint scanner plume or other connectors can be glued to the inside of the panel or have a very short length.
Carefully inspect the space between the lid and the main board. If you see thin cable connections, gently disconnect them using a plastic shoulder blade or nail. In the Redmi 8, the fingerprint scanner is often integrated into the back panel, and its plume requires special attention when extracting.
Then you have to access the main board, and you have to unscrew all the visible screws that attach the plastic safety bar that covers the connectors of the battery and the display, and the protective bar prevents the plumes from being accidentally turned off and protects the contacts from dust.
- 🔌 Battery Disconnection: First of all, disconnect the battery plume from the motherboard to turn off the device.
- 📱 Display module: Carefully click the connectors of the display and touch screen.
- 🔊 Sound module: If necessary, remove the lower board with the charging connector by unscrewing the locking screws.
Only after all communications are completely disconnected can the back cover be permanently removed to safety, and plumes are one of the most vulnerable elements of the structure, and their damage when disassembled is extremely common.
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The main rule of dismantling: never pull the lid by force, if you feel resistance - it means that somewhere there is not a peeled area or a connected plume.
Design analysis and fastening table
The internal layout of the Xiaomi Redmi 8 is modular, making it easier to replace individual nodes, but requires care when assembled. Different screws can have different lengths and threads, so entanglement can lead to plastic damage or even a motherboard failure.
Below is a table of the main fasteners you will encounter during the disassembly process. Pay attention to the color and marking of the screw heads, if any.
| Type of screw | Location. | Number of | Features |
|---|---|---|---|
| M1.4 screw | Protective fee bar | 2-4 pcs. | Short, neat, neat. |
| M1.6 screw | Battery attachment | 2 pcs. | Often hidden under a sticker |
| M2.0 screw | Lower charge (charging) | 5-6 pcs. | Long, holding the frame. |
| Self-inflicted | Loading of the dynamic module | 2 pcs. | Locking the speaker in the body |
When you build back, follow this pattern very closely. A long screw screw screwed into a short hole can get into the board components and split the textolite or damage the screen on the back. Use a magnetic mat to spread the screws in the order you twisted them.
Pay special attention to the area around the cameras. The camera modules in Redmi 8 can have their own mount or simply be inserted into the slots. Before removing the main board, make sure that all screws around the cameras are twisted.
Replace the battery and fix problems
The most common reason for dismantling Xiaomi Redmi 8 is to replace the worn battery. After removing the protective strips and disconnecting the plumes, you will find the battery glued to the case.
Never try to smack the battery with a knife or screwdriver. A puncture of a lithium-ion battery causes an instant chemical reaction to release heat and smoke. Use isopropyl alcohol by dripping a few drops under the battery to dissolve the glue, and let it soak up for a couple of minutes.
⚠️ Warning: If the battery is swelling, treat it with extreme caution. Do not press it or mechanically damage it, as this may lead to ignition.
After removing the old battery, clean the seat of glue residue. The new battery should be installed smoothly, without distortion. Before the final sealing of the case, be sure to check the operation of the device by connecting the plumes and turning on the phone.
A common problem after assembly is a broken fingerprint scanner or touchscreen, which means that the connector is not fully up or damaged during assembly, in which case you will have to disassemble the device again and reconnect the plumes.
Final assembly and seal check
The assembly is done in reverse order. Make sure all plumes are snapped to the characteristic click sound. Protective strips should be flat, clear. Before applying the new glue, wipe the frame and cover with alcohol, removing all greasy stains and dust.
Use a special B-7000 glue or ready-made adhesive frames designed for Xiaomi models to fix the lid. Apply a thin strip of glue, avoiding getting into the camera and sensors. After connecting the parts of the case, lock the phone with stationery gums for 30-60 minutes to polymerize the adhesive.
- 🧹 Cleaning: Carefully remove dust from the inside of the glass before gluing.
- 🧪 Glue: Use only specialized electronics formulations.
- ⏱️ Time: Let the glue dry for at least an hour before first switching on.
After drying, check all the functions: sound, vibration, cameras, Wi-Fi and cellular communication. the tightness of the case will not be restored completely (as in the factory), but the tight fit of the cover will provide protection from dust and random drops.