Modern smartphones of the brand Xiaomi and its sub-brand Redmi often require intervention from the inside. The reason may be a broken rear window, the need to replace the battery, or install a new camera. Owners often wonder how to open the Android Redmi cover in order to carry out repairs themselves. Although manufacturers strive to make devices monolithic, a competent approach allows the procedure to be carried out without fatal damage.
The dismantling process requires patience, special tools and an understanding of the design of a particular device. Models with a plastic back panel are easier to remove than versions with glass covers glued with strong adhesive. Incorrect actions can lead to cracks in the glass or breakage of thin cables connecting components. Therefore, before starting work, it is necessary to carefully study the sequence of steps and prepare the workplace.
In this article we will analyze in detail the technology for opening the cases of popular models of the line Redmi Note and budget versions. You will learn about the nuances of heating the glue, the correct use of mediators and precautions. Compliance with the technology will allow you to maintain the presentation of the device even after disassembly.
Preparation of the workplace and necessary tools
The success of the operation depends 80% on what and where you work. You will need a flat surface with good lighting, preferably an antistatic mat so that small screws do not get lost or roll under the furniture. The main tool for opening is a technical hair dryer or heat gun, capable of uniformly heating the perimeter of the case to a temperature of 70-80 degrees Celsius.
In addition to the heat source, it is critical to have a set of plastic mediators (blades). Do not use metal tools as they may damage internal components or shorten the battery terminals. You will also need a suction cup to create an initial gap and a thin fishing line or a special string for cutting the adhesive layer.
- 🔧 A technical hair dryer or a construction hair dryer with temperature control.
- 🛠 A set of plastic paddles and picks of different thicknesses.
- 🧲 Magnetic mat or organizer for screws of various sizes.
- 🧴 Isopropyl alcohol or special glue solvent (B-7000).
⚠️ Attention: Never use household lighters or gas burners to warm up the case. Local overheating can lead to fire of the battery or deformation of the plastic frame.
Also prepare tweezers with curved ends for easy prying of the cables. If you have a model with a glass cover, it is recommended to purchase a new cover or high-quality glue in advance, since the old frame may become deformed when removed. Work in a hurry without preparation often ends with the purchase of a new smartphone instead of repair.
☑️ Readiness for repair
Design features of Redmi and Xiaomi cases
Understanding how your gadget works will save it from breakdown. Budget models such as Redmi 9A or Redmi 10C, often have a completely plastic body that is held in place by latches and a small amount of glue. In such cases, minimal heating is required, and the main emphasis is on carefully snapping off the plastic clips around the perimeter.
More expensive models, for example, series Redmi Note 10 or Redmi Note 12, are equipped with glass back panels. The glass is glued along the entire perimeter with a powerful adhesive. Here, mechanical force without first softening the glue is guaranteed to lead to the destruction of the glass. Inside such devices there is often a wireless charging or NFC module that is attached directly to the cover.
Hidden risks when disassembling glass
If you remove the glass cover carelessly, you can damage the polarization layer or leave chips on the edges that will be noticeable even in the case. In addition, glass fragments can get inside the case and damage the motherboard.
In some modifications, a compartment for memory cards and SIM cards is hidden under the back cover, which can be accessed without completely removing the panel. However, to replace the battery or screen, you will have to remove the entire cover. Always check the specifications of your specific model before starting work, since even within the same series the design may differ.
| Smartphone model | Cover material | Mounting type | Difficulty of opening |
|---|---|---|---|
| Redmi 9A / 10A | Plastic | Latches + glue | Low |
| Redmi Note 10 Pro | Glass | Glue around the perimeter | High |
| Redmi Note 12 | Plastic/Glass | Glue + latches | Medium |
| Poco M4 / M5 | Plastic | Latches | Low |
Please note that the presence of a logo Xiaomi or Redmi on the back panel does not always indicate the identity of the design with other models of the brand. Engineers often change component suppliers and assembly methods. Therefore, there is no universal instruction “for everyone”, and you need to focus on visual inspection and tactile sensations when warming up.
The process of warming up and creating an initial gap
The first stage is heating the adhesive layer. Turn on the hair dryer and set the temperature to about 80-90 degrees. Direct the flow of hot air strictly along the perimeter of the device, evenly moving the hair dryer along the edges. Do not hold the hair dryer at one point for more than 3-4 seconds to avoid local overheating of the matrix or battery.
The heating process usually takes from 2 to 5 minutes depending on the thickness of the glass and the amount of glue. You can tell that the glue has softened by a change in the color of the indicator strips (if they are under the glass) or simply by touch - the plastic should become warm, but not scalding. After this, quickly but carefully apply the suction cup to the bottom of the back cover.
If the suction cup does not stick to smooth glass, drop a drop of water or oil on the contact point - this will improve adhesion and create the necessary vacuum to pull the cover back.
Pull the suction cup up, creating tension. At the moment of tension, insert a thin plastic pick or a safety razor blade into the resulting micro-gap (with great care). Your goal is to cut the glue and not lift (pry) the lid up. The movements should be cutting along the plane of the body.
⚠️ Attention: Do not try to pry off the cover in the corners of the device right away. It is in the corners that the most fragile elements and the main latches are located. Start from the bottom edge or side, where there are no cameras or buttons.
As soon as the pick has entered the gap by 2-3 millimeters, you can begin to move it along the perimeter. If you feel a lot of resistance, stop and warm the area again. Applying force to cold glue will cause the glass to crack along the stress line.
Technique for detaching the lid and working with latches
After you have passed the pick or fishing line around the entire perimeter, the lid should begin to separate. However, do not rush to remove it completely. Connections may remain inside the housing. In some models, a fingerprint scanner or a flash module is glued to the back cover, connected by a cable to the motherboard.
Carefully lift the edge of the cover and inspect the interior. If you see thin cables running from the cover to the board, do not yank the device. First you need to disconnect the loop connector. To do this, use a plastic spudger to pry the connector latch up and then remove the plug.
- 👀 Visually check for connections between the cover and the body.
- ✋ Disconnect the fingerprint scanner cable or NFC antenna, if any.
- 🧹 Remove any remaining old glue from the frame before installing a new cover.
Sometimes the latches are located not only at the edges, but also in the central part, especially in the area of the camera block. In such cases, additional force is required, but only after the glue has completely softened. The plastic of the latches can be fragile, especially on devices that have been in use for several years.
Put the removed cover on a safe surface, preferably on a soft cloth, so as not to scratch its outer side. If you plan to reuse it, make sure that it did not become deformed during the removal process. The curved cover will not fit tightly to the body, which will disrupt the moisture protection and aesthetics of the device.
Safety measures when working with the battery
After removing the cover, you get direct access to the battery. This is the most dangerous stage of work. Lithium-ion batteries are sensitive to punctures and shock. Damage to the battery casing may result in fire or chemical burns. Never use metal tools in close proximity to the battery.
If your goal is to replace the battery, you must first disconnect the battery cable from the motherboard. Typically the connector is located under a metal protective plate that is secured with several screws. Use a Phillips screwdriver of the correct size (usually PH00 or PH000) to remove the protection.
⚠️ Attention: It is strictly forbidden to bend the battery or try to pry it with sharp objects. To remove the battery, use a special extractor with a suction cup or a plastic card moistened with alcohol, carefully inserting it under the battery.
In older models Redmi the battery can be glued to the case with double-sided tape. Newer versions often use a quick release mechanism or less adhesion adhesive. If the battery does not yield, slightly warm its back side (through the screen, if you are removing the screen, or carefully around the perimeter), but do not overheat!
When installing a new battery, make sure that the connector is seated until it clicks. An incomplete connection may cause your phone to become unstable or turn off suddenly under load. Also check whether the display cables are pinched during assembly.
Assembling the device and sealing the case
Reassembly requires no less care than disassembly. Before installing the cover, you must thoroughly clean the frame of the case and the cover itself from any remaining old glue. Use isopropyl alcohol and a lint-free cloth. The surface must be perfectly clean and free of grease for reliable fixation of the new adhesive layer.
Apply new adhesive (for example, B-7000 or special adhesive for electronics) in a thin strip around the perimeter of the frame. Avoid getting glue inside the case, camera or speaker. Let the glue dry for 1-2 minutes until it is slightly sticky, as indicated in the instructions for the adhesive.
The quality of sealing directly affects the dust protection of the device. A poorly glued lid will cause moisture to get inside at the first rain or high humidity.
Carefully align the cover with the body, starting from the top, to correctly orient the cutouts for the camera. Press the lid firmly around the entire perimeter. For better fixation, you can use rubber bands, stretch them crosswise over the case, and leave the device in this form for 30-60 minutes until the glue is completely polymerized.
After assembly, wipe the case from excess glue that may have protruded along the edges. Turn on the device and check the functionality of all functions: sensor, buttons, cameras and communication modules. If everything works correctly, the repair can be considered successful.
ℹ️ Information: The characteristics of adhesive compositions and the design of smartphones may change in new batches. Always check the official documentation or specialized service manuals for your specific device revision.
Frequently asked questions (FAQ)
Is it possible to open the Redmi cover without a hair dryer?
Technically possible, but extremely risky. Without heating, the glue remains hard, and attempting to pry the lid off will cause it to crack. The exception is the most budget models with latches, where there is a minimum of glue, but even there the risk of damaging the plastic is high.
What to do if after assembly the phone does not turn on?
Most likely, the battery or display cable was not fully inserted. It is necessary to carefully open the case again (B-7000 glue allows you to do this again) and reconnect all connectors, making sure that they are fixed.
Will the moisture protection be broken after self-disassembly?
Yes, the factory sealing will be broken. Even when using high-quality glue, the level of water protection will be lower than the factory IP53/IP54. It is not recommended to immerse a repaired phone in water.
How to remove glue residue from glass?
Use isopropyl alcohol and a plastic card. Never use blades or scissors to clean the glass, as you are guaranteed to leave scratches that will glare in the light.
How long does the back cover glue take to dry?
Primary adhesion occurs after 5-10 minutes, but to gain full strength and tightness, it is recommended to keep the device under load (rubber bands) for at least 1 hour, and preferably 2-3 hours.