Modern smartphones like the Xiaomi Redmi Note 5 are designed with aesthetics and minimal gaps between parts, which greatly complicates the process of their maintenance. Owners often face the need to get to the internal components of the device to replace broken glass, clean the dynamic grid from dust or, most often, to install a new battery. Self-disassembly saves a significant amount on the services of the service center, but requires extreme care and understanding of the physical properties of the materials from which the gadget is made.
The process of removing the back panel on this model is radically different from the old phones with removable covers, because it uses a strong adhesive layer around the perimeter of the case. Patience and proper heating are key factors in success, as the glass at low temperatures becomes brittle and can burst from the slightest pressure. Before starting any manipulations, you need to prepare a workplace with good lighting, so as not to lose small screws and damage the plumes.
In this article, we will detail an algorithm that will allow you to safely separate the rear window from the frame of the case without damaging the fingerprint scanner and other sensitive modules. You will learn which tools are really necessary and which can harm, and get answers to frequent questions arising during the repair process. Safety above all, so follow each step of the instructions so that your Redmi Note 5 continues to please you with stable operation after recovery.
Tools and workplace preparation required
For high-quality disassembly of the smartphone is not enough to have at hand only a screwdriver and a knife, as this combination is almost guaranteed to lead to damage to the body or injury. You will need a specialized set of tools that will provide control over the process and minimize risks. The main tool for working with the adhesive layer is a hair dryer, preferably a building with temperature control, although in extreme cases a powerful household hair dryer will work, but you will have to warm longer.
The second critical element is suction cups and thin plastic mediators that allow you to penetrate the gap between the glass and the frame without the risk of short circuit or scratches. Metal tools such as blades or needles are strongly discouraged, as they can damage antenna plumes glued to the inside of the cover, or break through the battery.
- 🔧 Set of screwdrivers: mandatory presence of a cross screwdriver size PH00 or PH000 motherboard screw-twisting.
- 🔥 Heat source: building dryer set to temperature near 80-100 degrees Celsius, or heating pad for uniform heating.
- 💳 Plastic cards: old bank cards or special blades for cutting the adhesive layer around the perimeter.
- 🧲 Magnetic mat: for sorting screws of different lengths, so as not to confuse them when assembling.
Preparing the workspace is also important: the table surface should be clean, flat and not conduct static electricity. It is recommended to cover the table with white paper or light fabric, on which small details are clearly visible if they accidentally fall, organizing the process will help to avoid chaos when screws from different nodes mix, which can lead to improper assembly and damage to the thread.
☑️ Preparation for disassembly
The process of heating and separation of the rear window
The most important step in the integrity of the back panel is to properly heat the adhesive compound. The Redmi Note 5 back cover is made of glass, which can crack when temperatures drop sharply, so you need to heat the device gradually and evenly. Direct the flow of hot air strictly along the perimeter of the case, lingering on the corners and faces, where the glue layer is usually thicker, for 2-3 minutes.
⚠️ Warning: Never heat the center of the back cover too intensely, as there is a battery underneath that can swell or ignite when overheated above 100 degrees.
Once the case is well warmed, try to gently suction the glass with a suction cup at the bottom, closer to the charging connector, where there is usually the least electronics. Create a vacuum, pull the suction cup upwards, forming a microscopic gap, and immediately insert a thin plastic mediator or a safety knife blade. Don't try to force the lid off if it doesn't lend itself - this is a sure sign that the glue is not softened enough and additional heating is required.
Move a plastic card or a mediator along the perimeter, cutting the adhesive layer with translational movements. It is important to feel resistance: if the tool is tight, then the glue is frozen, and the heating procedure must be repeated. Exercise special caution at the top of the smartphone, where the plumes that connect the main board to the camera modules and flashes pass under the glass.
- 🌡️ Uniformity: Move the hair dryer around without lingering long at one point to avoid local overheating of the glass.
- 👐 Tactile control: Touch the body periodically with your finger (caution!) to assess the temperature - it should be palpably hot, but not scalding.
- 🛠️ Tool: Use multiple plastic cards, inserting them into already covered areas so that the glue does not grab back while you work elsewhere.
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If there is no construction dryer on hand, you can use a dense hot water package (about 80 degrees) by putting it on the back cover for 10-15 minutes, but it is less effective for corners.
Disconnection of plumes and removal of the main board
Once the glass is successfully separated from the frame, you will see the inside of the smartphone, but you can't rush to remove the board. At the top of the case, under the protective plastic bar, there are connectors connecting the main board to the daughter board (where the charging connector is located) and the camera modules. The first thing you need to do is turn off the battery to turn off the device and avoid short circuits when working with other components.
Carefully remove the plastic protective pad, twisting the screws that fix it, and get access to the plumes. To turn off the connectors, use a plastic blade or nail, putting the connector up from the bottom, in no case pull the wires or the plume film themselves, as they break. On the Xiaomi Redmi Note 5, the main camera plume and the display plume are located nearby, and they are easy to confuse or damage with careless movement.
| Component | Location. | Features of dismantling |
|---|---|---|
| Battery | The bottom, under the metal plate | First to disable, connector pressed from above |
| Main camera. | Top left corner (when viewed from behind) | Requires removal of the metal screen module |
| Display plume | Central part, wide connector | Fragile, you can not bend at a sharp angle |
| Antenna module | Sticked to the inside of the glass | Requires careful uncoupling from the lid |
Once all visible plumes are turned off, you can start to twist the screws that fix the main board, they are located around the perimeter of the board and can be hidden under stickers or protective screens. Remember or photograph the location of the screws, as they can have different lengths and threads, and placing a long screw in a short hole can damage the motherboard through.
What to do if the plume is broken?
Removal of the battery and replacement of components
The battery in Redmi Note 5 is glued to the frame of the case on double-sided tape, which makes it a task that requires care and effort. Under no circumstances do not try to tamper with the battery with a screwdriver or knife, as a puncture of the lithium-ion battery will cause it to ignite or explode. For safe extraction, use a special liquid to dissolve the glue (isopropyl alcohol) or heating method.
Apply a small amount of alcohol around the battery perimeter, trying not to pour liquid inside the case on the board, and wait a few minutes for the glue to soften. Then use a plastic card or a special fishing line to carefully "saw" the adhesive layer under the battery, gradually separating it from the body. Move the tool parallel to the plane of the case, avoiding sharp jerks that can deform the battery case.
If your goal was to replace the screen or repair other nodes, now is the time to do the necessary manipulations. Make sure that all new components are compatible with your board revision, as Xiaomi often makes design changes during production. When installing a new battery, make sure that its connector sat tightly in the connector and is fixed with a pin down bar.
- 🔋 Check: Before final assembly, check the voltage of the new battery with a multimeter, it should be within the limits of the 3.7-4.2 V.
- 🧹 Cleaning: While the body is disassembled, remove all old dust and glue residue from the frame so that the new glass or battery lays flat.
- 🧪 Degreasing: Wipe the frame with an alcohol napkin before applying new glue for better adhesion.
⚠️ Warning: If the battery is swelling, do not press it or pierce it. Remove it as carefully as possible using only plastic tools, and immediately dispose of it in a special container.
Assembly of the device and sealing of the housing
The assembly process is reversed to disassembly, but has its own nuances related to the restoration of tightness and aesthetics of the device. Before installing the back cover, you need to remove all the old adhesive layer from the frame of the case and from the lid itself, using alcohol and scraper. The surface must be perfectly clean and fat-free, otherwise the new glue will not be taken, and moisture and dust will enter the body.
To fix the lid, use a special electronics sealant (such as the B-7000 or T-7000) or a ready-made adhesive circuit cut out from the shape of the case. Apply a thin, uniform layer of glue onto the frame, avoiding the composition getting inside the camera or into the connectors, and let it dry for 1-2 minutes to a state of light stickiness. Carefully combine the lid with the body, starting from the top, and press tightly along the entire perimeter.
Once the lid is glued, it is recommended to lock the smartphone with stationery gums or place it under a small load for 1-2 hours to fully polymerize the glue. Do not turn the device on immediately, give time to all components to fall into place, and the glue to gain strength. Check all buttons, vibrator motor and cameras before considering the repair is completed.
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The quality of the lid gluing directly affects moisture protection (although it is difficult to achieve full water resistance at home) and the absence of backlashes of the body during operation.
Possible problems and solutions
Even following the instructions can cause unforeseen difficulties, typical for Xiaomi equipment repair. One of the common problems is detachment of the antenna module, which is glued to the inside of the glass. If this happens, carefully glue it back, using double-sided tape or a drop of glue, otherwise you may have problems receiving the signal Wi-Fi and cellular communication.
Another common situation is that the phone doesn't turn on after assembly. In this case, don't panic, but check the connection of the battery plume and the main display plume. Often the connectors do not fully snap the first time, and you need to reconnect with a characteristic click. Also make sure that the power button is not clamped with the case or the lid is not installed correctly.
If you notice gaps between the glass and the frame after assembly, it could mean that the remnants of the old glue interfere with the tight fit, or the lid was installed with a shift, in which case you will have to carefully warm the edges and reglue the lid, since using a smartphone with a loosely closed case will lead to a rapid accumulation of dust inside.