Xiaomi’s Redmi Note series has always been famous for its price-performance mix, and the 4-index model has become a real bestseller in the budget market. However, even the most reliable gadgets require intervention over time, whether it’s replacing a broken screen, recovering from moisture or replacing a battery that has lost its capacity.
Owners should be aware that the body is made of metal, which imposes certain limitations on opening methods. Unlike plastic counterparts, where you can use a thin knife or a credit card around the perimeter, it requires a special approach to heating and carefully detaching the plumes.
Before you start the action, you need to prepare the workplace and make sure that you have all the tools you need. Safety is the first rule of any repair, so work should be done on a clean, dry surface with good lighting. In this article, we will take a detailed look at each step, from the power out to the final assembly, so that you can perform the procedure as efficiently as possible.
Tools and workplace preparation required
Quality training is half the success of any repair work with mobile electronics. To open the Xiaomi Redmi Note 4, you will need a specific set of tools that will avoid scratches on the body and damage to internal boards. Using inappropriate items such as ordinary kitchen knives or stationery clips is strongly discouraged, as they can slip and damage important components.
The main tool for working with screws will be a set of precision screwdrivers, including cross bits of the sizes of the PH00 and PH000. These are the dimensions most often found in the design of Xiaomi smartphones.
Adhesives and plastic latches will require mediators or plastic blades. Metal tools are dangerous to use here, as there is a high risk of short circuit or damage to the plumes. In addition, prepare tweezers with thin curved ends to extract small screws and work in hard-to-reach places.
- 🔧 Precision screwdriver set (PH00, PH000)
- 🔥 Hair dryer or heating pad
- 🧲 Magnetic screw-sorting mat
- 📱 Plastic mediators and shoulder blades
☑️ Preparation for disassembly
Pay special attention to the organization of space. All small parts, such as screws and plugs, it is better to immediately fold into separate containers or on a magnetic mat, marking their origin, this will help to avoid confusion when reverse assembly, when screws of different lengths can be installed in the wrong holes, which can break the motherboard.
Primary safety measures and retrieval SIM-map
The first and most important step before any manipulation of the hardware of the smartphone is to completely shut down the device.Working with electronics under voltage can lead to irreversible consequences, including short circuit on the board or failure of the power controller.
The next step is to remove the tray for SIM-In the Redmi Note 4, the tray is on the top end of the case, and this uses a special clip that comes with the kit, or a thin screwdriver sting. Carefully press the hole next to the tray until the characteristic click and remove it.
⚠️ Warning: Never try to remove the tray SIM-cards while the device is on, as this may cause a software failure in the definition of the communication module.
After removing the tray, carefully examine the hole. There should be no dust or debris left inside, which could get deeper in further disassembly. If you are planning to replace the display or body, this is the stage at which you should check the condition of the tray sealing gum, as it is responsible for basic dust protection.
Now you need to heat the edges of the display. The glue that holds the screen to the frame softens under the influence of temperature, which allows you to separate modules without breaking the glass. Use a hair dryer at about 80-100 degrees, and evenly warm the perimeter of the screen for 2-3 minutes. Do not hold the hair dryer at one point for too long so as not to overheat the matrix.
Dismantling the back cover and removing the speaker frame
Unlike many modern smartphones, the Redmi Note 4 design involves accessing the main components through the removal of the rear metal cover. However, to get to the screws that fix this lid, you first need to dismantle the bottom plastic insert that covers the speaker, a critical point that is often missed by beginners.
Carefully heat the bottom of the case in the area of the speaker. Use a plastic blade to fit the edge of the plastic plug. It's held on adhesive and a few plastic latches. Move slowly, trying not to damage the plastic itself, as it can crack if handled carelessly.
Once the plug is removed, you'll see two screws that hold the main back cover, and you'll unscrew them using a PH00 size screwdriver. The screws can be quite tight because of the carving lock, so you'll need to force them confidently, but without jerking.
| Component | Type of screw | Number of | Location. |
|---|---|---|---|
| Stubbing the dynamics | No screws (glue) | 0 | Lower end |
| Back cover. | PH00 | 2 | |
| Payment dynamics | PH00 | 2 | Corners of the module |
| Basic fee | PH00 | 1 | Protective bar. |
When the screws are twisted, the back cover can be removed. It can also be glued around the perimeter, so use a suction cup or gently tuck the edge with a mediator. Don't pull the lid sharply, as it may have a fingerprint scanner plume attached to it (depending on the version of the device), which is easy to tear.
Nuances of the fingerprint scanner
Disconnection of plumes and removal of protective strips
When you successfully remove the back cover, you open up the inside of your smartphone, and the first thing you need to do is turn off the battery, which is the golden rule of mobile repair, which prevents accidental circuits and power surges when you disconnect other modules.
The battery connector in this model is located at the bottom, next to the charging connector. Carefully tuck the plastic connector with a plastic blade or a nail. Don't use metal tools to avoid damaging the contacts on the board. Once the battery is turned off, you can safely work with other components.
And then you take off the metal bar that covers the connectors of the display and the touchscreen, and it's mounted with one or two screws at the top of the body, and when you twist the screws, the bar is easily removed, and underneath it you'll see wide plumes coming from the screen.
- 🔋 Turn off the battery connector first
- 🖥️ Remove the metal protective bar
- 🔌 Disconnect the display and touchscreen plumes
- 📷 Turn off the main camera plume
Now you can disconnect the plumes of the display module, they are fixed by special latch plugs, lift the plug with a pint or a nail, and then carefully pull the plume up, the movements should be strictly vertical, without distortion.
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Before disconnecting any plume, take a picture of its position, which will help to properly set it back, especially if you are a beginner and may get confused in similar connectors.
If your goal is to replace the display completely, you can also disconnect the main camera plume at this point to have more freedom of movement. The camera is also based on adhesive and a fixing frame, so be careful.
Replacement of the battery and work with adhesive layers
The battery in the Redmi Note 4 takes up a significant portion of the internal volume and is attached to the body with a powerful double-sided tape.The glue dries over time, but most often the battery is very tight and requires heating to extract it. Don't try to pull the battery out by force using screwdrivers, as this can damage and ignite it.
Use a hair dryer again to warm up the back of the body in the battery area. The temperature should be palpable, but not melting plastic (about 60-70 degrees). After heating, insert a plastic card or a special spatula between the battery and the case and neat sawing movements, separate the cell.
⚠️ Warning: If the battery is swelling, be extremely careful. puncture or severe compression can cause the lithium electrolyte to ignite.
After removing the old battery, clear the seat of the old glue residue.Use isopropyl alcohol and soft fabric.The new battery should be installed on fresh bilateral tape, which usually comes complete with a new battery or bought separately.
When installing a new power supply, make sure the connector is properly positioned and not squeezed. Put tape on the contacts until final assembly to avoid accidental switching on. Only after installing all the components and checking the operation can the insulation be removed.
Assembly of the device and verification of functionality
It's done in reverse disassembly, starting with the display and touchscreen plumes attached to the motherboard, making sure they're plugged in and plugged in, then you put a metal bar in place and you twist the locking screws.
Put the battery on, and immediately check the reaction of the device. Press the power button. If the screen catches fire and the image appears, you're on the right track. Check the touchscreen by opening any application and swiping your finger across the screen. It's also worth checking the sound and the camera performance.
If all functions are working correctly, you can start installing the back cover. Apply a new adhesive B-7000 or use a pre-made adhesive layer around the perimeter of the frame. Press the lid and lock it with rubber bands for 15-20 minutes for primary polymerization of the adhesive.
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The main criterion for successful assembly is the absence of unnecessary screws after work and the stable operation of all phone modules without rebooting.
Don’t forget to install a plastic stub speaker and tray in place SIM-Once fully assembled, it is recommended that you do a stress test: take some photos, turn on the video, call someone, and make sure that no plume has been damaged during the assembly process.