Smartphone Xiaomi Mi Note 4, known in the global market as Redmi Note 4X, has proven to be a reliable device, but time spares electronics. Sooner or later, the owner faces the question of replacing failed components, whether it is a broken screen, worn-out battery or broken charging connector. Self-disassembly of the case allows you to save significant money on the services of the service center, if you approach the case with due care.
It's important to understand that opening a gadget is a delicate process that requires care and the right tool, and that there are fragile plumes and tightly attached connectors inside the device, which can cause individual modules to fail, but by following a proven technique and following safety practices, even a beginner can successfully dismantle the main nodes.
In this guide, we will look at every step of the way, from the workplace to the final assembly, and learn about the hidden nuances of the design, such as the location of screws under the stickers and the features of turning off the plumes. Process readiness and the availability of basic knowledge significantly reduce the risk of errors.
Tools and workplace preparation
Before starting the dismantling, you need to organize the space. The surface of the table should be clean, flat and, preferably, light so that small screws do not get lost. The ideal solution would be to use a magnetic mat or special organizers for screws, since the Xiaomi Mi Note 4 design uses fasteners of different lengths.
You'll need a minimal but high-quality toolkit to work with, and the main tool will be a precision screwdriver suite that includes the PH000 and PH00 cross nozzles, and plastic shoulder blades (mediators), a thin metal spatula to separate the frame, and a suction cup to remove the back cover neatly.
- 🔧 Set of screwdrivers with magnetic nozzles of different sizes.
- 🛠️ Plastic mediators and metal blade for opening.
- 💨 Suction cup for safe lifting of back panel.
- 🔦 Powerful light source or magnifier for inspection of small details.
Special attention should be paid to the organization of lighting. Shadows can hide important details, such as microscopic cracks in the plumes or the position of the latches. Good visibility is the key to successful repairs, avoiding accidental damage to internal components when you move carelessly.
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Use a magnetic mat or a piece of paper with painted cells to lay out the screws in order of their extraction, which will help you not confuse the long and short screws when you build them.
Initial stages of dismantling the hull
The process begins with the removal of the tray for SIM-This is a critical step, because trying to remove the back cover with the tray installed is guaranteed to break or damage the case. Use a special clip or a thin needle to press on the opening of the mechanism.
Then you have to remove the two screws that are at the bottom of the device on the sides of the Micro-USB connector. They lock the bottom of the frame to the main structure. After they are twisted, you can start to separate the rear panel, which is held on plastic latches around the perimeter.
⚠️ Warning: Don't try to plug the back cover on the side of the volume and turn on buttons. This area has a fingerprint scanner plume that will damage if you open it sloppy. Start disconnecting from the bottom corner or the long edge.
Using a suction cup, create a small gap between the screen and the back cover at the bottom. Insert a plastic mediator into the resulting slit and, as you slid along the perimeter, snap the locks. Use the metal blade with extreme caution to avoid leaving scratches on the aluminum frame.
Once the back cover is removed, you will be able to access the insides, immediately disconnect the battery if the design allows you to do so without removing the additional protective plates, or be extremely careful when you continue to manipulate it so as not to close contacts. De-energize the device is the main safety rule when working with electronics.
Removal of metal frame and access to board
The main board Xiaomi Mi Note 4 is closed with a massive metal frame, which also acts as a radiator. To remove it, you need to twist many screws around the perimeter. Note that some of them can be hidden under small stickers or rubber plugs.
At the bottom of the device is a control board that is approached by antenna cables, which must be carefully disconnected by putting on the connectors with a nail or a plastic blade, and antenna wires are very thin and require careful handling, as they can be difficult to reconnect if the contact area is damaged.
☑️ Checking before removing the framework
Once all screws are removed, the frame will not be removed immediately, as it is integrated with the buttons. You need to carefully lift it, controlling the position of the volume and on buttons so that they exit their holes in the case. Often, light swaying from side to side is required.
And underneath the frame, you'll see the main motherboard, closed by another metal screen, and you'll need to unscrew the screws that hold this protective casing to access the connectors of the display and the battery, and only after it's removed can the plumes be safely turned off.
Replacement of the display and touch screen
The display module in the Redmi Note 4X is glued to a plastic midframe. If you change only the glass or the display itself without changing the frame assembly, you will need heating. Use a thermophen or heating pad to soften the adhesive holding the screen. The temperature should not exceed 80-90 ° C, so as not to damage the matrix.
The process of disabling the old display begins with the removal of the protective metal plate above the connectors. After disconnecting the plume, the battery can be removed completely, if necessary for convenience, by previously unstuck it from the housing.
| Component | Type of attachment | Difficulty replacing | Risk of damage |
|---|---|---|---|
| Back cover. | Latchers | Low. | Medium (scanner plume) |
| Battery | Adhesive tape | Medium | High (puncture) |
| Display. | Glue + frame | Tall. | Very high (cracks) |
| Payment | Screws + plumes | Medium | Medium (connectors) |
When installing a new display, make sure that the plume is stacked smoothly, without cracks. The connector should snap with a characteristic, barely audible klik. Before the final assembly, it is recommended to conduct a test turn on, attaching a plume to the board to make sure that the touchscreen and matrix are working.
What to do if the new screen is not working?
Dismantling of battery and connectors
The battery in Xiaomi Mi Note 4 is planted on double-sided tape. You can't use metal tools to extract it, which can pierce the shell and cause fire. The best method is to use a thin line or plastic card dipped in isopropyl alcohol.
Ride a line under the battery from one end and smoothly cut the glue throughout the area. Periodically add alcohol to dissolve the adhesive. Do not put excessive effort and do not bend the battery, as this can lead to an internal short circuit.
⚠️ Warning: It is strictly forbidden to puncture or deform a lithium polymer battery. If smoke or characteristic hiss appears, immediately stop work, take the device outdoors and fill it with sand or place it in a container of water.
The Micro-USB charging connector is soldered on the bottom board, and it requires the complete dismantling of all components, including the battery and the main board, since the bottom board is at the bottom of the design, and it's one of the most time-consuming operations in this device.
When installing a new battery, be sure to use a special glue or quality double-sided tape for fixation. The battery dangling inside the case can damage the plumes or cause short circuits when vibrating. Reliable fixation is important for the longevity of repairs.
Assembly of the device and verification of functionality
The assembly is done in reverse order, but requires increased attention to detail.Make sure all screws are returned to their places, especially those that fasten the motherboard, as their absence can lead to poor antenna contact or closure.
Before you close the back cover, check all the functions: sound, vibration, cameras, Wi-Fi and cellular. SIM-If everything works correctly, you can apply glue to lock the back panel or just snap it if the design allows.
- 📱 Check the touchscreen across the entire screen area.
- 🔊 Make sure there is no noise in the dynamics.
- 📸 Take a test shot on the front and main camera.
- 🔋 Monitor the charging process of the device.
The final step is to clean the case of fingerprints and dust. Use microfiber and special screen cleaner. Properly assembled Xiaomi Mi Note 4 should work as new, delighting the owner for a long time.
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The build quality directly affects the waterproofness and durability of the device. Don't be lazy to check each plume before closing the case.