Xiaomi Redmi 4X has proven to be a reliable budget device, but even the most durable equipment over time requires the intervention of a wizard. Most often, users face the need to replace a broken display or a bloated battery. Self-disassembly can seem intimidating, but with a basic set of tools and accurate knowledge of the design of the case, this process becomes quite feasible at home.
Unlike the flagship models with glued casings, the Redmi 4X has a relatively friendly design for initial opening. However, there are hidden nuances, such as the location of the plumes and specific screws that are easily damaged if you carelessly handle, the right sequence of actions is the key to successful repair and maintenance of the device after assembly.
Before you start dismantling, you need to prepare the workplace, you need good lighting and a surface where fine details are not lost, and it's important to understand that any interference with the hardware of the device carries risks, so the fingerprint module in this model is connected by a separate plume, which requires special care when disconnected.
Tools and workplace preparation required
For high-quality disassembly Redmi 4X just screwdriver. Modern electronics require specialized tools that will avoid scratches on the body and damage to internal components. Standard set of home craftsman may not be suitable, as screws in Xiaomi often have a specific hat.
- 🔧 A set of precision screwdrivers, necessarily the presence of a bit PH00 or PH000.
- 🧲 Magnetic mat or organizer for sorting screws of different sizes.
- 💳 Plastic card or mediator for snapping the latches of the body.
- 🌡️ Hair dryer or heating pad for pre-warm-up (if the screen is broken and glued).
Special attention should be paid to the suction cup. If the display is intact but requires replacement due to matrix defects, the suction cup will help to gently lift the glass. If the glass is already broken, you can use a wide tape to hold the fragments together and create a flat surface for the tool to grip. Do not use metal blades for primary opening, there is a great risk of damaging the plumes running along the perimeter.
⚠️ Attention: Before starting work, be sure to turn off the device and remove SIM-Attempting to disassemble the switched-on smartphone can short-circuit and cause the power controller to fail.
Workspace organization is critical to success. Small screws tend to fly in different directions or fall into the crevices of the table. It's recommended to use a tray with sections or just a piece of paper that can mark the unscrewing steps on, which will save you hours of finding the right fixture when you reassemble.
Dismantling of the back cover and battery
The process of dismantling Xiaomi Redmi 4X begins with the removal of the rear panel. Unlike many modern monolithic smartphones, here the lid is held on plastic latches around the perimeter and several screws. This makes it easier to access the insides, but requires the right application of force to not break the locks.
First, you have to unscrew the two screws at the bottom of the back cover, on the sides of the charging socket, and then you take the suction cup, you attach it to the bottom third of the lid (closer to the logo, but not to the very edge), and you gently pull it up, while you insert the mediator into the gap.
We use a plastic tool to run the entire perimeter of the body, and the movements should be sliding, not stabbing. You'll hear the characteristic clicks, and that's the latches opening. Don't rush to pull the lid off abruptly, because it might have a fingerprint scanner plume glued to it, although it's more often displayed separately in the 4X, and it's easy to confuse the model.
Once you remove the lid, you'll have access to a battery pack, which is mounted on two screws covered by a decorative sticker or a plastic plug, and we unscrew them and carefully remove the battery by pulling a special tongue, if it's provided, or by putting a flat object on the edge.
Removal of the main board and disconnection of plumes
The next step is to dismantle the metal frame that protects the mainboard and other components. In the Redmi 4X, the board is secured by several screws and covered with a metal screen. Before removing the frame, you need to turn off all the plumes that go to the motherboard.
The first thing you do is you shut down the battery plume, which is a critical step to ensure that you keep it safe, and then you gently disconnect the plumes of the display and the touchscreen, and they can be pressed by metal plates that you want to bend or unscrew.
| Component | Type of attachment | Tool. | nuance |
|---|---|---|---|
| Back cover. | Latches + 2 screws | Mediator, screwdriver. | It doesn't have to be hot. |
| Battery | 2 screws under the plug | Screwdriver PH00 | Careful with the glue. |
| Basic fee | 6-8 screws + plumes | Setting screwdrivers | Remove metal protection |
| Display module | Perimeter glue | Fryer, sucker. | Requires heating to 80°C |
Once all the connectors are turned off, we unscrew the screws that hold the main board, and the number can vary, usually about six, and the board needs to be raised very carefully, to check if any antenna wire or button plume is caught, and the antenna cable often passes under the board or along the side edge.
⚠️ Note: Xiaomi display plumes are very thin and sensitive to clamps. Never pull the plume itself, just a thickened connector or a special puller, if any.
If your goal is to replace the board or repair the charging connector (which is soldered on a separate board in 4X, but connected by a plume to the main board), then at this stage the main unit can be removed.
Replacement of the display module and touch screen
The hardest part of repairing the Redmi 4X is working with the display, and the screen is glued to a metal frame (the middle part of the body) around the perimeter, it requires heating to remove it, the use of open flames is strictly prohibited, the best fit is a temperature-adjusted building hair dryer or a special heating pad.
Heat the front panel evenly around the perimeter for 2-3 minutes. The temperature should not exceed 80-90 degrees, so as not to damage the matrix (if it is still intact) or deform the plastic elements. After heating, try to gently tamper with the edge of the display with a thin blade or suction cup.
☑️ Pre-assembly check
We push a thin plastic blade or line between the display and the frame, cutting the adhesive layer. The movements should be smooth. If you feel strong resistance, add a little more heat. Sharp jerks will lead to cracks in the new glass or damage to the frame.
Once the old module is removed, we clean the frame of the glue residue, which can be done with isopropyl alcohol and soft fabric, apply a new layer of B-7000 glue to the low-fat surface, or use a pre-sticked two-story tape, and the new module is installed neatly, without distortion, and pressed with a load for 15-20 minutes.
What to do if there is an air bubble under the glass?
Working with the bottom plume and connectors
At the bottom of the Xiaomi Redmi 4X is a child board with a charging connector, microphone and antenna contact. It connects to the main board with a wide flexible plume that runs along the battery. Often charging problems are due to oxidation of the contacts of this plume or mechanical damage.
To replace the bottom plume or the board itself, you need to remove the battery completely (if not already) and unscrew the screws that lock the bottom of the case. The plume can be glued to the frame, so it also does not interfere with warming up. We disconnect the old plume from the connectors and carefully lay the new one, making sure that it lies flat, without clamps.
When installing a new charging plume, it is important to check the status of the micro-USB connector itself. In budget Xiaomi models, this is a weak point. Make sure that the "tongue" inside the connector is intact and does not hang. Also pay attention to the antenna contacts - they should be tightly pressed against the body or the response part when assembled.
⚠️ Warning: When you build, make sure that the display plume is not hit by the frame mount screws. This is a common error that leads to rubbing the plume and the appearance of stripes on the screen after a week of operation.
Device assembly and final inspection
The Redmi 4X is built in reverse order, but it requires a lot of care, so we first install and check the main components, without twisting all the screws to the end, plug in the battery, the display plume, and try to turn the device on.
If the phone is on, we check the touchscreen, the vibration, the speakers and the microphone, make sure the image on the screen is flat, without artifacts, and only after a successful test can we start to finally fix all the elements, twist the mainboard screws, install metal protection.
💡
Use a magnetic screwdriver at the final stage of the assembly, so as not to accidentally drop the screw inside the case, from where it will be extremely difficult to get without a complete disassembly.
We put the back cover on the top (where the camera is) and we slowly snap around the perimeter. We twist the two bottom screws last. Don't put too much effort into snapping -- if the lid doesn't get up, then some plume is wrong or the screw isn't twisted.
The final step is to clean the screen and the body of fingerprints and dust, turn on the phone and run a stress test: make a few calls, start the camera, check Wi-Fi and Bluetooth, and if all systems are stable, the repair can be considered successful.
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Quality assembly is not only the twisted screws, but also the correct position of all plumes that should not be stretched or clamped.