The Xiaomi Mi 4X, released in 2016, has proven to be a reliable budget device with a metal body. However, time does not spare even the best equipment, and owners often face the need to replace failed components, such as a discharged battery or broken glass display. The process of disassembling this device requires accuracy and understanding of the design, as it is not without typical Xiaomi build features.
Before you start taking action, you need to realize that opening the case automatically deprives you of an official warranty if it was still in effect. Successful dismantling requires not only a set of tools, but also patience to avoid damaging the plumes and plastic latches. In this article, we will look at each step in detail, from the preparation of the workplace to the final assembly of the device.
It's important to note that the Redmi 4X (as it's often called in different regions) has a classic layout where the main board is located under the protective screen and the battery takes up a significant portion of the interior space. Understanding this geometry will help you avoid the ridiculous mistakes when the user tries to tamper with the wrong part.
Tools and workplace preparation required
You can't do a good job of disassembling without the right tools. Using tools at hand, like kitchen knives or thick needles, often damages the case or, worse, shorts the circuit board, and you'll need a customized kit that you can buy from any radio parts store or order online.
First of all, get a set of screwdrivers, where there are PH000 and PH00 bits. This is the size used in the screws of the board and modules in the Xiaomi Mi 4X. Also (indispensable) will be a plastic shovel (mediator) for snapping the case, a metal blade with a thin sting for the primary opening and a suction cup for neatly lifting the screen.
☑️ Disassembly tools
Don't forget to prepare the screw container so you don't lose it in the process. Small parts tend to fly around the table and fall into the crevices. The organization of space is the guarantee that you will have extra parts after assembly.
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Use a magnetic mat or a sheet of white paper that you can schematically draw the location of the screws, which will greatly simplify the assembly and help not to confuse the fasteners of different lengths.
Primary opening of the body and removal of the back cover
Xiaomi Mi Device 4X It has an all-metal body, but the insides are accessed through the front panel, not through the back cover, like many modern smartphones with glass backs. This is an important nuance that often confuses beginners. SIM-cards so as not to damage it when skewed the body.
First, you need to heat the perimeter of the screen. The glue that holds the display module to the frame softens when heated. Use a thermophen or heating pad, setting the temperature at about 80-90 degrees Celsius. You should warm for 2-3 minutes, constantly checking the temperature with your hand so that the matrix does not overheat.
⚠️ Note: Do not exceed the heating temperature of 100 degrees, otherwise the polymer frame of the display may deform, and the glue will turn black, which will complicate further cleaning.
After warming up, insert a suction cup at the bottom of the screen, closer to the Home button (or logo if the touch button is), pull the suction cup upwards, creating a small gap, and immediately insert a thin plastic card or mediator blade into it.
- 🔥 Heat the screen evenly, moving the hair dryer around the circle.
- 🛠️ Enter the mediator no deeper. 3-4 mm, so you don't hurt the plumes.
- 🧩 Click the body around the perimeter, starting from the bottom.
Dismantling of protective metal plate
Once the display module is successfully separated from the frame, you will see the internal contents covered by a metal plate, which protects the main components from mechanical stress and shields radio signals. In the Xiaomi Mi 4X, it is attached to many screws of different calibers.
If you take a close look at the board, you'll see the screws marked with special warranty seal stickers, and if you break them, the device loses its warranty, but it doesn't matter for repair, and you'll see the screws around the plume connectors and around the board.
Use a magnetic screwdriver to unscrew the screws, as they are very small and easily lost. Pay special attention to the screws in the corners of the board and the connectors that attach. After removing all the fastening elements, gently slap the plate with the mediator and remove it.
Secret screws under stickers
Under the plate, you'll see the main nodes: the battery, the motherboard, the bottom board with the charging socket and the main camera module. Now access to key components is open, but you shouldn't rush to retrieve them.
Disabling the plumes and retrieving the battery
The most critical step is to turn off the plumes. In the Redmi 4X, they are quite tightly positioned. The first thing to do is to turn off the battery plume to turn off the device, a critical electrical safety measure that prevents short circuits from accidentally touching the board with a tool.
The display and touchscreen plumes are usually at the top of the board, closer to the front camera. Use a plastic blade or nail to turn them off. Push the connector upwards from the bottom, avoiding pressure on the connector itself. Metal tools are highly undesirable here because of the risk of damaging the contacts.
| Component | Location. | Type of attachment | Features |
|---|---|---|---|
| Battery | Center of the hull | Glue strip + connector | Requires heating to remove |
| Display. | Front part | Perimeter glue | Fragile, afraid of pressure |
| Maternity fee | Upper part | Screws + plumes | Many small screws |
| Main camera. | Corner of fees | Bustle + plume | Exceeds above the pay level |
Removing the battery in the Xiaomi Mi 4X often requires heating the back of the body, as it is glued to a metal frame. Carefully warm up the battery area and use a plastic card to tamper with it. Do not use sharp objects to avoid piercing the lithium polymer cell.
⚠️ Warning: If the battery is swelling, be very careful. A puncture of the swelling battery can cause a fire.
Replacement of the display module and assembly
If the purpose of disassembly was to replace the screen, after turning off the plumes, the old module can be completely removed. Before installing a new display module, you must carefully clean the frame of the residue of the old glue.
The new screen usually comes with an already applied adhesive layer (B-7000 or analogue). Remove the protective film and carefully align the module with the frame. Press the perimeter for fixation. Make sure the plumes are stacked correctly and not clamped with a metal plate.
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Qualitative cleaning of the frame from the old glue is a guarantee that the new screen will lie flat and will not peel off during operation.
The assembly is done in reverse order. First, you put a metal plate in and you twist all the screws, then you plug in the display plumes and the touchscreen, and then you plug in the battery at the very end, and then you can put the new glue on and you can press the screen against the body.
Use special screed gums or loads to fix the case, leaving the device to dry for 1-2 hours, which will provide a reliable fit and protection against dust. Don't turn on the phone right away, let the glue grab.
Frequent problems and troubleshooting
During the repair process, users often face a number of typical problems, such as when the phone is built, it may not see. SIM-This is often due to poor contact of the lower board or damage to the antenna plume during disassembly.
Another common problem is the touchscreen dead zones, which could indicate damage to the plume when it was taken off carelessly, or poor quality of the part itself, and it's also possible that the screws of the metal plate were twisted too hard and pushed through the board, disrupting the contacts.
- 📱 The screen does not light up: check the density of the connector landing.
- 🔋 The phone is not charging: check the connector USB pollution-proof.
- 📡 Bad signal: Make sure the antenna contact is pinned by a screw.
If you are faced with a situation where the phone goes into an endless reboot after changing the screen, it may be a problem in the incompatibility of the spare part or damage to the power controller.
⚠️ Warning: Using unoriginal low-quality screens can lead to increased power consumption and quick battery discharge, even if the battery itself is in good working order.