Xiaomi Redmi 4X has earned a reputation as one of the most reliable budget devices of its time, but even the legendary “unkillability” has a limit. Sooner or later, any user faces the need to look inside the case: stopped charging the old battery, broke the protective glass or just accumulated dust to remove. At this point, the question arises how to open the Xiaomi 4X without damage and loss of warranty, although the latter by this point, most likely, has already expired.
The process of dismantling this model has its own unique features, which distinguish it from modern monoblocks with glass covers. Here you do not need to heat the back panel with a hair dryer or use suction cups to peel off glass. The Redmi 4X design is designed with repairability in mind, but requires accuracy when working with plastic latches and plumes. Understanding the internal architecture of the device is the first step to successful repairs that will bring the gadget back to life.
Before you start active, you need to prepare the workplace and tools. You will need a set of precision screwdrivers, a plastic spatula (mediator) and, preferably, a suction cup. Don't forget about safety: lithium polymer batteries can be dangerous if you carelessly handle, so avoid punctures of the battery body. In this article, we will discuss each stage of disassembly in detail so that you can perform the procedure as cleanly and professionally as possible.
Workplace preparation and necessary tools
The quality repairs begin long before you touch the first screw. The organization of the space is critical, because in the process of dismantling the Xiaomi Redmi 4X, you will find many small parts that are easy to lose or confuse. The ideal solution is to use a magnetic mat or a container with screw cells, which will allow you to not guess which bolt to twist when you reassemble.
To open the case, you will need a minimal but specific set of tools. The main tool will be a cross screwdriver size PH00 or PH000, as the screws in Xiaomi are traditionally small and tightly planted. Also, you can not do without a plastic card or mediator to snap latches; the use of metal objects is not recommended here, so as not to damage the glossy edges of the device.
☑️ Preparation for disassembly
An important stage of preparation is the extraction of the tray SIM-Many people forget this in a hurry and try to force the back cover to break down, which causes the internal mounts to break or damage to the plug itself, and make sure that the tray is fully removed before you start mechanically impacting the body. This is a simple but critical precaution.
Removal of the back cover and dismantling of the frame
Unlike the flagship models with an all-metal body or glass back, the Xiaomi 4X features a removable plastic cover. This greatly simplifies the initial stage of disassembly. You don't have to heat the edges or use chemical solvents. You just need to find a small ledge in the corner of the body and gently tuck the lid with a nail or plastic blade. The movements must be smooth so as not to break the plastic retainers around the perimeter.
Once you remove the lid, you'll see an internal metal frame that serves as the framework for all the components, and it's screwed to the main board and the bottom of the body with a lot of screws. Notice that the screws can have different lengths and threads. Systematize them immediately, laying them out in the order in which you unscrew them. Mistakes at this stage can cause the long screw to damage the motherboard when you build them.
To remove the metal frame, you need to twist all the visible screws around the perimeter and in the center. The number can vary depending on the revision of the board, but usually there are about 10-12 pieces. Once the fixture is removed, the frame will not remove itself - it is held on the latches. Carefully walk the mediator around the perimeter, cracking the locks. Be especially careful in the area of the volume buttons and on where the plumes are located.
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Use a magnetic mat or a piece of paper with your phone's drawing diagram to place the screws exactly where they're installed, which will save you hours of time when you build them.
Disabling plumes and removing the battery
The most important step, which requires maximum concentration, is working with electronic components. Before you completely remove the metal protection or remove the battery, you need to turn off the device. Find the battery connector on the motherboard and gently disconnect it. To do this, use a plastic blade, putting the connector on the bottom or side, but do not pull the wires, as they can break away from the battery itself.
After the power outage, you can start removing the battery. In the Redmi 4X, it is fixed with two strips of double-sided tape. To remove the battery without deforming the body, it is recommended to slightly warm the back of the body (if the lid is not already removed) or use special tools. However, since the lid is already removed, it is best to use a thin plastic card, sticking it under the battery and slowly separating it from the body.
⚠️ Warning: Never try to tamper with a metal screwdriver or knife.Puncture of a lithium battery will cause an instant ignition or explosion, which is dangerous to your health and property.
If the battery sits too tight, you can drop some alcohol or a special adhesive solvent (for example, the B-7000 is not suitable for softening, you need a glue cleaner) at the edges to ease the adhesion. After removing the old battery, be sure to clear the landing place of glue residue. Installation of the new battery requires applying a fresh layer of adhesive base for reliable fixation.
Replacement of the display and touch screen
Replacing the screen with Xiaomi 4X is a more difficult task, because the display module is integrated with the frame here. If you only have broken glass, and the image and touch work, theoretically you can only replace the glass, but at home this is almost impossible without special equipment (separator and laminator).
To replace the display, you have to completely dismantle the motherboard, which we'll discuss in the next section. Once you remove the "stuffing" from the old broken case, it is transferred to a new case with a pre-installed screen. When you connect the display plume, it is important to be careful: the connectors are very fragile. Push the plume until the characteristic click, making sure that it is up straight.
Often, users are faced with a situation when the new screen does not work after replacement or the touch screen “gluts”, this can be due to poor contact or defect of the spare part itself. Before the final assembly of the case, always conduct a functional test, simply by connecting the plumes, which will save time to redisassemble in the event of a malfunction.
How to check the quality of the new screen?
Dismantling of motherboard and bottom pallet
To access the charging connector or speaker, you need to remove the motherboard. It's attached to the top of the case. After turning off all the plumes (camera, display, buttons, antenna wires), the board is freed. Antenna wire (coaxial cable) often goes through the entire body and is attached with latches - snap it carefully without pulling sharply.
The bottom of the sub-board contains a Micro-USB charging connector, a main speaker and a microphone. This board is also screwed and connected to the main board by a plume. When you replace the charging connector, the entire bottom plume assembly is often changed, as soldering a new connector requires skills and a soldering station. For Xiaomi 4X, this is a common procedure, as the connectors are spread over time.
When you reverse-mount the motherboard, make sure it's properly seated in the rails. Incorrectly installed it can cause the contacts to close against the metal frame. Also check that all the screw struts match the holes in the board. Don't put too much effort into twisting the screws of the board to avoid squeezing the textolite.
| Component | Difficulty replacing | The necessary tool | Risk of damage |
|---|---|---|---|
| Battery | Low. | Scapula, hairdryer (optional) | Medium (puncture risk) |
| Display module | Tall. | Sets of screwdrivers, tweezers | Tall (many plumes) |
| Charging connector | Medium | Screwdrivers, soldering iron (if the connector is replaced) | Low (when replacing the plume) |
| Basic fee | Tall. | Complete toolkit | critical |
Device assembly and initial start
The Xiaomi Redmi 4X is assembled in reverse order, but requires even more care. The main task is to properly stack all the plumes so that they are not clamped down by a metal frame or body. A compressed plume can cause a broken microphone, buttons or touchscreen. Use tweezers to carefully stack thin conductors.
When you set up a metal frame, make sure that all screws are twisted evenly. Don't tighten one screw to the end, leaving others free. Write them diagonally, gradually increasing the force. This will ensure that the frame fits tightly without distortion, which is especially important for models with a plastic case, which can crack at point pressure.
Before you final install the back cover, you can start the first one. Connect the battery, press the power button. If the screen catches fire, the MIUI logo comes on, and the sensor is running, you're good. Only after a successful test can you finally snap the lid. If the device doesn't turn on, recheck the battery plume and the display.
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Successful assembly does not depend on the force of screw twisting, but on the correctness of the installation of internal components and the absence of unnecessary parts.