Xiaomi’s Redmi 4A series has proven to be a reliable budget device, but time takes its toll and any gadget can require repair. Most often, users are faced with the need to replace a failed battery or broken display module. Opening the case is the first and most important step of any repair, on which the success of the entire operation depends. Incorrect actions at the start can lead to damage to the plumes or break plastic latches.
Unlike many modern models, where the back cover is a non-removable part of the structure, the Redmi 4A manufacturer has provided the ability to access the insides, although this requires some care. The dismantling process does not require complex industrial equipment, but requires specialized tools and understanding of the physics of plastic joints. The key is to evenly distribute the force around the perimeter of the housing to avoid cracks on the front panel. In this article, we will discuss all the nuances of the procedure.
Before you start physically affecting the body of the device, you need to fully understand the risks and prepare the workplace. Haste is the main enemy, as the plastic becomes more fragile over time, and the glue that fixes the elements can behave unpredictable. Proper preparation will allow you to avoid common mistakes and maintain the aesthetic appearance of the smartphone after assembly.
Tools and workplace preparation required
To properly dismantle the back cover Xiaomi Redmi 4A will require a minimum, but specific set of tools. the use of improvised tools such as knives or pins, is strongly discouraged, as they can damage the internal components or scratch the body. Professional approach begins with the right tools that will ensure safety for both the master and the device.
First of all, you'll need a screen or body suction cup that allows you to create a vacuum grip with a smooth back surface, and an indispensable assistant is a mediator (plastic blade) or a thin metal scalpel with a blunted blade for neat snapping of the latches. Don't forget to prepare a hair dryer to heat the adhesive layer if it's present in the end area, and tweezers for working with small elements.
- 🛠️ Suction cup for lifting the back panel or display.
- 📱 Plastic mediator or blade for opening the body.
- 🔥 Hair dryer (construction or household) for softening glue.
- 🔧 A set of screwdrivers (usually a cross Phillips #00 or #0).
- 🧤 Antistatic gloves to protect electronics.
The organization of the workspace is no less important than the presence of tools. The surface of the table should be clean, flat and well-lit so that you can see the small parts and fasteners. It is recommended to use an antistatic mat that will prevent the accumulation of static electricity that can damage the sensitive electronics of the smartphone. All screws and small parts are better placed immediately in a magnetic tray or numbered containers.
⚠️ Warning: Before starting any work, be sure to turn off the device. Working with the battery under voltage can lead to a short circuit or fire.
If you have installed it in your device SIM-card or memory card, they also need to be removed before the start of disassembly. 4A It's located on one of the ends, and the forgotten map can be damaged by removing the lid or damage the tray itself. Make sure your hands don't have rings or bracelets that can accidentally touch the internal components.
☑️ Preparation for Redmi's autopsy 4A
Analysis of the structure and anchorage points of the shell
Understanding how your Xiaomi Redmi 4A is assembled is critical to successful dismantling, with the back cover made of plastic and attached to the main frame using a system of hidden plastic latches located around the perimeter of the device, which can be used in some modifications or after previous repairs, additional glue or double-sided tape, which complicates the opening process.
The main array of latches is located along the side faces and at the bottom of the smartphone. The upper part, where the camera and flash are located, also has fixing elements, but they are usually more fragile and require special care. The mechanical force should be applied not to the center of the lid, but to the edges where the fixation points are located. Trying to bend the lid from the center will lead to its deformation and the appearance of white clamps on the plastic.
And it's important to note that the Redmi 4A design doesn't involve screws to hold the back itself, but inside, under the lid, you'll have a lot of screws to hold the motherboard and the battery, so the primary challenge is to overcome the resistance of the latches without damaging them. The plastic that the body is made of has a certain elasticity, but at low temperatures or prolonged use, it becomes brittle.
| The hull area | Type of attachment | Difficulty autopsy | Risks. |
|---|---|---|---|
| Lower end (charge connector) | Tight latches + glue | Tall. | Dynamic damage |
| Side edges | Plastic clips | Medium | Latch break |
| Top part (camera) | Thin latches | Tall. | Cracks around the lens |
| Dynamic angle | Combined | Medium | Dynamic grid damage |
Visual examination of the ends before starting work can tell you whether the phone has been opened before, the presence of micro scratches around the junction of the lid and frame, blade marks or missing screws inside (which will be visible later) indicate an intervention. If the phone is on warranty, any autopsy trace will lead to its loss, so weigh the pros and cons.
The process of heating and separation of the back panel
The first physical action when opening the Redmi 4A cover, especially if it sits tightly, should be a neat warm-up of the perimeter. Using a hair dryer allows you to soften the possible adhesive layer and make the plastic more malleable. The heat should be evenly, leading a stream of hot air along all four sides at a distance of 3-5 cm from the surface for 1-2 minutes. The temperature should not be extremely high, so as not to damage the display matrix on the back side.
Once warmed up, the suction cup comes in, and you place it at the bottom of the back cover, closer to the center, but not too close to the edge to ensure a secure grip. Pull the suction cup upwards, creating a gap between the lid and the frame. Once there is a minimum gap (literally a millimeter), you need to immediately insert a thin mediator or scalpel blade, fixing the gap.
- 🌡️ Heat the perimeter evenly without holding the hair dryer at one point.
- 👐 Use a suction cup to create an initial gap at the bottom of the case.
- 🔪 Enter the mediator into the resulting gap and lead along the edges.
- 👂 Listen to clicks – they signal the snapping of the fixers.
Move the tool smoothly, without jerking, following the circuit of the smartphone. Your goal is to consistently release the latches. Once you reach the corners, exercise the utmost caution: this is where the mounts most often break. If the lid does not lend itself, do not use force - you better add a little more heat. Patience in this process is the main tool of the master.
⚠️ Warning: Do not insert a metal tool too deep inside the case.You may damage the plumes connecting the buttons or the main board that may pass close to the edges.
When all the latches on the sides have been passed, the lid can still hold on to the top. Carefully bend the bottom of the lid upwards, but don't disconnect it completely until you make sure there are no plumes inside connecting the lid to the main board. In the Redmi 4A model, nothing is usually installed on the lid itself, but in other versions there may be a fingerprint scanner or antenna module.
What to do if the lid is cracked?
Disconnecting plumes and access to internal components
After successfully removing the back cover, you will see the internal device Xiaomi Redmi 4A. However, this is not the final disassembly. Before you completely remove the lid to the side and start to twist the screws, you need to visually assess the situation. In this model, the rear cover has no own plumes, which greatly simplifies the task, but requires attention to other elements.
The next step is usually to dismantle the metal safety plate that covers the plugs of the display and touchscreen, and the battery connector, and this plate is mounted with several screws of different sizes. It's important to remember the location of each screw, because they can vary in length.
Use a dielectric blade or plastic tool to turn off the battery plume. This is a mandatory procedure that must be performed first to turn off the device. Only after the battery is turned off can you safely work with other connectors: display, touchscreen, button plumes and cameras. Metal tools are better not to touch the connectors, so as not to damage the contacts.
- 🔋 First thing you do is turn off the battery plume from the motherboard.
- 🔩 Unscrew all the screws of the protective metal plate.
- 📱 Carefully disconnect the plumes of the display and touch screen.
- 📸 Don’t forget to turn off the main and front camera plumes.
If your goal was only to replace the battery, then after removing the protective plate and turning off the battery plume, you can start removing the battery itself. The battery in Redmi 4A can be glued to the body, so it may also require light heating and the use of a suction cup or plastic card for tatting.
💡
Use isopropyl alcohol to dissolve the glue under the battery. Drop a few drops around the battery perimeter and wait a few minutes, which will make it much easier to extract.
Typical autopsy errors and their consequences
Even experienced craftsmen sometimes make mistakes, let alone beginners who are first-timers to repair the Xiaomi Redmi 4A. One of the most common mistakes is ignoring the heating of the case. Trying to tear the "cold" cover by force is almost guaranteed to break the plastic latches. It is difficult to restore them, and as a result the cover will hold slim, and dust will enter the case.
Another critical mistake is using excessive force to snap, and if the tool is stuck or the lid is not going, you either didn't warm up the glue or you missed one of the latches, and if you push harder, you risk splitting the back panel itself, or worse, damaging the frame to which the display is attached, and replacing the frame is already a complex and expensive repair, comparable in cost to half a phone.
Forgetfulness about screws is a classic of the genre. Often users forget to unscrew one hidden screw hidden under a sticker or in the depth of the hole and try to remove the board by force. This leads to a break in the tracks on the board or break the mounting racks. Always check if all the screws are removed before applying force to separate the parts.
⚠️ Warning: Never try to lid the display side, which will cause chips on the glass or stains on the matrix that cannot be removed.
Also worth mentioning is the misconnection of plumes. Display and touchscreen plumes are not always interchangeable and have different stitches. Trying to connect them in the wrong connector or upside down (if the design allows for physical connection) can burn the power controller or backlight. Be careful about the marking and shape of the connectors.
💡
The secret to success is to take your time, and every second spent inspecting and preparing saves hours on finding parts to replace broken parts.
Assembly of the device and verification of functionality
The Redmi 4A build process is reversed, but it also requires care. Start by connecting the plumes: first the battery, then the display, touchscreen and cameras. Make sure each connector is up to the characteristic click and lay flat. After that, install a metal protective plate and twist all the screws, respecting their original length and location.
Before you snap the back cover, be sure to test the device, plug the battery and press the power button. If the phone is on, check the touchscreen (through all areas of the screen), the speaker, microphone, vibrator and cameras. Also check the proximity and light sensors by covering the top of the screen with your hand during the call.
If all functions are working correctly, you can proceed to the final installation of the lid. Match the top of the lid with the body, then gently press the perimeter until the latches click. Move from center to edges, spreading the pressure evenly. Make sure there are no gaps anywhere, and the lid sits tightly around the perimeter.
- 🔌 Check the operation of all modules before the final assembly.
- 🔩 Twisting the protective plate screws in the correct order.
- 🔘 Combine the top of the cover with the body first.
- 👆 Press the perimeter to the characteristic snaps of latches.
Once built, you can wipe the screen and body from fingerprints and dust. Turn on the phone again and make sure you don't damage anything or forget to plug in during the build. If the phone is stable, you can consider the repair successfully completed. A properly executed replacement or cleaning will extend the life of your Xiaomi for several more years.