Smartphones of the Redmi line from Xiaomi have long proven themselves as reliable devices with a metal body, but even the most durable gadgets are susceptible to breakdowns. Most often, owners of the Redmi 4 Pro model, also known as the Redmi Prime in some regions, face the need to replace a broken display or worn-out battery. Self-disassembly of this device requires accuracy, since the design involves the use of hidden screws and plumes, which are easily damaged if handled carelessly.
Before you start dismantling, you need to understand that the process requires a set of tools and minimal electronics skills. Wrong actions can damage plumes, cracks in the glass or even failure of the motherboard. In this article, we will look at each step in detail, from the preparation of the workplace to the final assembly, so that you can safely perform repairs at home.
It is important to note that the Redmi 4 Pro has an all-metal body with antenna inserts, which makes the process of opening it a little more difficult compared to plastic counterparts. You will need patience and care, especially when working with adhesive joints and fragile connectors. By following this instruction, you minimize the risks and can successfully replace damaged components.
Tools and workplace preparation required
To work with Xiaomi Redmi 4 Pro, you will need a specialized set that will avoid scratches on the body and damage to internal components. The use of inappropriate items such as kitchen knives or thick screwdrivers is strongly discouraged, as this can lead to irreversible consequences.
The basis of your kit should be a set of screwdrivers with various nozzles, including cross (PH00, PH000) and possibly Torx, although this model is more often used standard screws. Also indispensable tool is a plastic blade or mediator for gently snapping clips and separating the display from the frame. Metal tools should be used with extreme caution, so as not to close contacts on the board.
- 🛠️ A set of precision screwdrivers (mandatory size availability) PH000).
- 📱 Plastic blades and mediators for opening the body.
- 🔥 A hair dryer or thermophene to soften the glue under the screen.
- 🧲 Magnetic mat or organizer for sorting screws.
- 🧤 Antistatic gloves and tweezers for working with small details.
Prepare the workspace: it should be well lit and have a hard, flat surface. Cover the desk with a soft cloth or silicone mat so that the fallen screws don't get lost and the smartphone parts don't get scratched. Make sure you have free space in advance to accommodate the dismantled parts in the order they are removed.
☑️ Preparation for the dismantling of Redmi 4 Pro
Primary Actions: Shutdown and Removal SIM-map
The first and most important step before any electronics manipulation is to shut down the device completely. Don't ignore this step, as trying to disconnect the plumes or battery when power is on can short-circuit and cause the power controller to fail.
After the shutdown, the tray must be removed for SIM-In the Redmi 4 Pro, the tray is hybrid, so it's important not to confuse the orientation of the cards when you build them. Use a special paper clip or a thin needle to press the hidden mechanism in the hole at the end of the case.
⚠️ Warning: Never try to remove the tray SIM-cards while the device is on, especially if you plan to work with a file system or memory, although in this case it is about the physical security of the slot.
Check the perimeter of the device for visible screws. In the Redmi 4 Pro, there are no main screws in visible places, they are hidden under decorative plugs or located under other elements, which requires careful study of the structure before unscrewing. The absence of visible screws on the faces indicates that the main fastener is under the display module or hidden by plugs.
💡
Before you unscrew the screws, take a close-up picture of the device, which will help you remember exactly where the plugs and screws were, if you are doing this for the first time.
Removal of the back cover and removal of fasteners
Unlike many modern smartphones, the Redmi 4 Pro has a design where access to the main components is opened through the removal of the display module, but first you need to free the perimeter. However, the classic disassembly scheme of this model involves working through the front panel, since the rear cover is not removed separately without damage.
Carefully inspect the bottom end of the device next to the charging connector. There may be screws hidden in the depths of ports or under rubber plugs. In some Xiaomi revisions, two screws are located on the sides of the Micro-USB connector. Use a thin screwdriver to unscrew them, trying not to tear the thread and not to damage the metal edge of the connector.
After removing all visible screws, you need to separate the display module from the metal frame of the case. This will require heating. Carefully warm the screen perimeter with a hairdryer to a temperature of about 60-70 degrees Celsius. Do not hold the hairdryer too long in one point so as not to damage the matrix or the adhesive layer. Heat will soften the glue that holds the glass.
| Component | Type of attachment | Tool. | Risk of damage |
|---|---|---|---|
| Display module | Glue + frame | Fryer, sucker. | Tall (glass crack) |
| Screws of the frame | PH000 screws | Screwdriver. | Low (to tear the thread) |
| plumes | Connector latches | Plastic spatula | Medium (steer break) |
| Battery | Adhesive tape | Plastic card | High (battery puncture) |
Use a suction cup to create a gap between the glass and the frame, and insert a plastic blade. Drive the tool along the perimeter, gradually peeling off the module. Act slowly, feeling the resistance of the glue. If you feel that part is not coming, add a little more heat, but do not use excessive force.
Disabling the plumes and removing the display module
Once the display module is separated from the body around the perimeter, don't try to remove it completely right away. It's connected to the motherboard by several plumes. Carefully bend the screen like a page of a book to access the bottom of the board. Here are the display connectors and the touchscreen.
To turn off the plumes, use a plastic blade or nail. Connectors in Xiaomi are usually spring-loaded or have an upper latch. In a light upward movement, pull the connector away from the board. Don't pull the plume itself, only act on the hard part of the connector. The mistake is to pull on the soft part of the cable, which will lead to its break.
- 🔌 Display plume (wide, usually at the top or bottom of the connector).
- 👆 Touchscreen plume (digitizer), often located next to the display.
- 📷 The tail of the front camera and sensors (if it does not come in the assembly with a frame).
- 🔋 Home button plume (in this model, the button can be part of a charging plume or a separate one).
Once you've shut down all the connections, you can take the display module completely off, put it in a safe place with the screen up so you don't scratch the matrix, and now you have access to a metal screen that covers the motherboard and the battery, and this screen is also screwed around the perimeter.
What to do if the plume does not unfasten?
Access to battery and motherboard
Under the metal screen, you have the motherboard and the battery, and you have to unscrew all the screws that hold the safety plate to access them, and you have to place the screws that you've twisted in the same order that you took them off, because they can be of different lengths, and the entanglement will damage the board when you build them.
The battery in the Redmi 4 Pro is glued to the body with double-sided tape. You can't use metal objects to remove it. You can slap the edge of the battery with a plastic card or a special spatula. You can move slowly, try not to deform the battery itself. If the battery is swelling, be especially careful not to damage the shell.
⚠️ Attention: A puncture of a lithium-ion battery can cause a fire or a chemical burn.If you notice bloating, don't press the battery and work with gloves.
The motherboard is not only screwed, but also held on the plumes below (buttons, charging) and above (cameras, sensors). Before fully removing the board, make sure that all connections, including antenna contacts, are disabled if they are output separately. Antenna cable often runs along the side face and can be secured with clips.
Replacement of the charging connector and assembly of the device
A common problem is the breakdown of the bottom plume with the Micro-USB charging connector. To replace it, you need to unscrew the board that holds the connector, or replace the entire plume assembled with the speakers, since in this model they are often combined. Unscrew the screws that fix the connector board and gently disconnect it from the main plume.
The assembly is done in reverse order. Install the new part, fix the screws and connect the plume to the motherboard. Before the final twist of all screws and glue the screen, it is recommended to perform a test turn on. Connect the battery and press the on button to make sure that the phone responds, charging and touchscreen.
If everything is working correctly, degrease the frame with alcohol or a special cleaner to remove the residue of old glue. Apply a new B-7000 glue or use a special adhesive tape for displays. Press the screen against the body and lock with gums for 15-20 minutes before the initial grasp of the glue.
💡
The quality of the glue and the purity of the surface is the guarantee that the smartphone will not get dust, and the screen will not peel off after a month of use.