The process of dismantling the Xiaomi Redmi 4 Pro smartphone, which in the global version is known as the Redmi Note 4, requires the wizard to limit concentration and the presence of a specialized tool. Disassembly of the device does not belong to the category of simple procedures, since the design of the device involves the use of a large number of screws and a reliable adhesive connection of components. Incorrect actions at the initial stage can lead to damage to the plumes or chips of the glass rear panel, which will make further repairs economically inexpedient.
The main difficulty is that Xiaomi's strategy of maximum sealing, hiding fasteners under decorative plugs and layers of glue. Before you start to physically affect the body, you need to completely de-energize the gadget and prepare the working surface.
In this guide, we will take a detailed look at each step required to safely open the case, learn what tools you will need, how to disconnect fragile connectors, and what to look for to get the machine back in working order, and learn how to organize the process properly and avoid typical errors.
Tools and workplace preparation required
The use of improvised tools such as knives or pins is strongly discouraged, as there is a high risk of damage to internal components or injury. You will need a set of precision screwdrivers, including cross bits of size PH000 and PH00, as well as a flat screwdriver for working with latches.
You'll need a heat source to work with adhesives. Professionals use a thermostole, but at home, you'll need a temperature-adjusted building hair dryer or even a powerful household hair dryer, although the latter is less efficient. Also, prepare plastic mediators, a screen suction cup and curved-end tweezers for hard-to-reach areas.
Space organization is key. All screws should be laid out in order of their extraction, preferably on a magnetic mat or in the cells of the organizer with signatures. Xiaomi smartphone contains screws of different lengths, and mounting a long screw in the hole for a short can penetrate the motherboard through, disabling the device.
- 🛠️ A set of screwdrivers with magnetic tips for reliable capture of small fasteners.
- 🔥 Thermostole or hair dryer to soften glue under the back cover and battery.
- 💳 Plastic cards or mediators for safe opening of the case without scratches.
- 🧪 Isopropyl alcohol or special solvent B-7000 glue-worker.
⚠️ Warning: Before starting any work, be sure to discharge the battery of the device below 25%.Working with a fully charged Li-Ion battery during heating and physical exposure carries the risk of fire or bloating.
Make sure the lighting in the work area is bright enough and the table surface is clean and does not conduct static electricity. Using an antistatic mat and bracelet will be an excellent prevention to protect electronics from hidden damage.
Dismantling SIM-tray and back panel
The first step in the algorithm describing how to open the Xiaomi Redmi 4 Pro is to extract the tray for the first time. SIM-This should be done before heating, so that the plastic elements inside the case are not damaged. Use a special paper clip or a thin point, pressing the tray into the hole, and carefully pull it out.
Once the tray is removed, inspect the perimeter of the device. In some versions, additional screws may be hiding under or near the tray, fixing the frame. However, in most cases, the Redmi Note 4 does not have external screws on the back cover, and it is held exclusively on adhesive-based and internal latches.
To peel off the back panel, warm the perimeter of the device evenly. The temperature should not exceed 80-90 degrees Celsius, so as not to damage the display on the back side or plastic frame elements. Keep the heat source at a distance of 3-5 cm, constantly moving it along the faces for 2-3 minutes.
When the body is warm enough, use a suction cup to create a gap between the back cover and the frame. Insert a plastic mediator into the resulting gap and, without removing it, swipe around the perimeter, gradually snapping the locks. The movements should be sliding, not stabbing.
Removing the protective screen and access to the insides
When you successfully remove the back cover, you'll see the motherboard's internal metal protection, and unlike many modern smartphones, there's no additional layer of NFC or wireless charging, which makes it a little bit easier, but there are a lot of screws hiding under the metal screen.
You're going to have to unscrew all the visible screws that are fixing the metal plate, and the number of screws can vary depending on the regional version of the device, but they're usually around. 10-12 Don't forget to check the areas near the cameras and connectors.
The metal screen is often glued to the edges. Walk carefully around the perimeter, separating the metal from the plastic frame. Once the protection is removed, access to the main modules: the motherboard, the display plumes and the battery connector is opened.
- 🔋 First, disconnect the battery plume to completely de-energize the circuit.
- 📱 Carefully disable the plumes of the display and touch screen, tucking them with a plastic spatula.
- 📷 Remove the main and front camera modules if you need to replace them.
- 🔊 Disconnect the tail of the lower module (microphone/charging port for complete separation of parts.
Now the motherboard is fixed only to screws and plumes. Carefully remove the board, trying not to touch the sockets of the volume buttons and ons, which can be soldered on the side edge or connected by a plume.
⚠️ Note: The plumes in the Xiaomi Redmi 4 Pro are very thin and delicate. Never pull them by the conductor itself - always take only a hard plastic connector.
Removal of the battery and replacement of components
The most time-consuming step when you decide to open the Xiaomi Redmi 4 Pro to replace the battery is to dismantle the battery itself.It occupies almost the entire bottom of the case and is glued with powerful double-sided tape.
To safely extract, reheat the bottom of the device where the battery is located. The temperature should be comfortable to hold the device in your hand, but sufficient to soften the glue. Use a suction cup to create tension, and simultaneously enter a plastic card or a special line under the battery.
The movements should be smooth, sawing. Don't try to knock the battery on one end, it can cause it to deform and heat dispersal. Gradually move inwards, cutting the adhesive layer. If the battery is swelling, be very careful not to break through the shell.
What to do if the battery is not detached?
After removing the old battery, carefully clean the seat of glue residue.Put the new battery on fresh bilateral tape, pre-connecting a test plume to check the operability before final assembly.
Table of main characteristics and screws
When assembling the device, it is crucial not to confuse the screws, as they come in different lengths and threads. Below is a reference table that will help you navigate the Xiaomi Redmi 4 Pro fasteners.
| Location of the screw | Type of thread | Length (example) | Number of |
|---|---|---|---|
| Rear metal cover | Cross PH00 | 3.5 mm | 10-12 pcs. |
| Motherboard fastening | Cross PH000 | 2.8 mm | 4 pcs. |
| Charging charge (lower) | Cross PH00 | 4.0 mm | 2 pcs. |
| Dynamics (polyphonic) | Cross PH00 | 3.0 mm | 2 pcs. |
Using a screw of the wrong length can cause it to rest into the battery or screen, creating a pressure point, which over time will lead to black spots on the display or damage to the batteries.
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When you build back, you first make all the screws, and only then tighten them, which will avoid distortion of metal plates and damage to the threads in the plastic case.
Assembly of the device and verification of functionality
You assemble it in reverse disassembly, you put the motherboard in your seat, make sure all the holes match the mounts, you plug in the main plumes: the display, the touchscreen, the battery, and only after you plug in the battery, can the device turn on.
Before you install the metal protection and the back cover, make sure to test it. Press and hold the power button. If you have an image on the screen and the sensor is working, you can continue building, which will save you time in case you forgot to plug in any plume.
When installing the back cover, make sure all plumes are stacked in their ducts and don't protrude outside the body. Apply new glue or use special tape to fix the back panel. Press the edges around the perimeter evenly.
- ✅ Check the operation of all buttons (volume, on) for a clear click.
- ✅ Make sure the speaker sounds clean and without wheezing.
- ✅ Check the microphone through the recorder.
- ✅ Test Wi-Fi and Bluetooth modules.
⚠️ Warning: If the phone doesn't turn on after assembly, don't rush to disassemble it again. Connect it to the charger on the phone. 15-20 minutes - the battery may have been completely discharged during the operation.
Frequent problems in disassembly and their solution
During the repair process, users often face a number of typical problems, such as the plume of the touchscreen can come off when the metal protection is not neatly removed, in which case the plume or the entire display module assembled will need to be replaced.
Another common mistake is damage to the antenna module. The antenna in Xiaomi Redmi 4 Pro is made in the form of a sticker on the inside of the back cover and a plastic insert. If it is not neatly opened, it can break, which will lead to a deterioration in signal reception.
☑️ Post-assembly check
Also worth mentioning is the "Bootloop" problem after assembly, which often happens if the plume of the display or battery is not fully connected, disassemble the device again and check the connector density.
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The key to a successful disassembly is to take your time. Every movement must be conscious, and the force applied must be minimal, so if something doesn't go, you've missed the screw or not warmed up the glue.