Modern smartphones like the Xiaomi Redmi Note 4 have an all-metal body, making disassembly a challenge for the untrained user. Many owners face the need to access internal components when a broken display, worn-out battery or for thorough dust cleaning. However, the dismantling process requires not only accuracy, but also specific tools, since the design of the device does not involve frequent intervention.
Before you start, it is important to be aware of the risks: improper disassembly can lead to damage to the plumes, puncture of the battery or leakage of the case. In this article, we will take a detailed look at the dismantling process, highlight the key stages and point out critical moments where rush is unacceptable. If you are not confident in your abilities, you should contact the service center, but for enthusiasts this guide will be a useful assistant.
The success of the operation depends largely on pre-treatment, and the heat from the thermophen softens the glue that holds the display, making it safe for the matrix to remove, and we'll look at what tools you need, how to warm the case without overheating, and what nuances the disconnection of the plumes in the model with the Snapdragon 625 processor has.
Tools and workplace preparation required
For high-quality disassembly Xiaomi Redmi Note 4 conventional set of screwdrivers will not be enough. You will need specialized tools that minimize the risk of mechanical damage. Lack of the right tools often leads to chipping on the frame or tearing thin plumes, so collect everything you need in advance.
First of all, you need a heat source, which can be a thermophene exposed to a temperature of about 80-100 degrees, or a conventional heating pad, and an indispensable assistant will be a suction cup, which allows you to carefully raise the screen after heating the glue, without which there is a great risk of damaging the glass when you try to put a sharp object on it.
Below is a list of tools that will ensure a comfortable and safe operation:
- 🔧 A set of screwdrivers with a cross slit (PH000 or PH00) charge-pen.
- 🔥 Thermophen or heating pad for softening the adhesive layer of the display.
- 💳 Plastic card or mediator for snapping the latches of the body.
- 🧲 Magnetic mat or container for sorting screws of different sizes.
Special attention should be paid to the organization of the workspace. The surface should be clean, flat and well lit. Small screws are easily lost or confused, so sorting them by disassembly stages is a critical procedure. Using a magnetic mat will help you not confuse long screws with short ones, which can lead to a breakdown of the board during assembly.
☑️ Checking disassembly readiness
Rear cover removal and preparation for display removal
The first step in any disassembly is to remove the back cover. Unlike many modern models, the Redmi Note 4 does not require heating, as the lid is held on plastic latches.
First, remove the tray for SIM-And then you find a little dent in the bottom end of the case, and you gently put the lid on your nail or your plastic shoulder blade, and you run it around the perimeter, and you hear the characteristic clicks, and the locks are unfastened. Do not use metal objects as they may leave traces on aluminum.
⚠️ Warning: When removing the cover, be careful with the fingerprint scanner plume. It can be glued to the inside of the cover or connected to the board.
Once you remove the lid, you'll see screws that attach the bottom plastic cap (the antenna module) and screws that hold the main board. To access the display plume, you'll need to unscrew all the visible screws around the perimeter and remove the plastic lining at the bottom, which will free up the bottom of the case and give you access to the battery.
Now you have to warm up the front panel, the glue that holds the display module, when exposed to temperature becomes elastic. 2-3 Keep your hair dryer in one place so you don't damage it. LCD-frame-plate.
Nuances of work with glue B-7000
Disconnection of the battery and dismantling of the display module
The most critical thing is to cut the power, so before you pull the plume, you have to turn the device off, find the battery connector on the motherboard, and gently disconnect it with a plastic blade, and this will prevent short circuits from accidentally touching other contacts with metal tools.
Once the battery is turned off, you can start removing the screen. Use the suction cup to create a small gap between the frame and the display. Insert a mediator or a thin plastic card into the resulting gap. Drive the tool along the edges, cutting the heated glue. Movements should be smooth, without sharp jerks.
Raise the screen gradually, controlling the tension of the cable. If you feel resistance, check if the plume is stuck. Often you need to bend the metal frame a little or tamper with it from the bottom to make way for the cable.
After successfully separating the module from the body, disconnect the two main plumes: one is responsible for the image, the second is responsible for the touch scan. To do this, raise the locking bar (if any) or gently pull the connector up behind the special ears. Don't pull the wires themselves!
| Component | Type of attachment | Risk of damage | Tool. |
|---|---|---|---|
| Back cover. | Plastic latches | Latch break, cracks. | Mediator, sucker. |
| Display. | Glue B-7000 | Trail rupture, cracks | Thermophen, map |
| plumes | Clamp connectors | Contact break | Plastic spatula |
| Feed-in screws | Cross (PH00) | Licking the hat | Precise screwdriver. |
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When you turn off the display plume, never use metal tweezers.The metal can close contacts on the board, which will cause the power controller or backlight to burn.
Replacement of the battery and work with the motherboard
If your goal was to replace the battery, then after removing the display, access to it is completely open. The battery in the Xiaomi Redmi Note 4 is glued to the body with double-sided tape. Removing it may also require light heating of the back of the case (if it is not already removed) or neat scapula.
Never try to pick out a battery by piercing it or bending it. Lithium polymer cells can ignite if damaged. Cheat the battery from different sides, gradually separating it from the glue. The new cell is installed on a fresh layer of bilateral tape.
To access the motherboard, you need to unscrew all the screws holding it. Notice the length of the screws: they may differ. Long screws in the holes for short can break through the tracks on the board, which will lead to irreversible damage to the device. Remember or photograph the location of the screws.
When you remove the board, you get access to the bottom plume that connects the charging board to the main board, and this plume often fails, causing charging or microphone problems, and its replacement is simple: just unscrew the pin down bar at the bottom and disconnect the connectors.
⚠️ Note: When installing a new motherboard, make sure that all plume connectors (camera, display, buttons) are inserted before clicking. Unpressed connector is a common cause of broken functions after assembly.
Assembly of the device and verification of functionality
The assembly is done in reverse order, but it has its own nuances. Before you glue the display, you need to do an initial check. Connect the display and battery plumes, turn the device on and check the touchscreen, images, sound and vibration. Make sure everything works before you fix the module with glue.
If the tests are successful, apply a thin layer of B-7000 glue or special display glue to the frame of the new module or to the body. Press the screen and lock it with gums for 15-20 minutes before the initial grasp.
Then you put the motherboard, and it's important to put all the plumes in the right way so they don't get twisted or clamped, and the home button plume is particularly vulnerable, because it's easy to damage when you install the board, and you can just run it right down the chute.
The final step is to install the bottom plastic cap and the back cover, make sure that the antenna contact (usually a golden spring or a pint) matches the contact on the board, without which the network signal will be very weak or disappear altogether.
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Final check of all functions before complete gluing of the case will save you time and nerves, saving you from re-disassembly in case of a new part.
Frequent errors and precautions
Disassembling electronics is a no-brainer, and one of the most common mistakes is using too much force, and if you don't remove it, you forget to unscrew the screw or you don't get the glue right, and you use force to crack and break.
Another problem is static electricity. Although modern boards are protected, the risk of static breakdown persists, especially in dry rooms, work on an antistatic mat or at least regularly touch a grounded metal object.
Keep in mind the safety of the battery. If you notice that the battery is swelling, be very careful. A puncture of a swelling battery can cause fire, and it's best to extract it in a metal container or on a refractory surface.
Use only quality components. Cheap copies of displays often have poor color reproduction, low brightness and quickly fail. The original or high-quality copy (Grade A+) will last much longer and retain the declared characteristics of Xiaomi.