The Xiaomi Redmi Note 4 is deservedly considered one of the most reliable devices of its time, but even the legendary workhorse has vulnerabilities.The screen is the first part that suffers when falling, and often cracked glass or an extinct display becomes the only barrier between you and the full use of the gadget. Self-replacement module is a real way to save a significant amount, since service centers often account for up to 70% of the cost of the device itself in the secondary market.
Before you start disassembling, you need to clearly understand what type of damage you have suffered. In the case of the Redmi Note 4 (codenamed Snapdragon 625 or Snapdragon). MTK-version) often breaks only the outer glass, but the matrix remains intact, but to replace the glass separately at home without special equipment is almost impossible. Therefore, we will be considering replacing the screen module assembled, which is the only reasonable solution for self-repair.
The process requires precision, a special tool and an understanding of how the interior of the phone works. Don't be afraid of the complexities: Xiaomi's design is quite logical, and the screws are arranged predictably, the main thing is to take your time and carefully monitor each step, so as not to damage the plumes or plastic latches of the case.
Tools and workplace preparation required
The success of the operation depends on preparation, 90%. You don't need a professional soldering table, but a minimum set of tools is required. First of all, you need a high-quality cross screwdriver, preferably magnetic, since the screws in the Redmi Note 4 are small and easily lost, and an indispensable assistant will be a plastic blade or mediator, which will help open the case without scratches.
Special attention should be paid to heating equipment. The glue holding the display at room temperature is very strong. Using a dryer (better a construction, but you can also use a household heater at maximum temperature) or a special heating pad is a critical step. Without preheating 80-90 degrees, you risk just crumble the new screen when you try to separate it.
- 🔧 Set of screwdrivers (cross-haired) PH000 and PH00) and plastic blades.
- 🔥 Building hair dryer or heating pad for heating the glue base.
- 💧 Isopropyl alcohol or special liquid for dissolving glue B-7000.
- 🧲 Magnetic mat or sheet of paper for sorting screws by disassembly stages.
The workspace should be well lit. It is advisable to use a cold-light desk lamp to clearly see the fine details and condition of the contact areas. Prepare the screw containers in advance by signing them with a marker: "Clause", "Plate", "Dynamic", which will save you time when you build.
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Rear cover removal and protection of components
The process begins with the removal of the back panel. Unlike many modern smartphones, in Xiaomi Redmi Note 4, it is not glued to the perimeter, but is held on latches and several screws. Turn the phone over and unscrew the two screws at the bottom of the back cover, on the sides of the charging socket. After that, gently apply the lid with a plastic spatula in the area of the socket for the charger. SIM-map or bottom.
Move the shoulder blade along the perimeter, snapping plastic locks. Don't use excessive force: if the lid fails, check if all screws are twisted. Once you remove the lid, you will have access to the insides, where the metal safety frame and battery immediately catch your eye. The first thing you need to do is to disconnect the battery plume from the motherboard to turn off the device and avoid short circuit.
⚠️ Warning: Never attempt to disconnect the display plume or other connectors while the battery is connected to the board.This can cause the power controller or backlight to burn.
Next, you take off the metal plate that covers the top of the motherboard, which is secured by several screws of different sizes, so it's important to remember their location. Under this cover, you hide the plugs of the display and touchscreen. Carefully snap the connectors using a plastic blade or nail, but not a metal screwdriver.
Nuances of the Redmi Note 4 screws
Removal of the old display module
The most difficult step is to separate the broken screen from the metal frame of the case. As mentioned, Xiaomi uses double-sided tape around the perimeter. Turn on the hair dryer and evenly warm the edges of the front panel for 2-3 minutes. The temperature should not be extreme so as not to damage the plastic frame, but sufficient to soften the glue.
After warming up, insert a thin plastic card or spatula into the gap between the glass and the frame. Drive the tool slowly, making cutting movements to cut the glue layer. Be especially careful in the corners and in the area of the home button, where the glue can be applied more abundantly. If you feel strong resistance, stop pulling and warm up the area again.
- 🌡️ Warm up the screen perimeter evenly without holding the hair dryer at one point longer than 5 seconds.
- 🪚 The movements of the shoulder blade should be parallel to the plane of the screen so as not to damage the frame.
- 🧩 Gradually increase the gap by inserting the mediator deeper as the module unplugs.
When the module is completely separated from the frame, it can be removed. However, often a new screen comes without a frame, and you have to glue the old module into your frame. To do this, the old broken screen must be completely removed from the frame, carefully cleaning all the remnants of glue and glass to perfect smoothness.
Installation of a new screen and assembly of the device
Before installing the new module, degrease the frame with alcohol. Apply a new layer of glue (special B-7000 or double-sided tape for phones) around the perimeter of the frame. Set the new display module tightly pressed at the edges. Let the glue grab for 10-15 minutes before continuing assembly, otherwise the screen may "walk" or move away with time.
Connect the new screen plumes to the motherboard, make sure they're inserted before the characteristic click and are fixed with the clamping slats, and then you can temporarily plug the battery in and check the performance of the image, touchscreen and backlights. If everything is working correctly, turn off the battery again and install the metal cover in place, twisting all the screws.
| Component | Action. | Important nuance |
|---|---|---|
| Battery | Disable first. | Remove the protective film before disconnecting the plume |
| Display plume | Disconnect after battery | Pull strictly upwards, without shaking to the sides |
| metal frame | Clean the glue. | Use alcohol to avoid scratching aluminum |
| Glue B-7000 | Ply it thinly | Avoid getting glue into the speaker and camera |
The final step is to put the back cover in place. Make sure all the plumes are stacked correctly and don't protrude beyond the body. Insert the lid at an angle, snap the top locks, then press the perimeter until the bottom ones click. Twirl the two outer screws.
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After assembly, put the phone under the press (for example, under a stack of books) for 1-2 hours, this will ensure maximum adhesion of the glue and no gaps between the screen and the case.
Touchscreen calibration and quality control
After changing the screen, software calibration is often required, especially if you used a non-original copy or a quality analog. There is a hidden engineering menu in the MIUI shell that allows you to check and adjust sensitivity. To enter it, open the Phone application and type ##6484##.
On the menu that opens CIT (Customer Information Test: Select the item associated with "Touchpanel" or "Single Touch." Follow the instructions on the screen: usually swipe the lines or press the dots. If the touchscreen is not working correctly (missing presses or "phantomite"), the same menu often has a calibration option.
⚠️ Attention: If the touchscreen still doesn't work properly after replacement and calibration, the problem may be a defective plume or damage to the contact pad during installation.
It is also worth checking the proximity sensor, which is often in the upper speaker or under glass.Wash the inside of the screen in the area of the upper speaker with alcohol, as fingerprints can knock its readings, which will not go out during the conversation.
Typical errors and troubleshooting
Even experienced craftsmen sometimes have problems after assembly, and one of the most common is the lack of image when the backlight is on (the screen is glowing white), which means that the display plume is not fully inserted or squeezed, you need to carefully disassemble the top and reconnect the connector.
Another common problem is that the screen is detached at the edges a week after repair, which is due to poor cleaning of the frame from old glue or the use of poor-quality adhesives. In Redmi Note 4, the frame is aluminum, and the adhesion to it requires thorough degreasing.
- 🔌 Screen not turned on: check if the light connector is connected (usually wider than the main one).
- 🖐️ Touchscreen does not work: make sure that the protective film from the new module is removed completely.
- 🔊 No sound in the speaker: check if you passed the plume of the lower board when assembling.
If you notice that the phone starts to run out quickly after replacing, check the power consumption in the settings. Sometimes, if you change it carelessly, you can damage the battery insulation or plume, which causes a micro-short circuit.
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The quality of a new part determines 80% of the success of a repair. Cheap copies of screens often have a dull matrix and a poor touchscreen that quickly fails.