Smartphone Xiaomi Redmi Note 4X deservedly considered one of the most reliable devices of its time, however, a physical fall or strong pressure can lead to glass breakage or the appearance of black spots on the matrix. Restoring the health of the gadget in this case requires a complete replacement of the display module, since in modern assemblies the glass and matrix are soldered into a single non-collapsible unit. Self-repair allows you to save a budget compared to contacting the service center, but requires accuracy, patience and the presence of a basic set of tools.
Before starting the procedure, you should be clear that you are removing the device from the warranty if it is still relevant, and take responsibility for the integrity of the internal components. The process of replacing the display module on this model has its own features related to the design of the metal case and the location of the plumes. In this guide, we will discuss in detail each step, from the preparation of the workplace to the final check of the operability of the touch screen and matrix.
The quality of a new part directly affects the brightness of the picture, sensor sensitivity and battery life, so the choice of components should be approached responsibly. A low-quality analog can quickly fail or have a distorted color reproduction, which will negate all repair efforts. Next, we will consider how to choose the right screen and what tools will be needed to successfully perform the operation.
Tool preparation and selection of components
To replace the screen with a quality Redmi Note 4X, you will need a specialized set of tools that will ensure safe dismantling and installation of new components. The main working tool will be a heating element, which can be used as a professional heating pad, thermophene or, in extreme cases, a heated iron wrapped in fabric. The heating temperature should not exceed 80-90 degrees Celsius, so as not to damage the plastic elements of the frame and the adhesive base.
The second critical group of tools are mechanical devices to open the body and disable the plumes. You will need suction cups to carefully pull the display, thin plastic mediators or cards to peel off the glue, and a set of screwdrivers with a cross sting PH000. Metal tools such as tweezers or shoulder blades should be used with extreme care so as not to damage the plumes or shorten the battery.
- 🔧 A set of precision screwdrivers (cross and flat)
- 🔥 Heater for heating the body or building hair dryer
- 🃏 Plastic cards, mediators and suction cups
- 🧲 Magnetic screw-sorting mat
- 🧴 Clay. B-7000 or special adhesive tapes for the display
When choosing a new display for Xiaomi Redmi Note 4X It is important to consider the type of matrix, since this model was supplied with the IPS-There are original parts on the market, and there are also copies of quality. OEM and OLED-The original module will provide better brightness and viewing angles, whereas cheap copies often have a less sensitive touchscreen and thicker glass, which can lead to problems with the installation of protective glass in the future.
Rear cover removal and battery removal
Redmi Note Disassembly Process 4X Starts with turning off the device and removing it. SIM-The adhesive that holds the lid to the metal frame softens when heated, allowing it to be suctioned with a suction cup and slowly separated along the entire circuit with a plastic map. Excessive efforts should not be made, as the plastic of the cover is fragile and can crack in the places where the buttons or the camera are mounted.
When you remove the back panel, you get access to the insides of the smartphone, where you first have to unscrew a lot of screws that fix the plastic protective lining. Under this lining, you have a battery pack that's glued to the body quite tightly in this model. To safely remove the battery, you need to warm up the battery area again slightly or use a special hood so that you don't damage the battery shell and cause a short circuit.
☑️ Safely extracting the battery
The critical point at this point is to completely disconnect the battery plume from the motherboard before any manipulation of other components. Even if the phone is turned off, there may be residual voltage left in the circuit that can disable the power controller if the contacts are accidentally closed, and only after the battery is physically turned off can the device be considered safe for further dismantling.
⚠️ Warning: Never try to remove the battery by putting metal objects behind the center.Puncture of the lithium polymer battery shell will cause instant ignition and possible explosion.
Disabling plumes and removing the old display
Once the battery is removed or safely disconnected, you can start dismantling the display module itself. The screen in the Redmi Note 4X is held on a double-layer glue and is fixed by several screws at the bottom of the frame that you need to unscrew. Before unplugning the matrix, be sure to disconnect the camera main module plume and touchscreen plume if they interfere with access to the screen mounting elements.
To separate the broken display, you need to reheat the front of the smartphone to soften the adhesive layer around the perimeter. Using a suction cup, create a slight voltage on the glass, and carefully inject a thin plastic card or a special string into the gap between the frame and the display. The movements should be smooth and translational, without sharp jerks, so as not to damage the metal frame or the remaining entire parts of the matrix.
Special attention should be paid to the area at the top of the screen where the proximity and light sensors are located, as well as the conversational speaker. Often the plumes of these components can be glued to the back of the display, and they must be very carefully separated with a scalpel or a thin needle. Damage to the proximity sensor plume will not go out during the conversation, which will create discomfort when using the phone.
What to do if the plume is broken?
Installation of a new module and testing
Before the new display is finally glued, pre-testing is required to make sure the spare part is working, plug the new screen and touchscreen plumes into the motherboard, gently place the battery on top (without sticking) and turn on the device. Checking should include visual inspection for broken pixels, checking for multi-touch operation and testing the proximity sensor.
For deep diagnostics, you can use the Xiaomi Engineering Menu, which contains built-in hardware tests. To log in, you need to dial ##6484## in the Phone app or go through the settings. In the Engineering Menu, select items related to the display (LCD) and the TouchPanel to make sure that there are no dead zones and color reproduction is correct.
| Verification parameter | Normal condition | Signs of defect |
|---|---|---|
| Color rendering | Uniform, spotless. | Yellow or blue spots, stripes |
| touchscreen | Responds to touches throughout the area | There are blind spots, spontaneous taps. |
| Approximation sensor | The screen goes out when the top is closed | The screen is not responding to the overlap |
| Brightness | Adjusted by a slider | Doesn't change or is too dim. |
If all tests are successful, you can proceed to the final assembly: clean the frame of the residues of old glue with alcohol or a special solvent, degrease the surface and apply a new layer of glue B-7000 or use pre-prepared adhesive tapes. Carefully install the display, press it around the perimeter and let the glue dry for 15-20 minutes before final assembly of the case.
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Apply the glue in a thin continuous strip along the perimeter of the frame, avoiding the glue entering the screw and speaker holes. Excess glue, protruded when pressed, is easily removed with a dry wipe until solidified.
Build a smartphone and calibrate the sensor
Once the adhesive is dryed and the display is framed, put all the internal components in place in reverse disassembly. Connect the main and front camera plumes, make sure the connectors are snapped to a characteristic click, and securely secure the metal clamping plates with screws. Assembly errors such as an unpressed plume can lead to unstable camera operation or no sound in the conversational speaker.
In some cases, after replacing the touchscreen, it may need to be calibrated, especially if you installed a non-original module. Calibration allows you to synchronize the coordinates of the touches with the display on the screen, which eliminates the problem of "swimming away" the cursor or inaccurate hitting the icons.
The final step is to install the back cover, which also needs to be warmed up and glued around the perimeter to restore the tightness of the case. Although the Redmi Note 4X does not have full moisture protection, a quality adhesive layer will protect the internals from dust and splashes. Once fully assembled, turn on the phone and run the final test of all the functions: calls, Wi-Fi, Bluetooth and sensor operation.
⚠️ Warning: Do not turn on the device unless you are sure that all the plumes are connected correctly and are not clamped by metal parts of the case.A short circuit can instantly burn the motherboard.
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The key to successful assembly is cleanliness at the gluing site and the correct sequence of the plumes. Take your time to twist the screws until you make sure that all the connectors are sitting tight.
Frequent problems after replacement and their solution
Even with a neat replacement, users can face a number of typical problems that are often solved without re-disassembling the device. One common complaint is a failed proximity sensor that keeps the screen from going out during a conversation, which can be caused not only by damage to the plume, but also by improper calibration or contamination of the sensor's protective glass with glue.
Another problem can be the appearance of yellow spots on the edges of the screen or uneven backlighting, which often indicates excessive pressure on the frame on the matrix or the use of a poor-quality analog. If you notice that the touchscreen reacts with a delay or “gluts” in certain areas, try resetting to the factory settings or recheck the density of the plume to the contact area.
- 📉 Low brightness: Check the settings and make sure that no power saving mode is turned on.
- 👆 Blind Zones: Calibrate the touchscreen through the engineering menu.
- 📞 Sensor not working: wipe the top of the screen and check the integrity of the plume.
- 🔋 Fast discharge: make sure the battery plume is plugged in before the click and not squeezed.
If after changing the screen, the phone stopped charging or sees SIM-The error card may have damaged the charging plume or antenna contact during assembly, and requires a careful re-disassembly and visual inspection of all connections. 4X is part of the antenna system, and poor contact antenna antenna antenna antenna antennae can significantly impair the quality of communication.