Xiaomi Redmi Note 7, also known as lavender, deservedly received the status of a “people’s” device due to the excellent ratio of price and quality. However, active use and the glass rear panel often lead to mechanical damage to the screen. If the display has stopped responding to touch or cracked, the owner faces the question of self-replacement of the touch screen.
Repairs at the service center can be expensive, so many users prefer to do the procedure themselves. Replacing the touch glass (digitizer) requires accuracy, patience and a minimal set of tools. It is important to understand that in this model, the touch screen is often bonded to the matrix, but you can find modules where they are separated, or change the assembly entirely.
Before you start dismantling, you need to assess your strength and time. The dismantling process takes from 40 minutes to 2 hours, depending on the experience of the master. Wrong actions can damage the plumes, battery or motherboard, so carefully study the algorithm of actions.
Diagnostics and workplace preparation
The first step is to diagnose the problem accurately. Make sure it's the touchscreen, not the software failure. Try restarting the device or entering Recovery mode. If the recovery menu sensor is working correctly, then the problem is software. If the reaction is not there or it is chaotic, you need to physically replace the component.
To successfully replace the touchscreen with the Redmi Note 7, you need to have a clean, well-lit workplace, an ideal table with an antistatic coating, or just a clean surface without a pile, and dust caught between the layers of the new glass and matrix can spoil the image quality.
⚠️ Warning: Be sure to turn off the battery before work begins! Even short-term closure of contacts with the battery connected can disable the power controller or burn the screen backlight.
You'll need a special set of tools that make disassembly of modern smartphones impossible, and using improvised tools like knives or thick needles increases the risk of damaging the case or piercing the battery.
- 🔧 Screwdriver kit: Phillips cross #000 and flat for opening the case.
- 🔥 Hair dryer or heating pad: to soften the glue under the back cover.
- 💳 Plastic card or mediator: for careful separation of the cover.
- 🧴 Isopropyl alcohol and suction cup: to facilitate the removal of glass.
Rear cover removal and access to the insides
The process begins with turning off the smartphone and removing the tray. SIM-The back of the Xiaomi Redmi Note 7 is glued around the perimeter, and to remove it, you need to warm the edges of the body with a hair dryer to a temperature of 60-70 degrees Celsius. Don't keep the hair dryer too long in one point, so as not to overheat the internal components.
After warming up, insert the suction cup into the bottom of the lid, create a vacuum, and pull up slightly. Insert a plastic card or mediator into the resulting gap, move the map along the perimeter, cutting the glue layer, be careful in the bottom where the fingerprint scanner is located, so as not to damage its plume.
When the lid is removed, you have access to the internal components, and first of all, you have to unscrew the screws that lock the plastic cover covering the plumes and the battery, and the number can vary, but it's usually about 10 to 12 screws of different sizes.
- 🔍 Fold the screws in order of their removal, as they may differ in length.
- 🔋 Turn off the battery plume first before touching other connectors.
- 🧤 Work in antistatic gloves or touch a grounded item frequently.
☑️ Check before removing the lid
Disconnection of plumes and removal of the old module
When the shield is removed, you need to turn off all the plumes that go to the motherboard. Focus on the main plume of the display and touchscreen. In Redmi Note 7, they can be combined into one wide connector or separated. Use a plastic blade to turn off, gently lifting the connector up.
The next step is to remove the display module itself, and it can also be glued to the frame of the case, walk carefully around the perimeter of the screen, separating it from the frame, and don't put too much effort into the center of the screen so that you don't crush the matrix if you plan to leave it intact.
If you change only the touchscreen (glass) and not the module assembled, you need to (separate) the glass and the matrix. It is a complex process that requires heating and using a thin string or knife. However, for most users, it is easier and more reliable to buy a new module assembled with a frame, which eliminates problems with glue and dust.
| Component | Type of connection | Location. | Features |
|---|---|---|---|
| Battery | Latched plume | Centre de la carte | First to turn off |
| Display (LCD) | Wide plume | Upper part | Fragile, requires care. |
| touchscreen | Separate plume | Near the LCD | He's often in the assembly. |
| Imprint scanner. | Round connector | Bottom of the hull | Don't stretch too hard. |
⚠️ Attention: The display and touchscreen plumes are very thin. If they are damaged (hall, rupture), the screen may stop working or show artifacts. Never pull the plume itself, only the hard part of the connector.
Installation of a new touchscreen and assembly
If you have a framed module, you make it much easier: you just have to move the motherboard, the battery and other small elements from the old case to the new one, and make sure that all the screw racks match.
When you connect the plumes, it's important to keep the sequence right, so first plug in the display plume, then the touchscreen, and then the battery at the end, and that minimizes the risk of short circuit, and once you've connected all the components, don't rush to twist the screws.
The initial performance test is critical. Turn on your phone and check the sensor response throughout the area, and pay special attention to the edges and corners where you're most likely to have problems calibrating or quality new glasses.
What to do if the screen is not turned on?
If everything works correctly, you can start the final assembly, apply a new layer of glue (B-7000 or special glue for screens) to the frame, press the back cover and lock the device with rubber bands for 15-20 minutes to polymerize the glue.
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Use an ultraviolet lamp to dry the glue if it requires UV curing, which will speed up the process and ensure a more reliable fixation of the lid.
Calibration and software configuration
After the physical replacement of the touchscreen on the Xiaomi Redmi Note 7, software calibration may be required. Android usually automatically detects a new sensor, but in some cases, the accuracy of the touchscreen can be reduced.
To get into the engineering menu, open the Phone app and dial ##6484#. In the CIT menu that opens, select the item associated with the touchscreen test. Swipe your finger through all the grid lines to make sure the sensor sees each touch.
If there is a shift in touch points or a cursor "shiver," resetting or recalibrating through third-party apps from Google Play can help, although system tools are usually more efficient.
- 📱 Take the test to draw lines in the engineering menu.
- 🔄 Check the multi-touch by clamping multiple points at the same time.
- 📉 Evaluate sensitivity when pressed with different strengths.
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The quality of the touchscreen depends not only on hardware, but also on the correct installation of the plume and the absence of dust under the contacts.
Frequent problems and their solution
Even with careful assembly, nuances can occur, and one of the common problems is that there are dead zones at the edges of the screen, which often means that the screws of the frame are twisted too much and pressing on the touch layer, or dust has fallen under the screen.
Another problem is spontaneous pressing (ghost touch), which can be caused by a poor touchscreen, poor grounding or damage to the plume during installation, and it is worth checking whether the plume is compressed when assembling the case.
If the fingerprint scanner has stopped working after replacement, check its plume. It is very short and easily breaks when the back cover is not neatly removed. In the Redmi Note 7, the scanner is integrated into the back cover, and its replacement requires re-adjustment of the new module.