Broken glass or black screen smartphone — a situation familiar to many owners of Xiaomi. the Redmi 7 model, released in 2019, is still actively used due to its reliability, but time takes its toll, and physical damage to the matrix becomes the main obstacle to comfortable operation.
Recovery requires precision, a dedicated tool, and a clear understanding of the design of the device. In this article, we will discuss every step of the way, from choosing a quality module to final testing of the sensor layer. It is important to understand that replacing glass separately from the matrix at home is almost impossible without professional equipment, so we will talk about the complete replacement of the module in the assembly.
Before you start disassembling, you need to prepare the workplace, you need a clean, well-lit surface, free of dust and static electricity, and improperly performed procedure can damage the plumes or other internal components, so follow the instructions carefully, without missing a single step.
Diagnostics and selection of components for Redmi 7
The first step is to diagnose the problem accurately, so if you see cracks on the screen, but the image is clear and the sensor is responding, maybe only the glass is damaged. However, if there are black spots, stripes, touchscreen does not work or the screen is completely black when the device is turned on, you will need to replace the entire display module. IPS-resolution-matrix 1520x720 Things to consider when ordering a spare part.
There are several types of modules in the parts market, and their quality varies significantly. Original modules (OEMs) are often labeled "Original" on the plume and come in a protective metal frame. Cheaper copies (Hard Glass, Incell) can differ in color reproduction, glass thickness and sensor sensitivity. When buying, be sure to check compatibility, as there are different revisions of panels for the same model.
When choosing a supplier, pay attention to the presence of a protective film on the matrix and the integrity of the plumes. Cheap analogues often sin with the wrong calibration of brightness or lack of autobrightness. It is also worth checking the connection connector: it should be identical to the native one, without backlashes and oxidation of the contacts.
Tools and preparation for work required
To make the repair work, you will need a minimum set of tools that can be purchased from any radio parts store or ordered online. The absence of even one can complicate the process or lead to breakage of fasteners. Pay special attention to the quality of the suction cup and mediators, since the Redmi 7 body has a plastic back cover that is easy to damage.
Here is a list of the equipment needed for the job:
- 🔧 Set of screwdrivers (cross-haired) PH000 flat)
- 📱 Plastic blades and mediators (2-3 stuff)
- 💨 Hair dryer construction or household (to soften glue)
- 🧲 Magnetic mat or organizer for screws
- 🧹 Alcohol isopropyl or special liquid B-7000
- 🧤 Antistatic gloves (optional)
Before starting work, be sure to turn off the smartphone and remove the tray. SIM-This is a critical step, as trying to remove the tray after starting disassembly can damage the internal plumes. 20-30%, to minimize the risk of fire in case of accidental battery damage, although in Redmi 7 The battery is located under a metal protective plate.
☑️ Checking readiness for repair
Rear cover removal and protection process
Xiaomi Redmi 7 is designed to allow internal components to be accessed through the back cover, and it's glued around the perimeter with a special adhesive that needs to be warmed up. Use a hair dryer that warms up the end of the device evenly for 2-3 minutes. Temperatures should not exceed 80-90 degrees so as not to damage the plastic elements of the case.
⚠️ Warning: Don't heat the camera area too much, as the optical stabilization and sensor can fail from overheating.
After warming up, gently insert the suction cup at the bottom of the back cover, stepping about 1 cm from the edge. Pull the suction cup up, creating a small gap, and insert a plastic mediator into it. Drive the mediator along the perimeter, gradually snapping the clips and cutting the adhesive layer. Move slowly so as not to break the plastic of the cover or damage the fingerprint scanner plume if it is glued to it.
Once you remove the lid, you'll see a metal plate covering the mainboard and the battery, which is secured by a lot of screws of different sizes. Use a magnetic mat to remember the location of each screw, because their length and thread may vary. Unscrew all the screws around the perimeter and in the center, carefully remove the metal protection by putting a plastic blade on it.
Disabling plumes and removing the old module
Under the metal shield, you can see the motherboard and the display connectors, and before you disconnect the plumes, you need to turn off the battery, find the battery connector, and gently snap the connector off with a plastic blade, which will turn the device off and prevent short circuits when you're working with other components.
Then we turn off the display itself. The screen plume in Redmi 7 connects to the main board through a wide connector located next to the battery connector. Sometimes there may be an additional pinch bar on top of the connector that needs to be unscrewed. Once the connector is free, gently pull the plume tongue upwards without putting too much effort.
What to do if the plume does not snap?
Now you can remove the module itself. Unlike many modern smartphones, Redmi 7 has a framed screen, so you either have to gently unstick the old display from the frame using a hair dryer and a thin line, or change the screen with the frame (if you bought a framed module), the first option is more complex and requires skill, the second one is simpler, but requires you to move all the small parts (dynamics, vibrator, button plumes) from the old frame to the new one.
Installation of a new display and assembly of the device
If you only change the glass with the matrix, carefully clean the frame of the residue of old glue. Use alcohol and blade, but act carefully not to scratch the plastic. Apply a thin layer of special glue B-7000 or use double-sided tape for screens around the perimeter of the frame. Make sure that the glue does not fall into the area of the camera or dynamic speaker.
Put the new module in a frame, pressing it tightly around the edges. Let the glue grip for 10-15 minutes. Then you can start connecting. Put the display plume into the connector before the characteristic click. Make sure the plume is flat, without any clamps. Connect the battery and check the screen performance without fully assembling the device.
To check, turn on your smartphone with the power button. If the image appears, check the touchscreen, dragging the icons all over the screen. Make sure there are no dead zones and color reproductions. If everything works correctly, turn off the phone, turn off the battery and continue building in reverse order.
| Work phase | Implementation time | Difficulty | Risks. |
|---|---|---|---|
| Warming and removal of the lid | 5-7 minutes | Low. | Cracking lid. |
| Unscrewing protection | 3-5 minutes | Medium | Loss of screws |
| Shutting down the plumes | 2-3 minutes | Tall. | The plume break |
| Replacement of the module | 10-15 minutes | Medium | Dust under the screen |
Typical mistakes and expert advice
One of the most common mistakes is to unscrew the screws in a hurry. Redmi 7 uses screws of different lengths for different nodes. If you screw a long screw into a short hole, you can punch a board or damage the thread in the plastic, which will make further assembly impossible. Always check the length of the screws with their original seats.
Another common problem is the dust falling under the new screen. Even a small mottling will be visible against a black background and can cause broken pixels to appear over time. Build indoors with minimal dust, pre-wiping the working surface with a wet cloth. Before the final screen sticker, blow out the pear frame to clean the optics.
💡
Use isopropyl alcohol to degrease the frame before applying new adhesive, which will ensure maximum adhesion and prevent the screen from peeling off in the future.
Remember to calibrate. After changing the display, you may need to reset or calibrate the sensor through the engineering menu. To do this, type ##6484## in the call app (if available), or use the touchscreen calibration apps from the Play Market to help eliminate problems with incorrect touch response.
⚠️ Warning: If the phone doesn't turn on after assembly or the screen doesn't light up, don't panic. Check the density of the plume connector. Often the problem is in the unmoistened connector or the contaminated contacts.
💡
The quality of the glue and the purity of the assembly determine the durability of the repair no less than the quality of the display module itself.