Smartphone Xiaomi Redmi 7A deservedly considered one of the most reliable budget of its time, but even a durable case does not always save from falls or mechanical damage. Broken glass or the appearance of stripes on the matrix is not a reason to throw the device, because replacing the display with Redmi 7A is quite possible even for a novice master with the right tools and patience. Modern modular assemblies greatly simplify the process, as they often change along with the frame.
Before you start, you need to clearly understand what kind of problem you are facing: whether only the outer glass is damaged or the OLED/LCD matrix itself is broken. If the image is distorted, black spots are present or the sensor does not respond to touch, then you will need a complete replacement of the module. It is important to prepare the workplace in advance, since the process requires accuracy and good lighting, so as not to damage the plumes.
In this article, we will discuss in detail the entire process of dismantling the old panel and installing a new one, paying special attention to the nuances of working with adhesive base and thin plumes. Sensor calibration and checking the tightness of the assembly are the final steps that can not be ignored for the durability of repairs.
Diagnosis and selection of components
Before you start disassembling, make a thorough diagnostic of the device, connect the phone to the charger and try to turn it on to assess the nature of the damage. If the screen is completely black, but the phone vibrates when you call, it is likely the problem is in the backlight or the plume. If you see colored stripes or broken glass, you need to replace the display module.
When choosing a new part for the Redmi 7A, it is critical to pay attention to the type of matrix and the presence of a frame. Original builds provide better color reproduction and sensor accuracy, while cheap copies (Copy) can have less brightness and backlash when installed. The Redmi 7A model uses an IPS LCD panel with a resolution of 1520x720 pixels, and trying to install a matrix from Redmi 7 (without the letter A) will lead to incompatibility of plumes.
Buying a pre-framed module makes it much easier, as you don’t have to glue the glass and clean the remnants of old glue, which is extremely difficult to do at home. Make sure that the kit comes with a new B-7000 glue or double-sided tape, as well as a protective film on the back of the screen.
⚠️ Warning: When buying a spare part, check the integrity of the plume and the absence of broken pixels before installation. Once the module is glued, it will be almost impossible to return it to the seller.
Tools and training required
To perform the repairs, you need a specific set of tools, without which there is a risk of damage to the body or new parts. The main tool is the heating element, since the back cover of Xiaomi is supported by a powerful adhesive layer. The use of a hair dryer is inefficient, it is necessary to use a building hair dryer or a special heating pad to warm up the glue to a temperature of 80-90 degrees.
The second important aspect is a set of screwdrivers and mediators: you'll need a Phillips #00 cross screwdriver for the board screws and a thin metal or plastic mediator to snap the plumes. Don't use knives or sharp metal objects to tweak the screen, as you can damage the battery or plumes.
- 🔧 Building hair dryer or heat heat heater for softening glue.
- 🔧 Set of screwdrivers (cross #00, flat).
- 🔧 Plastic mediators and sucker.
- 🔧 Clay. B-7000 or E-8000 fixative.
- 🔧 dielectric-coated tweezers.
Organize the workspace: the table should be clean, dry and well lit. It is recommended to use a magnetic mat or container with cells to fold the screws in order of their extraction, since the Redmi 7A uses screws of different lengths and can not be confused.
☑️ Checking readiness for repair
Dismantling of the back cover and battery
The process of disassembly begins with the extraction SIM-Put the device down on the soft fabric and evenly warm the perimeter of the back cover with a hair dryer during the period. 2-3 Do not hold the hair dryer in one point for too long, so as not to overheat the battery or matrix, the movements should be smooth and circular.
After warming up, gently insert the suction cup at the bottom of the back cover and pull up slightly to create a gap. Insert a plastic mediator into the resulting gap and, as you make cutting movements, walk around the perimeter of the case, cutting the adhesive layer. Carefully avoid hitting the fingerprint scanner plume if it is glued to the lid.
When you take the lid off, you'll see the battery pack and a protective plastic bar covering the plumes, and the first thing you need to do is disconnect the battery plume from the motherboard to turn the device off, and then gently bend the lock and remove the connector using a plastic blade, avoiding the pressure on the motherboard itself.
⚠️ Warning: Never attempt to disconnect the battery plume without unscrewing the connector's metal shield, if present.This can short-circuit and cause the board to fail.
Next, you need to remove the battery, because it blocks access to the lower screws of the screen, carefully pull the special tongues (if any) or use a plastic card to jeopardise the battery. You can not heat the battery, as this can cause it to bloat or ignite.
Removal of the old display module
Once the battery is removed, you can access the screws that lock the display module to the middle frame. In the Redmi 7A, the screen can be mounted with screws around the perimeter or glued directly to the frame. If the screws are present, unscrew them all and fold them into a separate container.
If the module is glued, you will need to reheat the front of the phone. Put the phone up on the heating pad and warm up for about 3-4 minutes. Be extremely careful: overheating can damage the new module if it is already lying nearby, or deform the plastic elements of the case.
To remove the module, use a suction cup and a mediator. Tuck the module from one of the corners and slowly drive the mediator along the edges, gradually separating the glue. The main challenge is not to damage the plume, which in this model comes out on the side or bottom. The display plume is very thin and easily breaks when a sharp jerk.
When the module is free of glue, lift it up, but don't pull it far. First, you need to turn off the two main plumes: the plume of the display itself and the touchscreen plume (if they are separate) or one common plume. Click the connector locks on the board and carefully extract the contacts.
What to do if the plume is broken?
Installation of a new screen and assembly
Before installing the new module, be sure to try it on a frame without glue. Make sure that all the holes under the speaker, camera and sensors match, and the plume freely falls into place without clamps. Clean the frame from the remnants of old glue with alcohol or a special solvent, degrease the surface.
Apply a thin layer of B-7000 glue around the perimeter of the frame or stick a double-sided tape. Don't apply too much glue, otherwise the excess glue may squeeze out on the matrix or get into the connectors. Carefully stow the new module, aligning the edges, and slightly press the perimeter.
Connect the display plumes to the motherboard. Make sure the connector is up before clicking and is fixed with a pin down bar. Before final assembly and sealing, it is recommended to conduct an initial health check: connect the battery and turn on the phone.
- ✅ Check the uniformity of the lighting throughout the screen.
- ✅ Test the multi-touch (swipe your finger across all areas).
- ✅ Make sure there are no artifacts or dead zones.
- ✅ Check the front camera and proximity sensor.
If everything works correctly, put the battery back in place, plug it in, and fasten the safety bar, and then you can lock the back cover, apply a new layer of glue around the perimeter of the case, press the lid with rubber harnesses or a load for 15-20 minutes to polymerize the glue.
| Work phase | Implementation time | Difficulty | Criticism |
|---|---|---|---|
| Disassembly of the hull | 10-15 minutes | Medium | Tall. |
| Withdrawal of the module | 15-20 minutes | Tall. | Critical |
| Installation and glue | 20-30 minutes | Low. | Medium |
| Final assembly | 10 minutes | Low. | Low. |
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The quality of the adhesive application and the purity of the frame determine how tight the screen will sit and whether dust will get inside in the future.
Calibration and final checks
After the phone is built, it may be necessary to calibrate the sensor, especially if you notice slight biases when touching or "rattling" the cursor. Xiaomi smartphones often use an engineering menu for testing. To get into it, type in the code ##6484##.
In the menu that opens, select "Touchpanel" or "Sensor." Follow the instructions on the screen: you usually need to draw lines along the contours or click on certain points, which helps the system redefinite the boundaries of the touchscreen workspace.
Also check the light and proximity sensor. Close the top of the screen with your hand during the bell, the screen should go out. If the sensor is not working properly, you may have poorly cleaned the inside of the glass or misplaced the module, leaving a gap.
⚠️ Note: If the phone has stopped seeing after the screen has been replaced SIM-If you have a card or a sound gone, make sure that the bottom board plume or the antenna cable is compressed, and often when you're not tidy, you're affected by the adjacent components.
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After replacing the display, let the glue dry completely for 2-3 hours before active use of the phone and installation of protective glass.