Xiaomi Redmi 7A has proven to be a reliable budget device, but from time to time even the most durable equipment requires intervention. The need to remove the back cover can arise for various reasons: replacing broken glass, installing a new battery or cleaning the speakers from dust. Unlike the flagship models with moisture protection, the design of this device is relatively simple, but requires accuracy.
The challenge is that the body is held on a powerful adhesive layer around the perimeter, and a sloppy autopsy often causes cracks in the frame or damage to the internal plumes, and before you start, you need to carefully prepare the workplace, provide good lighting and be patient, and haste in this process is the main enemy.
In this article, we will take a closer look at the process of removing the back panel, what tools will be required, how to heat the adhesive properly, and how to avoid common mistakes. A well-designed disassembly is the first step to successfully repairing your gadget.
Tools and workplace preparation required
To successfully complete the task of dismantling the case, you will need a minimum set of specialized tools. The use of improvised tools such as knives or thick needles is strongly discouraged, as they can damage internal components or scratch the screen. Professional approach begins with the right choice of equipment.
First of all, you'll need a heat source, which could be a special thermophene for electronics, a household heating pad, or even a hair dryer, which is less efficient, and you also need a suction cup to carefully pull the lid off, and a set of mediators or plastic blades, and use metal tools with extreme caution.
- 🔥 Thermophen or hot water heater for softening glue
- 🛠️ A set of plastic mediators and shoulder blades
- 🧲 Suction cup for lifting back panel
- 🔦 Powerful lamp for illumination of the working area
Preparation of the workplace is also critical: the surface of the table should be clean, flat and do not conduct electricity. Cover the table with an antistatic mat or just a clean sheet of paper to avoid losing small screws and damaging the soft elements of the case. Be sure to turn off your smartphone before starting any work to avoid short circuits.
The procedure for heating the glue layer
The factory glue that holds the Redmi 7A back is very hard at room temperature, and trying to tamper with the panel without heating it beforehand will cause the plastic to crack under the pressure of the tool, and your job is to warm the perimeter of the device evenly, making the adhesive compound elastic.
Turn on the thermophene and set the temperature to 80-100 degrees Celsius. Direct the hot air to the ends of the smartphone, moving the device around. Pay special attention to the corners, because there is a layer of glue usually thicker. The heating process takes from 2 to 5 minutes depending on the power of your equipment.
⚠️ Attention: Don't keep the hair dryer still in one point for too long.Local overheating can damage LCD-Always check the temperature of the back side with your hand - it should be hot but tolerant to touch.
Once you've warmed up, you move on to the next stage immediately, and the glue cools down quickly and hardens again, so you need to act quickly, but without any sudden movements. If you use a heating pad, put the phone down on it with the screen and leave it on the back. 10-15 minute.
Rear panel detachment technique
Once the body is warm enough, take a suction cup and securely attach it to the bottom of the back cover, closer to the MI logo. Smoothly pull the suction cup upwards, creating a small gap between the frame and the plastic. In the resulting gap, carefully insert a thin plastic mediator.
Don't try to pull the lid off with a jerk. Your goal is to cut the adhesive layer around the perimeter. You drive the mediator along the edge, wiggle it slightly from side to side. You move consistently: first the bottom face, then the sides, and only at the very end is the top where the train is located.
☑️ Checklist before removing the cover
If you feel a lot of resistance, stop and warm up again, and excessive force is the most common cause of plastic latches breaking inside the case, and slow and smooth movement ensures that all elements are intact.
Working with internal components and plumes
Once the glue is cut on the sides and bottom, don't be in a hurry to completely remove the lid. At the top of the smartphone, under the logo, there is a plume of a fingerprint scanner (if the model supports fingerprint unlocking) or just connectors. A sharp movement can break this thin conductor.
Carefully lift the top edge of the lid and look inside, you'll see a plastic bar or a direct connection to the motherboard. In some versions of the Redmi 7A, the fingerprint scanner can be integrated into the back cover, in which case you need to very carefully snap the plume connector with tweezers or a nail.
| Component | Location. | Risk of damage | Action. |
|---|---|---|---|
| Scanning plume | Upper end | High-pitched | Tweezers off. |
| Battery | Central part | Medium. | Don't poke through. |
| Main camera. | Upper left corner | Low. | Don't push. |
| Dynamician | The bottom part | Low. | Check the contacts |
Only when you make sure that there are no more connections between the lid and the body, you can completely remove the back panel. Put it on the outside down on the soft fabric so that you don't scratch the logo or the camera.
Typical mistakes when disassembling a smartphone
Many users make mistakes that lead to costly repairs, one of the most common being using a metal blade instead of plastic, and the metal easily slips off and cuts plumes or breaks through battery insulation, which can lead to a fire.
Another mistake is not heating up enough, and in an effort to save time, the new masters start picking on the cold case, which almost guaranteed to cause cracks in the plastic frame that can't be hidden, and patience is more important than speed.
What to do if the lid is cracked?
Also, you often forget to turn off the scanner plume, and the snatch at that point breaks the contacts, and the fingerprint unlock function stops working forever, because in this model, the scanner is often paired with the board. Be careful of the details.
Assembly and sealing of the shell
After the necessary repairs (battery replacement, speaker cleaning) the device must be reassembled. the old glue will no longer hold the lid, so you need to use a new adhesive. The best option is a special adhesive B-7000 or T-7000, as well as ready-made adhesive frames for Xiaomi Redmi 7A.
Apply a thin layer of glue around the perimeter of the frame of the case. Don't overdo it: excess glue can leak out or get inside the contacts. Let the glue dry a little (about 1-2 minutes), then carefully combine the cover and press it around the perimeter.
For reliable fixation, it is recommended to wrap the smartphone with cruciferous rubber bands and leave it to dry for 4-6 hours, this will ensure uniform fit and restoration of tightness (as much as possible for this model).
⚠️ Warning: Do not turn on the phone immediately after assembly if you have used liquid glue.Adhesive vapors can condense inside and cause contact oxidation.Let the device dry completely.