Xiaomi Redmi 7A has proven to be a reliable budget device, but over time, even the most durable devices require intervention. The need to disassemble the gadget can arise for various reasons: the battery bloated, the display cracked or the speaker stopped working. Unlike the flagship models with moisture protection, the dismantling process here is relatively simple, but requires accuracy and understanding of the design.
Before you start, it's important to realize that any opening of the case automatically deprives you of warranty. If the device is still in service at the service center, you should contact the professionals. However, if you decide to act on your own, be patient and have the right tool. Quality repair begins with the correct preparation of the workplace.
In this article, we will take a closer look at each step of the Redmi 7A disassembly, learn how to safely remove the back cover, disable the plumes, and replace the main components, and follow the instructions to minimize the risk of damage to fragile electronics.
⚠️ Warning: Before starting any work, be sure to turn off your smartphone. Attempting to turn off the plumes under voltage can lead to a short circuit and the board fails.
The Xiaomi Redmi 7A isn’t just a screwdriver for a successful disassembly; it’s designed with a specialized set of tools to keep plastic latches and glass intact. The budget smartphone segment often uses glue to fix the elements, which requires a special approach.
You'll need a heating element, as the back panel is planted on a double-sided tape around the perimeter. A hair dryer or heating platform will help soften the adhesive. Do not use an open fire, as this can cause internal components to overheat or ignite.
- 🔧 Screwdriver kit: cross PH000 flat-work.
- 🔪 Plastic spatula (mediator) or thin knife to open the body.
- 💨 Hair dryer construction or household to heat the back cover.
- 🧲 Magnetic mat for sorting screws of different sizes.
- 🧴 Isopropyl alcohol or special liquid for glue removal (B-7000).
Prepare the container for small parts. The screws in the Redmi 7A can vary in length, and if you screw a long screw into a short hole, you can damage the motherboard. It is critical to remember the location of the screws under decorative plugs, because their absence is noticeable externally.
Removal of the back cover of the smartphone
The opening process begins with heating. Turn on the hair dryer and evenly warm the perimeter of the back cover for 2-3 minutes. The temperature should not exceed 90-100 degrees Celsius, so as not to damage the display matrix on the back. Periodically check the heating with your hand - the plastic should become hot, but not melt.
After heating, insert a thin plastic blade or mediator into the joint between the frame and the lid at the bottom of the case. Carefully guide the tool along the perimeter, cutting the adhesive layer. Do not try to sharply bend the lid, since the top of the track is a fingerprint scanner that is easy to tear.
When the perimeter glue is passed, lift the lid. If a fingerprint scanner is installed, it will be attached to the inside of the lid. Carefully unplug the scanner connector from the motherboard if it's connected, or simply remove the lid along with the scanner if the cable allows. In the 7A model, the scanner is often integrated into a module that requires caution.
What to do if the lid is not removed?
If the lid fails to work after heating, do not use force. Add another 30-60 seconds of heating. You can drop a little isopropyl alcohol into the slot - it will dissolve the glue without damaging the plastic. Do not use metal objects deep inside so as not to puncture the battery.> Dismount the protective plate and battery. After removing the back panel, you will see the internal device. Most of the space is occupied by a black plastic lining that covers the battery and the bottom of the board. It is fixed with several screws that need to be unscrewed. First, remove the screws into the battery. First, disconnect the battery plume from the motherboard. Use a plastic blade to hold the connector up. Never pull the wires. You can use a suction cup to extract the battery or gently scoop it with a spatula, trying not to puncture the shell. Component Type of fastening Complexity of Risk Removal Back cover Glue + Latches Medium plastic crack, plume break Screw plate Screws (cross) Low loss of screws Battery Tape High puncture battery fire Motherboard Screws + Trains High Connector Damage Motherboard Removal Motherboard in Redmi 7A It's located at the top of the case, and it's covered with a metal screen and additional plastic locks, and before you remove it, you need to turn off all the plumes that go to the board: the display, the touchscreen, the main and front cameras, and the subboard). Unscrew all the visible screws holding the board. Pay attention to the screws under the Mi logo or in the indentations. Carefully raise the fee by controlling the position of the main camera module, which can project beyond the dimensions of the board. Take the board out of the case, free (camera) from the seat. If you want to replace the speaker or microphone, they can be on the board itself or be carried out to a separate module at the bottom. In this model, the main speaker is often integrated into the lower unit or attached separately, which requires a complete dismantling of the internal components. To replace, disconnect the antenna wire (if it goes through this area) and the plume connecting the lower board to the motherboard. Unscrew the mount screws and remove the module. Install the new board in reverse order. Make sure that the contact areas of the antenna match the contacts on the housing. When assembly, it is important to properly stow the plumes so that they are not clamped by the body. Use original or quality analogues of spare parts, as cheap copies can have offset holes under the screws that complicates the assembly. ⚠️ Attention: The antenna wire is very thin. When it is turned off, pull strictly by the metal connector tip, not by the wire itself, otherwise it will break away from soldering. 7A reverse-sequence. Before the final fixation of the back cover, it is recommended to turn on the smartphone and check all the functions: sound, vibration, camera operation, sensor and charging. This will save time in case of an error (B-7000 Or a special glue for electronics, on the frame of the case, let the glue dry a little (1-2 Then press the back lid gently. Set the device with rubber bands or loads on it. 15-20 Make sure all screws are twisted, and even one screw is not screwed, can cause the shell to creak or get dust inside. After assembly, wipe the screen and the case from the fingerprints. Can I disassemble the Redmi? 7A No hair dryer? Theoretically, you can, but the risk of damage to the back cover or the display increases dramatically. The glue without heating becomes very rigid, and the plastic can crack when you try to pick up. Using a hair dryer is a standard and safe procedure. Which glue is best used for the back cover? The best choice is the glue. B-7000 or T-7000. They stay elastic after drying, which will make future repairs easier, and hold plastic well. Superglue (cyanacrylate) can't be used -- it releases fumes that settle on the camera and glass, spoiling them, and also makes the plastic brittle. What if the phone doesn't turn on after assembly? First of all, check the battery plume connection. Often the connector doesn't get up to the end. Also make sure the display plume is tightly snapped. If the problem persists, one of the components may have been damaged during disassembly. Do I need to remove the SIM card before disassembly? Yes, be sure to remove the tray from SIM-MicroSD and card before any work begins. This will prevent damage to the contacts of the card and the memory card itself during the heating and opening of the case.