How to open Xiaomi Redmi 7A: full disassembly instructions

Redmi series smartphones have long proven themselves as reliable workhorses, but even the most durable equipment is not immune to mechanical damage. Owners of the Redmi 7A model often face the need to replace a broken display or a bloated battery, and they face the question of how to safely open the device.

The dismantling process requires not only accuracy, but also an understanding of the internal architecture of the smartphone. Unlike flagship models with waterproofing, budget devices like the Xiaomi Redmi 7A are assembled mainly on plastic latches and screws, which makes it somewhat easier. However, careless handling of plumes or improper effort when cracking the case can lead to irreversible consequences.

Before you start, you need to evaluate your skills and prepare your workplace. Good lighting and no dust are key to success, because even a small villi under the display will spoil the appearance of the device. Next, we will look at the steps of the autopsy, the necessary tools and the typical mistakes that should be avoided.

Tools and workplace preparation required

To perform the job of dismantling Redmi 7A standard set of screwdrivers may not be enough. You need specialized tools that will provide access to the internal components without damaging the plastic elements of the case. Lack of the right tool often leads to failure of screw threads or break latches.

Special attention should be paid to tools for working with adhesives. The back cover of the smartphone is attached to double-sided tape, which requires heating to soften. The use of household hair dryers is inefficient, because they do not give the desired temperature, and the soldering station can overheat the plastic.

• 🔧 Precision screwdrivers (cross-haired) PH000 and flat) - for twisting the screws of the board and the dynamic module.
• 🧤 Thin plastic blade or mediator - for snapping the body without scratches.
• 🌡️ Thermophen or hot water heater for smartphones - to heat glue under the back cover.
• 📦 Tweezers with dielectric tips - for safe extraction of plumes.

Prepare the screw sorting containers, because Xiaomi uses different lengths of fasteners, and if you mix them up when you build them, you can damage the internal components or you can't get into the threads, which will break the plastic. Organise the space so that all the parts are on hand.

Removal of the Redmi 7A back cover

The first step in any disassembly is to remove the back panel, which in the Redmi 7A is made of plastic. Despite its apparent simplicity, this step requires patience, since the adhesive layer around the perimeter of the device can be quite rigid, you only need to start working after you make sure that the device is completely turned off.

Heat the perimeter of the back cover with a thermophen or put the phone on the heating pad. The temperature should not exceed 80-90 degrees Celsius, so as not to deform the plastic. Keep the device heated for about 2-3 minutes, periodically checking the softening of the glue with your finger.

⚠️ Warning: Do not heat the central part of the back cover where the logo and camera are located. Local overheating in this area can damage the camera matrix or cause battery bloating.

After warming up, insert a thin plastic card or spatula into the gap between the frame and the lid, usually in the area of the charging connector or volume button. Carefully guide the tool along the perimeter, trying not to plunge it deep inside, so as not to touch the plume of the fingerprint scanner.

When the glue at the edges is overcome, lift the lid slightly. Don't pull it up sharply, as a plume may be glued to it. In the Redmi 7A, the fingerprint scanner is located on the back and connected to the motherboard with a small connector.

• 🔥 Evenly warm the edges, moving the hair dryer in a circle.
• 🛑 Do not use metal blades to slash the lid - this will lead to chips.
• 👐 Act slowly, listening to the sound of peeling off scotch.

Dismantling internal components and protection of boards

After successfully removing the back cover, you will see the interior of the smartphone. The main board of the Xiaomi Redmi 7A is closed with a black plastic cover that performs a protective function and shielding, and underneath it are hidden battery connectors, display and other important nodes.

To access the board, you need to twist out a few screws that hold the protective cover, usually about 10-12 pieces, and they can be of different lengths, and it is recommended that you immediately after you twist each screw, mark its location on the circuit or arrange it in cells in the order in which they were removed.

When you take off the plastic protection, you'll see the connectors that the plumes are connected to, and the first thing you need to do is turn off the battery to shut down the device and avoid short circuits, and use a plastic blade or finger to gently snap the battery connector off the motherboard.

Then you can disconnect the other plumes: the display, touchscreen, main and front camera modules, and the bottom plume with charging connectors. Be extremely careful with the display plume, as it is very thin and easily breaks when you carelessly handle.

If your goal is to replace the battery, you need to remove the plume from the niche after you turn off the battery. In Redmi 7A, the battery is planted on double-sided tape. Use a plastic card to extract it, gently slip it under the battery and make sawing movements.

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Before turning off any plume in your smartphone, always turn off the battery first, which will prevent a power surge that can disable the power controller or screen lights.

Replacement of the display and touch screen

Replacing the screen in the Redmi 7A is the most common reason for disassembly, and the display module in this model is glued to a plastic frame, which in turn is attached to the body, and there are two ways: replacing the module with the frame (which is easier) or gluing the glass to the old frame.

If you change the module with the frame, the process is simplified. After disconnecting all the plumes from the motherboard, you need to unscrew the screws holding the dynamic module (sniffles) and remove it. Then the screws are unscrewed along the perimeter of the frame, and the screen is separated from the body.

When gluing the glass to the home frame, you will need to heat the front. Put the phone up on the heating pad and heat for about 5-7 minutes. Then, with a thin line or a special knife, carefully cut off the old broken screen, swiping the tool between the glass and the frame.

⚠️ Warning: When cutting an old screen with a line, be careful with the touchscreen plume that runs along the edge.It is very easy to cut, which will make the new screen inoperable immediately after installation.

After cleaning the frame of the glue residue and degreasing the surface, apply a new layer of special glue B-7000 or use a ready-made adhesive layer. Install a new module, press it tightly and lock it with gums until the glue is completely dry (usually 1-2 hours).

• 💧 Use the glue. B-7000 securely.
• 🧹 Carefully remove old glue residues before installing a new screen.
• ⏳ Allow the glue to dry under load (rubber) for at least 60 minutes.

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The quality of the screen replacement depends on the purity of the frame surface and the uniformity of the application of the glue, even a small speck of dust will create a gap through which moisture and dirt will later enter.

Assembly of the device and verification of functionality

The Xiaomi Redmi 7A is assembled in reverse disassembly order, but before you twist all the screws and glue the back cover, you need to conduct an initial health check of all the replaced nodes, which will save time in the event of a defect or connection error.

Connect the display, touchscreen and battery plumes to the motherboard. Turn on the device while holding the power button. If the screen catches fire, check the sensor by opening any aplikasi or settings menu. Make sure the speakers, microphone and vibrator are working.

Check the cameras by taking a few pictures on the front and main camera, and check the fingerprint scanner if it was taken during disassembly, and make sure that the proximity sensor works correctly (the screen goes out when you bring the phone to your ear).

Only after successful testing can you start the final assembly: put all the plumes in your channels so that they are not clamped, twist all the screws, respecting their length and location, glue the back cover, pre-fat the ends of the body with alcohol.

It's important not to pull over the screws, especially those that attach the plastic board protection and the display frame. Excessive force can lead to cracks in the plastic, which will make the structure less durable.

Typical errors and precautions

Self-repairing electronics always comes with risks, and the Redmi 7A is no exception. Beginners often make mistakes that can turn a simple repair into a complete replacement for the device.

One of the most common mistakes is to ignore the battery shutdown before working with other plumes, and even short-term closure of the contacts can burn the power circuits on the motherboard, and always follow the rule: "Battery first, everything else then."

Another common problem is the loss or entanglement of screws. At Xiaomi, screws can vary by fractions of a millimeter in length, but that's enough to screw a long screw into a short hole to punch a board or damage the case. Keep a journal or use a magnetic mat with markup.

⚠️ Warning: Never use metal tools (needles, scissors) to pick inside a smartphone that is powered on or connected to a battery.The metal conducts current and can short-circuit that will instantly disable the device.

And also, the risk of damage to plumes is that they're very thin and sensitive to clogs, if the plume has traces of cracks or ruptures, it needs to be replaced, and when you try to straighten or glue the plume with tape, it usually doesn't work long term.

• 🚫 Don’t ignore electrical safety rules when working with a battery.
• 🔍 Check each step carefully before serving food.
• 🛠️ Use only a quality tool that is suitable in size.

Disassembling and repairing Xiaomi Redmi 7A is a process that requires care and calm. Following the instructions and following precautions, you can successfully replace damaged components and prolong the life of your gadget.