Redmi mobile devices have always been famous for their availability and reliability, but even they are not immune to mechanical damage. Xiaomi Redmi 7A is a popular budget model that often gets into repair shops after falls or moisture. Self-disassembly of a smartphone can be a great way to save on the services of a service center, if you have straight hands and a minimum set of tools.
Before you get to work, you need to understand the risks: any careless movement can damage the display matrix or battery. In this article, we will take a detailed look at how to disassemble the Xiaomi Redmi 7A in stages, from removing the back cover to disconnecting the main modules. You do not need to be a professional engineer, but a basic understanding of the electronics device and compliance with safety are necessary for successful completion of the operation.
The main challenge is to have a tight interior arrangement and use adhesives to fix some of the parts. Disassembly requires special suction cups and mediators to keep the plastic from splitting. We'll focus on the nuances of plumes and connectors, because they're the ones most often victimized by inexperienced craftsmen. Get ready for the painstaking work where every step needs to be calibrated.
Tools and workplace preparation required
You can't disassemble your phone properly without the right tools. You don't have to try to replace your screen or battery with just a kitchen knife or a stationery scissors, which is a direct route to damage your device. You'll need a special cell phone repair kit that you can buy from any radio store or marketplace. It's important that all the tools are clean and clean, so you don't put dust inside the case.
Special attention should be paid to the organization of the workspace. The surface of the table should be flat, well-lit and, preferably, not conduct static electricity. Antistatic mat will be an excellent addition, although for one-time repairs you can do with clean dry fabric. All screws and small parts are better to fold immediately into a magnetic tray or numbered containers, since the design of the Redmi 7A uses screws of different lengths.
- 🔧 Set of screwdrivers: mandatory presence of a cross screwdriver PH000 and PH00, and also flat-to-open.
- 🎴 Plastic mediators (scapula): necessary for clipping and screen separation without scratching.
- 🌡️ Hair dryer or heating pad: required to soften the glue holding the back cover and display module.
- 🧲 Magnetic tray or organizer: for systematization of screws of different sizes, so as not to confuse them when assembling.
- 🔋 Suction: Helps to gently lift the back cover after heating the glue.
⚠️ Warning: Before starting any work, be sure to turn off the device. If the battery is swollen or has visible damage, working with it is extremely dangerous - there is a risk of fire.
Don't forget to prepare a light source with good color reproduction to see fine details and plume markings. LED-A lamp or a table lamp will help avoid errors when disconnecting the connectors, and a soft brush should be available to remove dust that will inevitably accumulate inside the case during operation. Proper preparation for repairs takes up to 15% of the time, but ensures the success of the entire operation.
Dismantling of the back cover and side elements
The process of opening the body begins with removal SIM-A tray, which is a standard procedure for all modern smartphones, use a special paper clip or a thin needle to press on the hole next to the end hole, after which the tray will pop out on its own. This action is necessary to ensure access to the screws and prevent damage to internal mechanisms by pressure when heated.
The next step is to heat the perimeter of the back cover. The Redmi 7A back panel is mounted on a double-sided tape that holds very tight at room temperature. Evenly warm the edges of the device with a hairdryer to about 60-70 degrees Celsius for 2-3 minutes. Don't hold the hairdryer too close to melt the plastic or damage the display matrix on the back side.
After heating, insert the suction cup into the bottom of the back cover, closer to the speaker, and slightly pull up, creating a gap. Insert a plastic mediator into the resulting gap and guide it along the perimeter of the case, cutting the adhesive layer. Movements should be smooth, without jerks, so that the cover itself does not crack. Be especially careful in the area of the camera module and fingerprint scanner, if it is present in your modification.
- 🔥 Heat the cover gradually, checking the temperature with your finger so as not to burn and overheat the device.
- 🚫 Do not use metal blades to open – they can damage the battery or plumes under the lid.
- 🔄 Move around in a circle, gradually deepening the mediator, rather than trying to remove the lid on one side.
When the glue is cut all around the perimeter, the back cover will easily be removed, and underneath it you will see a plastic frame covering most of the components, and the battery. At this point, it is important not to pull the lid sharply, as it may be glued to the fingerprint scanner plume (in some versions) or antenna contacts. Carefully put the lid aside and inspect the insides for visible damage or oxidation.
Removal of the protective framework and access to the motherboard
Under the back cover, there's a large plastic frame that acts as a frame and protects the interiors, and it's mounted with a lot of screws around the perimeter and in the center. Unscrew all the visible screws using a screwdriver of the right size. Note that some screws may be hidden under stickers or rubber plugs, so check the frame surface carefully.
Once the fasteners are removed, the frame must be carefully lifted, held on plastic latches that break easily when handled carelessly. Use a mediator to walk through the frame and snap the locks. Redmi 7A's plastic body is flexible enough, but the fragile mounting elements require a delicate approach. Don't use excessive force if the frame is not removed - check if all screws are twisted.
⚠️ Attention: There are plumes under the frame that connect the lower board to the main board. Abruptly removing the frame can cause these plumes to break, which will require their replacement.
Once the frame is removed, the motherboard, battery and camera modules will be accessed, and at this point, it is recommended to disconnect the battery plume from the board to completely power out the device, which will protect the electronics from short circuit during further disassembly. The battery connector is usually located at the top of the board and has a characteristic shape, it must be slapped with a plastic blade strictly vertically upward.
☑️ Check before charge is withdrawn
Removal of the battery and replacement of the display module
Battery replacement in the Redmi 7A is often required due to natural wear or bloating of the battery.The battery compartment is filled with glue, so it will require heating again to extract the old battery.Watching the battery area with a hairdryer through the back (if only the frame is removed) or directly if the body is disassembled.Use a plastic card or special tape with adhesive layer to tuck the battery in and pull it out of the niche.
When installing a new battery, make sure the contact pad is clean and the power supply is securely fixed. Use a special B-7000 glue or double-sided tape to fix it, but don't overdo it with the amount of glue. The new battery should sit tightly in its bed and not hang around when shaken. After installation, plug the power plume into the characteristic click.
If your goal was to replace the screen, then after removing the frame and turning off the battery, you need to dismantle the old matrix. The screen in Redmi 7A usually comes with a frame (module), which makes it easier to replace. Unscrew the screws that hold the module and carefully separate it from the body. When installing the new module, check the touchscreen and images before final assembly and sealing.
| Component | Difficulty replacing | The necessary tool | Risks. |
|---|---|---|---|
| Battery | Medium | Hair dryer, sucker, spatula. | Battery puncture, plume damage |
| Screen (module) | Low. | Screwdriver, mediator. | Breaking a new screen when installing |
| Back cover. | Low. | Fryer, sucker. | Plastic cracks, chipped |
| Lower fees | Medium | Setting screwdrivers | Loss of screws, damage to microphone |
What to do if the battery is not removed?
Working with motherboard and cameras
The motherboard is being dismantled to replace charging connectors, microphones or major electronics repairs, and it's mounted with multiple screws and covered with metal screens that also need to be unscrewed, and underneath the screens are connectors of the display plumes, touchscreens, cameras and main plumes, all of which need to be carefully detached using a plastic blade.
The main camera and the front camera are attached to their seats and are connected with flexible plumes. When removing camera modules, be extremely careful: the camera lenses are very sensitive to dust and fat spots. Do not touch the glass surface with your fingers. If the camera is stuck, sway it slightly from side to side, but do not pull the plume, as it can break at the base of the connector.
When you reverse-mount the board, make sure that all the shielding plates are returned to their places. Not only do they protect against interference, but they also participate in the removal of heat from the processor. The heat sink in budget smartphones is implemented through contact of metal screens with the case or special heat pads. The absence of screens can lead to overheating of the device and unstable operation.
- 📷 Remove camera modules by holding onto the module’s metal body, not the plume.
- 🔌 Turn off the plumes strictly perpendicular to the plane of the board, so as not to break the contacts.
- 🧹 Before assembly, blow the insides with compressed air to remove dust.
💡
Use tweezers with curved ends to work in hard-to-reach places, but never use them to tweak plumes - only plastic!
Assembly of the device and verification of functionality
The Xiaomi Redmi 7A is assembled in reverse order, but requires even more care. Make sure that all the plumes are snapped to the end and fixed with clamping slats. Checking the connections before twisting the screws will avoid a situation where the assembled device does not turn on. Pay special attention to the display plume and touchscreen - they must lie flat, without clamps.
Before the final installation of the back cover, it is recommended to test the battery, press the power button and check the display, sound, vibration, cameras and fingerprint sensor. If everything works correctly, you can apply new glue to the frame of the case and press the back cover. The B-7000 glue will dry for about 24 hours, so at this time it is better not to load and lock with rubber bands.
The final stage includes installation SIM-Check the antenna contacts are pressed correctly, otherwise there may be problems with the signal level of Wi-Fi and mobile network. If after assembly you notice gaps between the case and the screen or the lid luftite, then the assembly is incorrect and requires redisassembly to eliminate defects.
⚠️ Warning: Do not turn on the device if you are sure that some screw is left over. This may indicate that you forgot to screw an important part, which will lead to a short circuit.
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Quality assembly is more important than speed: it is better to spend an extra 15 minutes checking all connections than to reassemble the device because of a broken microphone.