Disassembling a modern smartphone is always a balance between repairing and damaging fragile components. Xiaomi Redmi 9A (codename dandelion) is one of the most popular budget devices, but its design has its own features that require careful attention. Unlike flagship models, it uses a plastic back cover that is exclusively glue-based, which makes it easier to access the insides, but requires accuracy when heated.
Before you start dismantling, you need to clearly understand the purpose of your intervention, whether it's replacing a broken display, installing a new battery, or cleaning the speaker from dust, properly preparing the workplace is crucial. Lack of preparation often leads to damage to the plumes or even a puncture of the battery, which can be dangerous.
In this article, we will take a detailed look at the process of opening the case, disabling all the necessary plumes and getting to the main nodes of the device. Carefully study each step to avoid the typical mistakes made by beginners when first familiar with the design of smartphones in this series.
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Before starting work, be sure to back up all important data, as the repair process may require a complete battery shutdown, which sometimes results in resetting settings or losing unwritten changes.
Tools and workplace preparation
You can't do a good job of disassembling without the right tools. You don't need a suitcase full of professional equipment, but a basic set is a must, and the main tool is a dryer (industrial or household at maximum temperature) that you need to soften the glue under the back cover.
A set of plastic mediators (scapula) and a suction cup will also be required. Metal tools such as knives or scalpels are best set aside or used with extreme caution only for tingling the frames, as the plastic of the Redmi 9A body is easily scratched and can crack when subjected to heavy mechanical stress.
- 🔧 Screwdrivers (Cross Phillips #000 and #00).
- 🔥 Hair dryer.
- 📱 Plastic shoulder blades and suction cups.
- 🧲 Magnetic screw mat.
- 🧤 Antistatic gloves (optional).
Organize your workspace so that light falls evenly and fine details don't get lost. The screws in modern smartphones can be of different sizes, and confusing them means risking breaking the board or damaging the thread. The most critical thing is to turn off the battery before touching any other plumes to avoid short circuit.
☑️ Preparation for disassembly
Removal of the back cover and primary access
The process begins with heating the perimeter of the device. Turn on the hair dryer and evenly warm the back cover around the perimeter for 2-3 minutes. The temperature should not be extreme so as not to melt the plastic, but sufficient to soften the adhesive layer. You can check the readiness with your finger: the plastic should become hot, but tolerant to touch.
Once heated, place the suction cup at the bottom of the back cover, closer to the center, but not too close to the edge. Pull the suction cup up, creating a small gap between the lid and the frame. Insert a thin plastic blade gently into this gap. Don't try to pull the lid off immediately with a jerk -- that's a surefire way to damage the plume of a fingerprint scanner or speaker.
⚠️ Warning: Do not insert the blade too deep into the top of the smartphone, where the camera module is located.
Swipe the blade around the perimeter, gradually snapping the clips and cutting the glue. Pay special attention to the corners, because there the glue often holds tighter. When the lid is fully separated, remove it and put it in a safe place, you will have access to the internal components closed by the plastic protective panel.
Dismantling the protective panel and disconnecting the plumes
The interior of the Xiaomi Redmi 9A is protected by a plastic pad that covers the battery, motherboard and bottom board. It is attached to many screws of different sizes. You'll need a cross screwdriver to unscrew all the visible fasteners. Some screws can be hidden under stickers or rubber plugs, although in this model their arrangement is quite standard.
Once all the screws are removed, gently tuck the panel into a plastic blade, which can sit tightly because of the glue, so act slowly. Once you remove the protection, you'll see the main nodes. The first thing you need to do is to disconnect the battery plume from the motherboard, which is a critical step for safety.
Use a plastic blade or nail to hold the battery connector up. Don't pull the wires! After the power out, you can disconnect the other plumes: the display, the touchscreen, the main cameras and the auxiliary modules. For convenience, remember the location of each connector or take photos at each stage.
| Component | Location. | Type of attachment | Features |
|---|---|---|---|
| Battery | Central part | Glue base + connector | Requires careful unhooking |
| Maternity fee | Upper part | Screws + plumes | Many small screws |
| Lower fees | Bottom of the hull | Screws + plume | There's a charging jack. |
| Display module | The front | Glue + frame | Fragile, afraid of pressure |
Removal of the battery and replacement of components
The battery in the Redmi 9A is glued to the body quite firmly, you can't just pull it out by the tongue if the device has been in use for a long time, and the best way to extract it is to use medical alcohol (isopropyl) and a thin line or a special map.
Put a few drops of alcohol under the edges of the battery and wait a few minutes for the liquid to penetrate the glue layer. Then carefully, without jerking, saw the glue with a line, moving it from side to side. Do not use metal objects so as not to puncture the battery case, this will cause fire.
- 🔋 Clean the glue residue from the case before installing the new battery.
- 🧪 Use double-sided scotch or special glue B-7000 fixative.
- 🔌 Check the voltage of the new battery before connecting.
- 🧹 Clean the connectors' contacts with alcohol.
When installing a new battery, make sure it fits tightly to the body and does not hang. Connect the plume to the characteristic click. If you change other components, such as the bottom board with the charging connector, make sure that the antenna contacts (springs) match the response parts on the body.
What to do if the battery is blown?
Removal of the display module and frames
If your goal was to replace the screen, then once you remove the back cover and turn off the plumes, you need to dismantle the module itself. In the Xiaomi Redmi 9A, the screen often changes with the frame, which makes it much easier. However, if you change only the glass or matrix, the process becomes more complicated.
To remove the framed module, you need to twist all the screws around the perimeter and gently snap the plastic latches. There may also be glue here. In this case, you need to heat it from the display side, but very carefully so that you don't damage the matrix by overheating.
⚠️ Attention: Pressure on the center of the screen during disassembly can lead to black spots or stripes on the matrix.
When assembling a new module, make sure that the touchscreen and display plume are properly stacked in the channels and not squeezed. Any twisting of the plume can lead to incorrect sensor operation or the appearance of artifacts in the image.
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Replacing the screen assembled with a frame is the most reliable option for repair, since it eliminates problems with glue and body geometry, maintaining factory tightness (as much as possible).
Assembly of the device and verification of functionality
The assembly is done in reverse order, but requires even more care. First, put all the internal components in their places, make sure that nothing prevents the safety panel from closing. Twisting all the screws, but do not drag them, so as not to break the thread in the plastic racks.
Put the battery in the last place before you put the back cover on. Turn on your phone and check all the functions: sound, vibration, camera, touch screen, microphone and speakers. Make sure that Wi-Fi and Bluetooth are stable, as antennas may have been misaligned.
Only after a successful test can you apply the glue to the back cover and fix it, spread the glue evenly around the perimeter, press the lid and lock the device with gums for 15-20 minutes to polymerize the glue. Don't turn the phone on immediately, let the glue grab.
What if the phone doesn’t turn on after assembly?
Can I use glue instead of the original scotch?
Do I need to reset the settings after replacing the parts?
Properly executed disassembly and assembly of Xiaomi Redmi 9A will prolong the life of your device and save money on the services of the service center. The main thing is not to rush and follow the instructions, respecting the fragile electronic stuffing of a modern gadget.
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Use a magnetic mat or a piece of paper with painted cells to spread the screws in the order in which you twisted them, which will save you a lot of time and nerves when you build them.