Xiaomi’s Redmi 9A series is well-deservedly popular for its affordable price and reliability. However, like any electronic device, it’s not immune to mechanical damage, such as a broken screen or battery wear. Self-disassembly can seem like a daunting task for a beginner, but with the right tool and a clear algorithm for actions, this procedure becomes quite feasible even in the home.
In this article, we will take a detailed look at the process of complete disassembly of the Xiaomi Redmi 9A, paying special attention to hidden screws and fragile plumes. It is important to understand that opening the case automatically deprives the device of an official warranty, so before starting work, it is worth weighing all the pros and cons. If you are confident in your abilities and are ready to act carefully, this manual will help you successfully replace damaged components.
The main difficulty when working with budget models Xiaomi often consists in the unusual arrangement of fasteners and use adhesives to fix the display. improper handling of heating elements or excessive effort when disconnecting plumes can lead to irreversible consequences. Careful study of each step before the procedure minimizes risks and saves your time.
Preparation of the workplace and the necessary tool
Before you start dismantling the Redmi 9A, you need to have a comfortable workspace, you need a table with good lighting to distinguish between small parts and screws of different sizes, and the absence of a clutter on the table will not lose microscopic fasteners that can easily get lost in the pile of the carpet or roll to the floor.
To successfully disassemble, you will need a specific set of tools that can be purchased at radio parts stores or online. Using inappropriate items such as kitchen knives or needles is highly undesirable, as they can damage the plastic of the case or damage the insulation of internal components.
The basic set for working with electronics should include:
- 🔧 Screwdriver kit: cross PH000 for the main screws and flat for neat tweaking of elements.
- 🔥 Dryer or heating plate: necessary to soften the glue under the display and back cover.
- 🧲 Magnetic mat or organizer: for sorting screws by disassembly stages, so as not to confuse them during assembly.
- 🧤 Plastic blades and mediators: to open the body without scratches and damage to plumes.
⚠️ Before starting any work, be sure to turn off the smartphone and remove SIM-card and memory card: working with the device on can short circuit and fail the motherboard.
Static electricity can be harmful to chips, so it is recommended to use an antistatic bracelet or periodically touch a grounded metal object. Safety of components is paramount.
☑️ Checking readiness for repair
Removal of the back cover and primary access to the insides
The process of dismantling the Xiaomi Redmi 9A begins with the removal of the rear panel. Unlike the more expensive models, here the back cover is made of plastic and glued around the perimeter, and also fixed screws, which makes the removal process slightly more time-consuming than just snapping latches.
The first thing you need to do is heat the perimeter of the case. Use a hair dryer, evenly warming the edges of the smartphone for 2-3 minutes. The temperature should not be extremely high, so as not to melt the plastic or damage the display on the back. It is enough to warm the case up to a state where it is comfortable to hold in your hand, but it is hot.
Once heated, take a suction cup and place it at the bottom of the back cover, then gently pull it upwards, creating a small gap. Insert a thin plastic mediator or blade into the resulting gap, and as you slid along the perimeter, cut the adhesive layer. Take your time and do not exert excessive effort to prevent the plastic from cracking.
When the adhesive layer is passed around the perimeter, you can remove the back cover, and underneath it you'll see a plastic frame that also blocks access to the battery and the plumes, and at this point, it's important to be careful, because there may be screws hiding under the frame that lock the main modules.
Next, you need to unscrew all the visible screws on the plastic frame. The number can vary, but usually there are about 10-12 pieces. After removing the fastener, carefully raise the frame, starting from the bottom or upper edge, to see if there are any forgotten screws left somewhere.
What to do if the lid is not removed?
Disabling plumes and dismantling the battery
Once you remove the protective frame, you will see the motherboard, the battery and the camera modules, and the first and most important step is to disconnect the battery from the motherboard, which is critical for the safety of future work.
The battery plume in the Redmi 9A is usually connected at the bottom or center of the board and can be closed with an additional metal or plastic bar. Carefully unscrew the slat mount, remove it and disconnect the battery connector, putting it on a plastic blade strictly vertically upwards.
Do not try to pull the plume on the wire or the insulation, this will lead to a break. Use only the connector part. After the power out, you can safely work with other components without fear of short circuit.
To extract the battery, this model, like many modern smartphones, has special tongues for pulling. If they are missing or torn, you can use a thin plastic card or fishing line, passing it under the battery and making sawing movements to separate the adhesive layer.
When installing a new battery, make sure it is securely fixed to double-sided tape.The back of the battery inside the case is not acceptable, as if it falls, this can damage the plume or the battery itself.
Replacement of the display and touch screen
Replacing the screen with the Xiaomi Redmi 9A is one of the most frequent repair procedures. The display module here is a single unit (screen + touchscreen + frame), which makes it easier to replace, but requires care when transferring small parts from the old module.
To remove the display, you must first completely dismantle the motherboard, as the screen plumes pass under it or are attached to its bottom. Unscrew all the screws holding the board, and carefully lift it, first disconnecting all the plumes: the main, side (for buttons), camera plumes and antennas.
Once the board is removed, you can start heating the front of the smartphone, the principle is the same: uniformly warm the perimeter of the screen with a hairdryer. Be careful with the top, where the speaker and the front camera are located, overheating can damage them.
Use a suction cup and mediators to separate the broken screen. Move slowly, cutting the glue. When the screen is removed, clean the frame of the new module or transfer the necessary elements (speaker, vibrator, button plume) from the old screen to the new one.
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Before installing a new display, be sure to check its operability by simply connecting the plumes to the board and turning on the phone, without gluing the module permanently. This will make sure that there are no broken pixels and the touch screen works.
When assembly, make sure all plumes sit tightly in the connectors until the characteristic click.A undressed connector is a common cause of a broken touchscreen or microphone after repair.
Work with charging connectors and side plumes
The bottom of the Redmi 9A smartphone contains a Micro-USB charging connector (some revisions may also have Type-C, but the 9A is characterized by Micro-USB), a microphone and antenna contacts, often this assembly requires replacement due to loosening or oxidation.
The charging connector is usually soldered on a separate board or part of a lower plume, and this model most often uses a modular design, where the connector is mounted on a flexible plume that goes to the motherboard, which makes repairs much easier.
To replace, remove the bottom plastic cap (if any) or part of the frame that covers the bottom. Unscrew the screws that hold the connector board, and disconnect the plume from the motherboard.
It's important to monitor the status of the antenna contacts, which are small spring-loaded contacts or gilded platforms that provide communication, and when you assemble them, make sure they are properly aligned, otherwise the phone may not catch the network well.
The side plumes responsible for the volume and on buttons are also located at the bottom or along the side facet, and they need to be replaced when the buttons stick or there is no tactile response.
| Component | Difficulty replacing | The necessary tool | Risks. |
|---|---|---|---|
| Battery | Medium | Hair dryer, sucker, spatula. | Battery puncture, plume damage |
| Display. | Tall. | Fur, set of screwdrivers, tweezers | A rupture of the plume, a break in the frame. |
| Charging connector | Low. | Screwdriver, tweezers. | Loss of small screws |
| Back cover. | Low. | Fen, mediator | Plastic crack |
Assembly of the device and verification of functionality
The Xiaomi Redmi 9A is assembled in reverse disassembly, but there are some nuances to it. The main rule is not to rush to twist all the screws at once. First install the main components, connect the plumes and check the device in the "open" form.
Turn on the phone, check the touchscreen, the sound of the speakers, the microphone, the vibration and the charging, and if everything is working correctly, you can turn off the device and start the final fixation.
Keep the screws long when you install them. Smartphone cases often use different length screws for different nodes. Swirling a long screw into a hole for a short one can cause a motherboard to break through and fatal damage.
To fix the back cover and display, use a special glue sealant (for example, B-7000) or ready-made adhesive frames (cotch 3M). Apply the glue with a thin layer, let it dry a little (1-2 minutes) before pressing the parts. Excess glue immediately remove with a dry wipe.
Once assembled, allow the glue to be fully polymerized for 2-4 hours before active use of the smartphone, which will ensure the necessary tightness and strength of the connection.
⚠️ Warning: Do not use superglue (cyanacrylate) to fix the lid! it emits fumes that settle on camera lenses and sensors, causing irreversible clouding ("white plaque"), and also makes re-disassembly almost impossible without damage.
Common Mistakes and How to Avoid Them
When repairing the Redmi 9A on their own, beginners often make a number of common mistakes, one of the most common being the damage to the plume when the protective metal screens on the motherboard are not neatly removed, and always check if there are hidden plumes under the metal cover before pulling it up.
Another mistake is ignoring the temperature when working with a hair dryer, which can cause the battery to bloat or deform the plastic elements of the case, making it impossible to fit the lid tightly.
Also, calibration is often overlooked, and after you change the display or the battery, you may need to calibrate the touchscreen or reset the battery statistics, and this is done through an engineering menu or through special applications.
Remember the moisture protection. Once dismantled, the factory moisture protection (if claimed) is completely lost. Be careful with the device in high humidity conditions.
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The most important stage of repair is not the replacement of the part itself, but the quality of diagnosis and proper preparation, which occupy up to 70% of the success of the operation.