Budget smartphones like the Redmi 9A are often the victims of mechanical damage due to affordable price and heavy usage. A broken screen, a swollen battery or a failed speaker are typical problems that can be solved on their own with a minimum set of tools. However, before starting to dismantle, you need to be clear about the risks: inept actions can lead to final failure of the device or loss of warranty.
The process of disassembling this model has its own peculiarities related to the design of the case and the location of the plumes. Unlike more expensive models, there are no protective screens on the board, but there are many small screws and fragile connectors. You will need patience, quality lighting and accuracy, so as not to damage the display matrix when opening the case.
In this article, we will take a look at every step from power outage to replacement of the main components, and we will look at the tools, procedures and common mistakes that beginners make, and if you are willing to act carefully, you can save a significant amount of money on the services of the service center.
Tools and workplace preparation required
Quality preparation is the key to successful repairs. To disassemble the Xiaomi Redmi 9A, you will need a specific set of tools that you will not always find in a regular kitchen. Using inappropriate items such as knives or thick screwdrivers is almost guaranteed to damage plastic latches or chipped glass.
First of all, get a set of precision screwdrivers. You'll need a PH000 or PH00 cross screwdriver to twist the main screws of the case. Also extremely useful will be a flat screwdriver or plastic shovel (mediator) to snap clips. Metal tools at the rear window use with utmost care.
- 🔧 A set of precision screwdrivers (cross and flat)
- 🔥 Hair dryer or heating pad for heating the adhesive layer
- 💳 Plastic card or mediator for opening
- 🧲 Magnetic mat or organizer for screws
Don't forget to prepare the workspace. The surface should be clean, flat and well-lit. It's recommended to use an antistatic mat, although for budget repairs, dry clean fabric is often enough. Organize the space so that small parts don't roll under the furniture.
⚠️ Warning: Before starting work, be sure to turn off your smartphone. If the device does not respond to the power button, wait for the battery to completely discharge to minimize the risk of short circuit when disconnecting the plumes.
Removal of the back cover and primary access
The Redmi 9A's back is made of plastic, but it's mounted on a fairly strong double-sided tape around the perimeter. You can't just pick it off, you need preheating. Use a hair dryer by warming the perimeter of the body for 2-3 minutes. The temperature should not be extreme, 70-80 degrees Celsius is enough for the glue to soften, but the plastic doesn't deform.
After heating, insert a plastic card or mediator into the joint between the back cover and the frame at the bottom corner. Move the tool along the perimeter, gradually cutting the adhesive layer. Don't try to tamper with the lid on one side at once, which can lead to cracks. Move smoothly, feeling the resistance of the adhesive.
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If the back cover is too tight, do not use force. Reheat the problem area with a hairdryer for 30-40 seconds to avoid breaking the plastic racks under the screws.
When the lid is completely detached, put it in a safe place, and you'll have access to the insides: the battery, the main board, and the camera module, and notice the location of the screws, and the number and type of screws may vary depending on the board revision.
Dismantling of protective elements and battery
Inside the case, you'll see a plastic frame covering the main board and the plumes, which is secured by several screws, carefully unscrew all the visible screws using a magnetic sorting mat, and after removing the screws, remove the plastic lining, trying not to touch the plumes that may be glued to it.
The most important step is to turn off the battery. The battery plume is under the protective bar or directly on the board. Use a plastic blade or nail to gently snap the connector. Never use metal tools for this operation, as a breakdown of the contacts can instantly disable the power controller.
| Component | Type of attachment | Tool. | Risk of damage |
|---|---|---|---|
| Back cover. | Sticky layer | Fen, mediator | Plastic cracks |
| Protective bar. | Screws. | Screwdriver PH00 | Carving failure |
| Battery | Connector + Clay | Scapula, sucker. | Battery puncture |
| Camera module | Clamp/Glue | Tweezers | Lens damage. |
To extract the battery itself, which is also planted on glue, use a suction cup or special tapes. Tap the battery on the bottom edge and slowly pull, helping the plastic card to slip it under the battery body. If the battery is swelling, be extremely careful - any puncture can cause ignition.
Replacement of the screen and display module
If your goal was to replace a broken screen, then after removing the back cover and turning off the battery, the task is simplified. The screen in the Xiaomi Redmi 9A is mounted perimeter to the glue and is fixed by screws at the bottom (under the speaker).
To do this, you need to unscrew the screws that hold the bottom of the frame (near the charging connector), and carefully separate the main unit from the front panel. The display plume is connected to the bottom of the motherboard. Disconnect it by bent the locking plate if there is one, and remove the old module.
- 📱 Carefully warm up the perimeter of the old screen for easy removal
- 🧹 Carefully clean the frame of the remnants of old glue before installing a new one
- 🔌 Check the new plume for the presence of clogs before connecting
- 🧪 Before the final assembly, perform a test turn on
The new screen is set in reverse order. Apply a thin layer of special B-7000 glue or use pre-painted tape (if it comes with it). Make sure the plume is inserted to the point and fixed. Any shift can lead to stripes on the screen or no image.
⚠️ Warning: When installing a new display, do not press the center of the matrix. Only press the edges of the frame to avoid black spots or broken pixels.
Working with connectors and small components
Often, disassembly is required to replace the bottom plume with the charging connector, since it is the "consumable material" of budget smartphones. The connector is at the bottom of the case. To get to it, you need to remove the speaker, which is usually glued or pinned with screws.
Carefully unplug the speaker with a spatula, and underneath it you'll see the plume going to the board and the connector itself. The replacement of the plume is simple: unplug the connector from the board, remove the old plume from the seat, and insert a new one. Make sure the contact pads are clean.
Why does the smartphone not see charging after replacement?
You can also use the main camera module when you disassemble, which is held in a separate well. Just pull the module up by snapping the plume. Rub the lenses with soft cloth -- often the soapy photos are caused by mud inside the body, not by a breakdown in the matrix.
Assembly of the device and verification of functionality
The Xiaomi Redmi 9A is built in the exact opposite order. Start by installing the battery and connecting it to the board. Only then you can check the health: press the on button. If the phone vibrates and the screen lights up, you're on the right track.
Check all the functions: touchscreen, speaker sound, microphone (record recorder), cameras and proximity sensors. If everything works, you can start the final fixation. Apply new glue on the perimeter of the back cover or use double-sided tape.
☑️ Final check before closing
Press the back cover around the perimeter and lock the smartphone with money bands for 15-20 minutes until the glue catches. Don't turn the phone on immediately after assembly, let the materials cool and fix. This will ensure tightness and dust protection.
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The quality of the glue and the accuracy of its application determines whether the smartphone will be protected from moisture and dust after repair.