Removing the back cover of the Xiaomi Redmi 9A is a challenge that owners face when replacing a battery, repairing plumes or cleaning dust. Despite its apparent simplicity, the process requires care: the plastic body of the model is fastened with latches and glue, and improper actions can lead to cracks or damage to flexible cables. In this article, a step-by-step algorithm with the design of the Redmi 9A, a list of necessary tools and a list of typical mistakes to avoid.
The Redmi 9A is different from other Xiaomi budget smartphones, because it doesn’t have a removable lid (unlike older models like the Redmi 4A), where the body is glued around the perimeter, and the inside is fragile: antenna contacts at the top edge and a fingerprint scanner plume (in the NFC version). If you’ve never taken your smartphone apart, we recommend that you first read the risk section, which will save you time and nerves.
Preparation: tools and modalities
To safely remove the cover of the Redmi 9A, you will need:
- 🔧 Plastic blade (or mediator) to disengage the latches. Metal tools scratch the body!
- 🔥 Dryer or thermo-air station (up to 300 power)°C) softens the glue. Alternative: iOpener (gel bag).
- 🧲 Suction cup (3-4 cm in diameter) - helps to lift the cover after heating.
- 📏 Thin screwdriver (cross, 1.5 mm) - for twisting two screws under the tray SIM-map.
- 🧴 Isopropyl alcohol (90%+) — It removes the glue residue. Don't use acetone!
Work on a flat surface with good lighting. Put a white cloth or napkin on the table to help you notice the screws or details that have fallen out. The room temperature should be at least 18 ° C. The glue becomes more brittle in the cold, and the lid can crack when separated.
Step-by-step instructions: how to remove the cover
Follow the algorithm in strict order. Sequence disruption (e.g., trying to tear off the lid without heating) causes 80% of the time the latches are damaged.
- Turn off your smartphone and remove it. SIM-Screw the screws under the tray (there are two) with a screwdriver and put aside.
- Heat the body with a hair dryer around the perimeter for 2-3 minutes, holding the nozzle at a distance of 5-7 cm Temperature - 70-80°C (touching the body should be hot, but tolerated). Don't direct the airflow to the screen, it will hurt. OLED-matrix (in Redmi) 9A used IPS, But overheating is still dangerous)!
- Suction the suction cup onto the bottom of the lid (near the USB-C connector) and pull up. If the lid fails, repeat heating.
- Scape carefully to the edge, disengage the latches. Start at the bottom corner and move counterclockwise. Redmi 9A has the most trouble areas around the volume buttons and camera.
The body is heated to 70-80°C| Suction suction cup fits tightly | Scapula inserted at an angle of 15-20°| No resistance when the shoulder blade moves-->
If the lid is not fully detached, don't pull it by force, there may be glued areas inside. Reheat the problem area and gently slap it with a spatula. After the complete separation, place the lid on the napkin with the inside side upwards so you don't scratch.
What to do if the lid is cracked?
Common Mistakes and How to Avoid Them
Analysis of service center calls shows that 65% of damages in the Redmi 9A disassembly are due to three errors:
| Mistake. | Effects of consequences | How to avoid |
|---|---|---|
| Heating above 90°C | Deformation of plastic, detachment of antenna contacts | Use a thermometer or heat in short intervals of 30 seconds |
| Separation of the lid from the corner of the camera | Damage to the main chamber plume or flash | Always start at the bottom edge (near USB-C) |
| Use of a knife instead of a shoulder blade | Scratches on the body, cut latches | Use only plastic or wooden tools |
| Strong pulling force | Cracks of the cover or separation of flexible cables | Check the latch separation around the perimeter before removal |
⚠️ Warning: If you see black spots on the battery after removing the lid, stop working immediately! This battery can ignite at the slightest mechanical impact.
What to do after removing the cover
When the lid is separated, the Redmi 9A’s interior design will open to you:
- 🔋 Battery (capacity 5000 mAh) - glued to the body. To replace it, you will need to disconnect the connector and tamper with the battery with a plastic card.
- 📱 Motherboard - closed with metal screen. Unscrew 8 screws (of different lengths!) to access MediaTek Helio chip G25.
- 🎤 The speaker and the microphone are at the bottom, and their plumes are fragile, so don't pull the wires!
If the purpose of disassembly is to replace the battery, consider: the new battery must be original (article MB11016) or certified analogue (eg, Green Cell).
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Before assembly, wipe the battery and motherboard contacts with an alcohol tampon. Contact oxidation is a common cause of charging problems after repair.
Remove: How to Reset the Cover Back
Reverse lids require as much attention as removal.
- Make sure all plumes are connected and the screws are twisted. Check the Volume and Power buttons before the lid is fixed.
- Apply a thin layer of B-7000 glue around the perimeter of the case (don’t overdo it – the excess can get on the motherboard!).
- Line the lid on the USB-C connector and press gently, starting from the center. Use clamps or a heavy book to stick evenly (weight ~1 kg, time 12 hours).
⚠️ Warning: If the smartphone doesn't turn on after assembly, check: Is the battery connector connected (often departs when the lid is installed); Is the power button contacts closed (call the multimeter); Do not try to turn on the device if you smell of burning - this is a sign of short circuit!
Risks of self-disassembly: when it is better to contact the service
Despite the simplicity of the Redmi 9A’s design, some situations require professional intervention.
- 💧 Liquid entry – even after drying, oxides on the board may remain, which will lead to corrosion.
- 🔥 Overheating of the processor – if the smartphone turns off when loaded, the problem may be in the thermal paste (its replacement requires a complete disassembly).
- 📶 Network problems – lack of signal is often associated with damage to antenna contacts under the cover.
The cost of dismantling in the service varies from 800 to 1500₽ (If you are not sure about your skills, compare this amount to the cost of a new Redmi. 9A (~7-9 thousand.₽ Sometimes repairs are more expensive than buying a used device.
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Self-disassembly is only justified when replacing the battery, cleaning from dust or repairing the charging connector. For a diagnosis of the board or recovery after a fall, you should consult a specialist.
Alternative methods: when you do not need to remove the cover
In some cases, the purpose of disassembly can be achieved without completely removing the cover:
- 🔌 Cleaning the connector USB-C: Use toothpick and alcohol. Do not use metal objects!
- 🔊 Speaker problems: often the fault is the mesh, which can be cleaned with compressed air (keyboard cylinder for the keyboard).
- 📱 Resetting: If your smartphone is buggy, try Hard Reset via Recovery (click Volume Up) + Power when the phone is turned off).
If you want to replace the display, you need to remove the lid, but the screen in Redmi 9A is glued to the frame. This will require a special glue tape (for example, Tesa 61395) and heating to 90 ° C. Without experience, it is better to entrust this work to the master.