How to disassemble Xiaomi 9A: detailed instructions with photos and nuances

Xiaomi Redmi 9A (codenamed dandelion) is one of the brand’s most popular budget models, released in 2020. Despite its simplicity of design, its disassembly requires accuracy: the fragile battery plume, glue fixation of the rear cover and the risk of damage to flexible cables make the process non-trivial for beginners. This article will help to disassemble the device without damage, whether it is battery replacement, dynamics or repair of the charging connector.

We will take a detailed look at each step, from tool preparation to back-assembly, highlight the unique features of this particular model (such as the location of the latches under the lid), and warn of typical errors that lead to a break in the display or loss of leakage. If you have never disassembled a smartphone before, start by reading the section on the necessary tools - without them, the risk of damaging the Redmi 9A increases significantly.

Preparation: Tools and precautions

Before you start disassembling, make sure you have everything you need. Xiaomi 9A does not require professional equipment, but you can not do without specialized tools.

• 🔧 Plastic mediators or shoulder blades (thickness 0.1–0.2 mm) – for separation of the back cover.
• 🔨 The screwdriver. PH00 (magnetic) - for screws inside the housing.
• 🔋 Suction cup (diameter 5-7 cm) - will help to lift the cover after heating.
• 🔥 Hair dryer or thermoplatform - for softening the glue (temperature 60-80)°C).
• 🧲 Magnetic mat or container – so as not to lose screws.
• 📱 Tweezers – for working with plumes and small details.

⚠️ Warning: Do not use metal blades or knives, they will scratch the body and can damage the plumes. Also avoid overheating: if the glue does not respond, it is better to repeat the heating than to increase the temperature above 90°C (this is the risk of plastic deformation).

Before disassembling, be sure to turn off the smartphone and remove SIM-If the battery is swelling, don't try to disassemble the device yourself, go to the service center.

Removal of the back cover: technique and nuances

The Redmi 9A's back cover is glued around the perimeter and also latched, and the main challenge is not to damage the fingerprint scanner plume (if you have one in your version) or leave any traces of the tools on the plastic.

1. Heat the back cover with a hair dryer for 2-3 minutes, evenly driving around the perimeter. Do not stay in one place for longer than 10 seconds.
2. Apply the suction cup to the bottom of the body (near the charging connector) and pull up slightly. If the lid fails, repeat the heating.
3. Insert a plastic mediator into the gap and carefully guide it along the edge, separating the glue. Start at the bottom and move counterclockwise.
4. Pay special attention to the areas around the camera and the top, where the latches are. Don't force if the lid doesn't move away, you better warm up the problem area again.

💡 If the lid is raised but not removed completely, check if there are any remaining undetached areas of glue. Don't try to tear it off - it can damage the plumes.

Once you remove the lid, you'll see the battery, the motherboard, and a few plumes. Don't touch the contacts with your hands, static electricity can damage the components. If you're disassembling the battery replacement device, follow the next section. If the goal is to repair other components, disconnect the battery first.

Battery shutdown: why it's critical

The battery in Xiaomi 9A is connected to the motherboard with a flexible plume with a JST 1.0 connector, which must be disconnected first, which will prevent short circuits during further disassembly, neglecting this step can lead to failure of the power controller or even fire.

To turn off the battery:

1. Carefully tuck the black battery plume connector into a plastic blade. Don't pull the plume itself, it could tear it!
2. Unplug the connector by pulling it upwards (perpendicular to the board). Make sure the contacts are not closed together.
3. Secure the plume with tape or put it to the side so that it does not interfere with further work.

⚠️ Attention: If the battery is swelling (as seen by the deformation of the cover or the characteristic "slapping" sound when pressed), do not try to remove it yourself. Bloated cells can explode when punctured or bending strongly.

Once the battery is turned off, you can start disassembling other components. If you want to replace the battery, move to the section on retrieval. To repair the display, speaker, or charging connector, you first need to remove the motherboard.

Extraction of the motherboard: screws and plumes

The Redmi 9A motherboard is mounted on 10 screws and connected to the body with multiple plumes, and their location and sequence of shutdowns are critical — if you do this wrong, you can damage the connectors.

1. Unscrew all the screws marked in the photo below (use a magnetic screwdriver to keep them from getting lost). Rotors of different lengths - remember where you were.
2. Disconnect the plumes in this order: Display plume (top connector, fixed by the latch); Touchpad plume (near the display, thinner); Camera plume (top left corner of the board); Power button plume (top right corner).
3. Carefully raise the charge over the edge, don't pull the components. If it doesn't yield, check if all the screws are unscrewed.

📌 Key conclusion: Display plume is the most fragile element in Xiaomi 9A. It's going to break down and it's going to be 30 to 50 percent of the cost of replacing the phone, so always disconnect it last and lock the plug before you take it out.

Once you've removed the board, you'll have access to all the internal components: the speaker, the vibrator, the charging connector and the antenna modules. If you're disassembling your phone to clean your dust, use a soft brush and a compressed air balloon, don't blow your mouth to keep saliva out.

Replacement of the battery: step-by-step instructions

The battery in Xiaomi 9A has a capacity of 5000 mAh and soldered to the body with double-sided tape. To replace it, you will need a new battery (article: MB11 or BQ-5010) and adhesive tape for fixation.

1. After the battery plume is turned off (see previous section), gently pull the tongue under the battery. If it is not, apply a plastic blade to the side of the battery.
2. If the battery is glued heavily, warm it up with a hair dryer (maximum 60°C) and slap it with a spatula. Do not use metal tools - risk puncture of the battery!
3. Remove the remnants of old tape from the case. Rub the surface with alcohol for degreasing.
4. Stick the new battery onto a double-sided tape (included) and plug the plume into the board. Make sure the connector is latched.

⚠️ Note: After replacing the Xiaomi battery 9A It may show an incorrect charge level in the first 2-3 charge/discharge cycles. This is normal - the controller needs time to calibrate. If the problem persists longer, check the density of the plume or update the firmware.

If the new battery does not hold a charge (discharges in a few hours), there are two possible reasons:

• 🔋 Battery defective (check the voltage with a multimeter - it should be) ~3.7–4.2B).
• 📱 Problems with the power controller on the motherboard (diagnosis required).

Disassembly of the screen and replacement of the display

The Redmi 9A is a single module that includes a touchpad, a matrix and a frame, and it requires special care to replace it: the display plume is thinner than paper, and the connector is fixed by a fragile latch. If the screen cracks or stops responding to touch, follow the instructions:

1. Remove the back cover and turn off the battery (see previous sections).
2. Unscrew 4 screws that fix the metal frame of the display (located in the corners).
3. Heat the screen edge (70°C) with a hair dryer for 1-2 minutes to soften the glue.
4. Insert a plastic blade between the frame and the body, and carefully separate the display as you move around the perimeter. Don't force it -- if the screen doesn't respond, warm it up again.
5. Disconnect the display plume from the motherboard (the latch opens up).

💡 Useful tip: When installing a new display, make sure that the plume does not overflex. The optimal bend radius is at least 5 mm. If the plume is squeezed, over time, dead zones will appear on the screen.

The cost of the original display for Xiaomi 9A is about 3-5 thousand rubles, analogues - 1.5-2.5 thousand rubles. When buying, check whether the set is glue for fixation. If not, use double-sided tape 3M 467 or 3M 468.

💡

If the display flashes or displays artifacts after you change the display, check the density of the plume to the connector. Often the problem is solved by reconnecting.

Phone Assembly: Reverse Sequence and Testing

The Redmi 9A should be assembled in reverse order, and here are the key points to consider:

1. Make sure all the plumes are tightly connected and the plug latches are closed, especially the battery plume and the display.
2. Check whether there are any foreign objects inside the case (screws, scotch clippings, etc.).
3. Stick the back cover onto a new double-sided scotch or use a B-7000 glue (a thin layer around the perimeter).
4. Twisting all the screws, but don't pull over - it can damage the thread.

After assembly, turn on the phone and check:

• 📞 Does the sensor and display work (are there no dead zones").
• 🔋 Is the battery charged (plug the charger in).
• 🎵 Whether the speaker and microphone are working (make a test call).
• 📶 Does the network catch (check the signal indicator).

If something doesn’t work, take the phone apart and check:

• Connecting plumes (especially the display and antenna modules).
• Integrity of contacts on the motherboard (is there oxidation).
• Correct installation SIM-cards (sometimes they fall out when assembled).

⚠️ Warning: If the phone doesn't turn on after assembly, but when you connect to charging, the charging indicator shows, the problem may be the power button or its plume.

Frequent Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when disassembling the Xiaomi 9A. Here are the most common of them and ways to prevent them:

If you make one of these mistakes, don't panic. In most cases, you can fix the situation:

• The broken plume of the display or battery can be replaced separately (cost 300-800 rubles).
• Scratches on the case are masked with a special pencil for plastic (for example, Edding 8400).
• If the phone doesn’t turn on after assembly, check the connection sequence of the plumes and battery contacts.

📌 Key conclusion: 80% of problems in the dismantling of Xiaomi 9A It's associated with sloppy plume handling and overheating, and if you're not sure about your abilities, practice on a non-working phone or go to a master.

FAQ: Answers to Frequent Questions