Disassembly Xiaomi Mi A2: Complete guide with photos, schemes and secrets of masters

Xiaomi Mi A2 — One of the brand's most popular smartphones, released in 2018, and despite the years that have passed, the device is still in demand due to its balanced specs, clean Android One and affordable price in the secondary market. from replacing the battery to cleaning the connectors or recovering from a fall.

Disassemble Mi A2 It's not a simple task, but it's a glue, brittle plumes and miniature screws that make it more likely to be damaged by careless actions. In this article, you will find a step-by-step photo guide, a list of tools you need, and unique tips from service engineers to help you avoid typical errors. We will also tell you which parts most often fail and how to diagnose them before dismantling.

If you've never taken a smartphone apart before, we recommend that you take a close look at each step and prepare the workplace. Mistakes can be costly, from damaging the display plume to completely failing the device. But with the right approach, even a beginner can do the job!

Preparation for disassembly: tools and safety

Before starting the disassembly of Xiaomi Mi A2, Make sure you have everything you need, and not even one tool can lead to improvisations that often end in failure:

• 🔧 Set of screwdrivers (cross-haul) PH00, flat 1.5 mm, five-pointed Y00 back-coat).
• 📱 Plastic mediators or guitar mediators (to separate the cover and display).
• 🔥 Hair dryer or thermo-air station (for softening glue, temperature 60-80)°C).
• 🧲 Magnetic mat or container (to avoid losing screws).
• 🔍 Loop or magnifying glass (for working with small details).
• 🧴 Isopropyl alcohol 90%+ (Cleaning contacts and removing glue residues).
• 📦 Thin Scotch or Painting Tape (for fixing plumes).

Also, prepare the workplace: it should be well lit, draft-free (so as not to blow up the dust) and with enough space to lay out the parts, use an antistatic bracelet or at least periodically touch a grounded metal object to remove static electricity, which can damage the chips.

⚠️ Warning: If you're disassembling a smartphone with a battery that's under 20 percent, plug it into a charger 10 to 15 minutes before you start work. A fully discharged battery can swell when it's mechanically exposed, which is dangerous!

It's not superfluous to take pictures of the original location of the plumes and screws at each stage, which will help avoid confusion when you build them back, and for convenience, you can use apps like Google Lens to recognize the markings on the boards.

Removing the back cover: how not to break the latches

Mi back cover A2 It's attached to glue and plastic latches, and if you pull it without preparation, you risk breaking the mounts or damaging the antenna circuits:

1. Turn off your smartphone and remove the tray for SIM-cards (use a paper clip or special key).
2. Put a paint tape on the junction of the lid and the body around the perimeter, which will protect the display from scratching when you separate.
3. Heat the edges of the cover with a hair dryer for 2-3 minutes, keeping it at a distance of 5-7 cm.
4. Insert a plastic mediator into the gap between the lid and the body (start at the lower right corner where the antenna is located). Carefully drive it along the edge, separating the latches.

If the lid doesn't lend itself, don't force it. You better warm up the problem area again.

• 📍 Near the camera (top left corner).
• 📍 Type-C connector (lower edge).
• 📍 Next to the volume buttons (left side).

⚠️ Warning: Do not use metal tools to separate the lid! they can slip and damage plumes or board.If the mediator does not help, try a suction cup (for example, from the screen), but do not pull too hard - the glass may crack.

After removing the cover, you will see:

• 🔋 Battery with connected plume.
• 📶 Antenna contours (do not touch them unnecessarily!).
• 🔊 Dynamic and vibrator (lower part).
• 📷 Main camera module (mounted on metal frame).

Battery shutdown: why it's critical

Before any work with the insides of the smartphone, be sure to turn off the battery. Even if the device is turned off, there is a voltage on the board that can cause a short circuit when accidentally touched by the tool. A2 The battery connector is located in the lower part and closed with a black protective tape.

To turn off the battery:

1. Carefully tuck the tape with a nail or plastic mediator.
2. Unplug the connector with the same mediator or plastic tweezers.
3. Fix the tape on the cover of the smartphone with tape so that the connector does not touch the contacts during assembly.

If the battery is swelling (as you can see from the deformation of the lid or the warping of the battery), don't try to remove it yourself! Bloated cells can ignite when punctured.

• 🚫 Do not use metal tools.
• 🔋 Do not puncture or press the battery.
• 📞 Contact the service center for recycling.

After the battery is turned off, wait 1-2 minutes, this will allow the residual capacitors on the board to discharge.

Extraction of the motherboard: work with plumes and screws

Xiaomi Mi motherboard A2 It's mounted on 12 screws of different sizes and types, and it's important to remember their location, because tangled screws can damage the board when tightened:

Charge recovery procedure:

1. Disconnect all the plumes: the display, the cameras, the volume/power buttons, the fingerprint sensor (if any) and use plastic tweezers to put the connectors on the side.
2. Twisted all the screws by putting them in a container in groups.
3. Carefully tuck the board with a plastic spatula, starting at the top edge.

If the fee does not come out, check:

• 🔍 Are there any unconnected plumes (especially under the battery) left).
• 🔍 Have you forgotten the screw under the sticker (sometimes it is hidden under the warranty seal).
• 🔍 Is not the fee clinging to the antenna circuits (they can be slightly bent).

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If the plume doesn't detach, don't pull it by the wires! Instead, gently pull the black connector lock upwards (it usually snaps).

Battery Replacement: Selecting a New Battery and Installation

Battery is the most common reason for disassembling Mi A2. Over time, the capacity drops, the smartphone quickly discharges or suddenly turns off:

• 🔋 Capacity: original - 3010 mAh, but you can take increased to 3500 mAh (if the case allows).
• 🔋 Type of connector: must match the original (in Mi) A2 4-pin connector is used).
• 🔋 Manufacturer: Preferably ATL or SDI (They supply batteries to Xiaomi).

To retrieve the old battery:

1. Warm it with a hair dryer on the back (through the lid) for 3-5 minutes. The glue under the battery will become softer.
2. Put a plastic blade on the battery from any angle, and if it doesn't lend itself, use a pull loop (you can make it from a guitar string or a fishing line).
3. If the battery starts to bubble, stop and warm up the problem area again.

When installing a new battery:

• 🧹 Clean the contacts on the board and battery connector with isopropyl alcohol.
• 🎨 Apply a new bilateral scotch or glue B-7000 on the body (not on the battery!).
• 🔌 Connect the battery connector last after installing the board.

⚠️ Attention: If after replacing the battery, the smartphone does not turn on, check: - Is the connector correctly connected (sometimes it sits crooked). - Is there any damage to the train of the board (look under the magnifier). - Are the contacts closed (call the multimeter).

Disassembly of the display and replacement of the touch screen

Xiaomi Mi Display A2 It is combined with a touchscreen, so if you damage the glass or sensor, you have to change the entire module. The cost of the original display is from 3000 rubles, but you can find high-quality analogues (for example, from the original display). BOE or Tianma is cheaper.

To remove the display:

1. Warm up the edges with a hair dryer (temperature 70-80)°C) for 3-4 minutes. The glue under the display is very strong!
2. Insert a plastic blade into the gap between the display and the frame (start at the bottom edge). Carefully drive it along, separating the glue.
3. Once the display is separated, do not raise it sharply - it is connected to the board with a fragile plume!
4. Disconnect the display plume (the connector is under metal protection, which must be unscrewed beforehand).

When installing a new display:

• 🔍 Check whether the plume connector matches the original (sometimes the analogues have a different pinning).
• 🎨 Apply new glue around the display perimeter (recommended) LOCA-glue).
• 🔧 Tighten the screws of the plume fastening without effort - they break easily!

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If you have dead zones after you replace the display or if the touchscreen doesn't work, the problem may be a faulty plume or a poor contact. Try reconnecting the connector or replacing the plume separately (it's worth it). ~500 rubles).

Frequent breakdowns and how to diagnose them before disassembly

Before you take down the Mi A2, You should make sure that the problem is really iron:

If you are not sure about the diagnosis, use the test codes to check the hardware:

• 📱 Enter the dialer ##4636## → Select Battery Information (checking the status of the battery).
• 📷 Enter ##0*## → display-and-camera.
• 🔊 Enter ##06## → speaker-check.

If the tests show errors and the disassembly didn't work, the problem may be the firmware. Try resetting to factory settings or reflashing the device via Fastboot.

Smartphone Builder: How to Avoid Mistakes

Reverse Assembly Xiaomi Mi A2 It's as responsible as the showdown. Here are the key points to look at:

1. Check all the plumes: they should sit tight, without skewing, especially the plume of the display — if it is curved, the screen will flash or not work.
2. Tighten the screws cross-cross like the wheels of a car, and this will prevent the board from skewing.
3. And remember, insulation: if you've been taking off antenna circuits or metal screens, make sure they're standing still, and without them, you might have signal problems or overheating.
4. Test in stages: 🔋 Connect the battery and check if the smartphone is turned on. 📶 Make sure it works. SIM-maps and wifi. 🔊 Check the speakers and microphone. 📷 Test the cameras and fingerprint sensor.

If something doesn’t work after the assembly:

• 🔧 Check the connection of the plumes (especially if the display or camera is not working).
• 🔋 Make sure the battery is connected correctly (sometimes the connector does not sit down until the end).
• 📡 Check the antenna circuits – if there is no signal, it is possible that they are not pressed against the board.

⚠️ Attention: If after assembly, the smartphone warms up more than usual, most likely, you forgot to apply the thermal paste to the processor or improperly fixed the metal frame!

If everything is working properly, seal the screws on the lid with a sealant (for example, Loctite 401) - this will prevent them from self-unwinding, and you can also apply a thin layer of glue around the perimeter of the lid for better sealing.

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Once assembled, let the smartphone run for 10 to 15 minutes in normal mode, and if it doesn't warm or turn off, it's all assembled correctly.

Frequently asked questions