Disassembly Xiaomi Mi A2: step-by-step guide with photos and tips

Introduction: Why to disassemble Xiaomi Mi A2 and when it is justified

Disassembly of the smartphone Xiaomi Mi A2 — The challenge owners face when replacing a battery, repairing a screen or diagnosing hardware faults: The model, released in 2018, is still popular today thanks to its pure Android One and balanced specs. However, over time, even reliable technology requires intervention: a bloated battery, cracked glass or problems with the speaker force you to take on a screwdriver.

It is important to understand that the Mi A2 — It's more complex than a flagship with a modular design, and it doesn't have a removable back cover, it's perimeter-glued, and the adhesive tape under the battery in this model is particularly strong, which increases the risk of plumes being damaged by careless removal. Before you start, evaluate your skills: if you have never disassembled smartphones, it is better to contact the service center.

In this article, we will take a look at each step, from tool preparation to reassembling the device, and learn how to avoid common mistakes (such as a fingerprint scanner plume breaking) and what to do if something goes wrong.

Preparation: security tools and measures

Before the dismantling of Xiaomi Mi A2 Make sure you have everything you need, and not even one tool can damage the body or the internal components:

• 🔧 Plastic mediators (2-3 - to separate the glued parts of the body, metal tools will leave scratches!
• 🔨 Cross screwdriver PH00 — screw A2 Small, ordinary screwdrivers will rip them off.
• 🔋 Suction (optional) - helps to lift the back cover after warming up.
• 🔥 Dryer or thermo-air station - for softening the glue (temperature not higher than 80)°C!).
• 🧴 Isopropyl alcohol 90%+ — Removing glue residues and cleaning contacts.
• 📦 The screw container - in Mi A2 12 screws of different lengths, easily confused.

Pay special attention to safety:

• ⚡ Turn off your phone and wait for the battery to run out of power (below 25%), which will reduce the risk of short circuits when contacts are accidentally closed.
• 🧤 Work with gloves – some components (such as antenna modules) have sharp edges.
• 📵 Take it down. SIM-card and memory card - they can interfere with the dismantling.

⚠️ Attention: If your Mi is yours A2 If you have been in water or have been hit hard, disassembly can lead to permanent failure, dry the device in rice first (at least 48 hours) or use an ultrasonic bath.

Step 1: Removing the back cover

The back cover of Xiaomi Mi A2 It's glued all over the perimeter, so you can't just put a mediator on it:

1. Heat the back panel in a circle during 2-3 minutes, keeping him at a distance 5-7 The temperature should be comfortable for the hand (not higher). 80°C).
2. Then, put the suction cup on the bottom (near the connector). USB-C) If the lid doesn't lend itself, warm up for another 1 minute.
3. Insert a plastic mediator into the gap and slowly lead it along the case, separating the glue. Be careful about the power buttons and volume - there are plumes!

If the lid fails, don't put too much effort into it. A2 sub-cover:

• 🔋 Battery (glued to the cover with an additional tape).
• 📡 Antenna modules (thin metal plates on the sides).
• 🔄 Fingerprint scanner plume (coming from the power button).

⚠️ Warning: Do not use a knife or metal tools to split the case! A2 aluminum frame easily scratches, and the plume of the fingerprint scanner is located only 1 mm from the edge of the cover.

When you remove the lid, you'll see it on the inside.

• 12 screws (different lengths!).
• A metal plate covering the battery.
• Camera plumes and fingerprint scanner.

Step 2: Battery disconnection

Before any manipulation with the insides of Xiaomi Mi A2 You have to turn off the battery:

1. Unscrew 4 screws that lock the metal plate over the battery (use a screwdriver). PH00).
2. Carefully put the plate under the mediator and remove it, and underneath it you will see a battery connector (white connector with an orange tongue).
3. Take the connector with a plastic spatula and unplug it from the motherboard.

Now we can start removing the battery itself. A2 It's particularly tightly glued -- double-sided tape is used here. 3M VHB, It's hard to remove without heating:

1. Warm up the battery with a hair dryer on the back side (through the back cover) during 3-4 minute.
2. Put a plastic card on the battery on either side and slowly pull it up. If it doesn't give in, warm it up. 1-2 minute.
3. Once removed, remove the residues of the adhesive from the case with isopropyl alcohol. Do not use acetone - it will damage plastic parts!

If the battery is swelling, don't try to pierce or bend it! A2 It uses a 3010 mAh lithium polymer battery, which can ignite if damaged:

• 🔥 Place the battery in a non-combustible container (such as a metal jar).
• 🚯 Dispose of it in special reception points (do not throw it into ordinary garbage!).

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If the battery is not swelling, but discharges quickly, check its capacity with a multimeter. Normal voltage is 3.7-4.2 V. If it is below 3.5 V, the battery needs to be replaced.

Step 3: Dismantling the motherboard

Xiaomi Mi motherboard A2 It's locked in 8 screws and a few plumes. Before you take it off, disconnect all connectors:

1. Unscrew the screws around the perimeter of the board (note: 2 screws shorter than the rest - they fix the board at the connector). USB-C).
2. Disconnect the plumes in that order: 📸 Main camera (black connector). 📷 Front camera (white connector). 🔊 Speaker and microphone (gray connector). 📶 Antenna cables (3 pcs, glued to the board).

Carefully tuck the board with a plastic spatula on the side of the connector USB-C And lift it up at an angle of 30.°. Don’t pull vertically – you can tear the plume of the fingerprint scanner!

On the back of the board are located:

• 🧠 Snapdragon 660 processor (under metal radiator).
• 💾 EMMC memory 5.1 (4/6 GB RAM + 32/64/128 GB ROM).
• 📡 Module Wi-Fi/Bluetooth (Qualcomm WCN3990).

⚠️ Attention: In Mi A2 The fingerprint scanner plume is soldered to the motherboard, and if you pull the board too sharply, it can come off, in which case the scanner will stop working, and the replacement will cost 1,500 to 2,000 rubles.

After the charge is withdrawn, examine it for:

• 🔍 Darkened or bloated capacitors (a sign of overheating).
• 💧 Corrosion (if the phone is in the water).
• 🔥 Burned tracks (often found after unsuccessful firmware).

Step 4: Screen Replacement and Other Repairs

If your goal is to replace the display Xiaomi Mi A2, After you have paid your mother's fee, you will need to:

1. Unscrew 4 screws fixing the metal frame of the screen.
2. Warm up the edge of the display with a hairdryer (temperature 70–80)°C) and gently apply it to a plastic mediator. A2 The screen is glued all over the perimeter, so act slowly.
3. Disconnect the display plume (it is under the metal cover at the top).
4. Install a new screen, having previously cleaned the frame from the old glue with isopropyl alcohol.

When replacing other components, consider:

• 🔊 Dynamic: glued to the body, to remove the dryer warm up. New speaker costs 300-500 rubles.
• 📷 Camera: mounted to 2 screws. When replacing, check the tightness of the sealing gum (moisture can get inside).
• 🔋 Battery: The original has an article MB-J10, but the analogues of ATL or SDI 3,000-3200 mAh capacity.

Prices for spare parts for Xiaomi Mi A2 (2026):

⚠️ Note: When changing the screen in Mi A2 There is often a problem with automatic brightness control, because the light sensor is located under the glass. If the display does not adjust the brightness after replacing, check the connection of the sensor plume (it goes along with the front camera plume).

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When buying spare parts for Xiaomi Mi A2 Always check for compatibility with the article or IMEI. For example, screens for the Mi version A2 Lite does not fit the standard model!

Assembly of the phone and checking of performance

Assembling Xiaomi Mi A2 It is done in reverse order, but with a few nuances in mind:

1. Before installing the battery, clean the contacts on the board and the battery itself with isopropyl alcohol. Contact oxidation is a common cause of unstable work after repair.
2. Stick the battery to a double-sided scotch 3M 9088 (sold in rolls) Do not use superglue or heat glue!
3. Write the screws in the following order: First, 4 screws of the metal battery plate, then 8 screws of the motherboard (starting with the corner ones), lastly, the screws of the rear cover.

Before final assembly, plug in the battery and check if the phone is turning on. If not, disassemble and check all the connectors.

After assembly, perform the test:

• 🔋 Charging: Connect the charger and make sure that charging is underway (the indicator should burn).
• 📵 Network: Check signal level and operation SIM-map A2 Dual-supported SIM).
• 🔊 Sound: Test the speaker, microphone and 3.5mm connector (if you have one in your modification).
• 📷 Cameras: Take a photo on the main and front cameras, check autofocus.
• 👆 Fingerprint Scanner: Add a new print and make sure it reads.

If something doesn't work, don't panic. 80 percent of the time, the problem is:

• 🔌 A loosely connected plume (recheck all connectors).
• 🔋 Faulty battery (check the voltage multimeter).
• 📱 Failed settings (reset to factory settings via Recovery).

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After assembly, turn on the phone in safe mode (press the power button). →"Safe Mode. If this mode is working, the problem is with the installed applications, not the hardware".

Frequent Mistakes and How to Avoid Them

Even experienced masters sometimes make mistakes when disassembling Xiaomi Mi A2. Here are the most common of them and ways to prevent them:

• 🔧 Folded screws: in Mi A2 Soft threaded screws are used. Use a magnetic-tipped screwdriver to avoid tearing them off, and don't put too much effort into it. If the screw is pulled, it can be extracted with a screw extractor or superglue (please drop on screwdriver, press on screw screwdriver and wait for drying out).
• 🔋 Damaged battery plume: When you disconnect the connector, don't pull the wires, they're very thin. If the plume breaks, it can be replaced (article) XM-1234-567, price ~300 ruble) or solder a new connector.
• 📡 Teared antenna cables: they are glued to the board and easily detached when removed sloppy. If this happens, solder them back or replace the antenna module (cost) ~500 rubles).
• 💧 Moisture on board: Even if you haven't dropped your phone in water, condensate can form when cooled sharply after a dryer warms up. To avoid corrosion, dry the rice board 12 to 24 hours before assembly.

If you encounter a black screen after assembly, the reasons may be as follows:

If after disassembly the phone stopped charging, check:

1. Integrity of charging socket USB-C (oxidize).
2. The power controller's performance (on the board is indicated as PM8998).
3. Battery voltage (should be 3.7-4.2 V). If below 3.5 V, the battery needs to be replaced.

FAQ: Answers to Frequent Questions