Disassembly Xiaomi Mi A7 (Mi 7A): detailed instructions with photos and secrets of the masters

Disassembling the Xiaomi Mi A7 (also known as the Mi 7A in some regions) is a challenge that owners face when replacing a battery, repairing a screen or cleaning connectors. Despite its apparent simplicity, the device has several pitfalls that can turn the procedure into a beginner's nightmare. In this article, we will examine the process from A to Z: from the necessary tools to the intricacies of dismantling adhesives, which the manufacturer has specifically complicated to protect against unskilled repairs.

It's important to understand that the Mi A7 is an Android One, which means it's different from the classic Redmi or POCO models. There's no removable back cover, and the battery is glued to the case using an industrial adhesive. If you've never disassembled a smartphone before, we recommend you practice on simpler devices or go to a service center. However, with proper care and the right disassembly tools, even a beginner can do it.

In the article you will find:

• 🔧 Complete list of tools with the justification of each item (and what can replace professional equipment).
• 📸 Step-by-step photos of critical stages - from removing the back panel to turning off the plumes.
• ⚠️ List of common errors that cause flexible plumes to be damaged or the display to rupture.
• 🔋 Ways to safely disconnect the battery without the risk of short circuit.
• 💡 Life hacks from masters that save time and nerves (for example, how to soften the glue without a hairdryer).

Preparation for disassembly: tools and security measures

Before you start, make sure you have everything you need, and if you don't have even one tool, you can have a lot of consequences -- for example, trying to stick a lid with a knife instead of a mediator is almost guaranteed to damage the plastic latches.

• 🔨 Plastic mediators (2-3 pieces) - to separate the body. Metal blades can not be used, they scratch the frame.
• 🔥 A hair dryer or heat station (at least 1000 watts) is a hot-dryer for softening the glue, and even a household hair dryer is suitable, but with temperature adjustment.
• ⚙️ Screwdriver kit: cross-haired PH00 and the five-pointed Pentalobe P2 (screw-tray SIM-map).
• 🧲 Magnetic mat or screw container – to avoid losing small details.
• 🔌 Tweezers with curved ends - for working with plumes and connectors.
• 🛠️ Suction (optional) - helps to raise the screen after heating.
• 🧴 Isopropyl alcohol 90%+ — Removing glue residues and cleaning contacts.

If you're planning to replace your battery or screen, pre-order original parts or quality analogues. Mi A7 batteries labeled BM47 or DM-07 (3,010 mAh) will do. Avoid cheap Chinese copies - they often have understated real capacity and can swell in a few months.

⚠️ Warning: Do not use an open fire (lighters, matches) or microwave to heat the case.°C can damage the lithium-ion battery and cause it to ignite. The optimum temperature for softening the adhesive is 60-70°C (keep the hair dryer 10-15 cm from the body).

Step 1: Turn off and remove the back cover

Start by turning off your smartphone completely. If the device doesn't respond to the power button, make a forced reboot: press Power + Volume Up for 10-15 seconds. Make sure the battery is at least 50% dead, which will reduce the risk of short circuits when contacts are accidentally closed.

Next:

1. Remove the tray. SIM-This will relieve the pressure on the body.
2. Heat the back cover with a hair dryer for 2-3 minutes, evenly driving around the perimeter. Pay special attention to the corners - there the glue is applied thicker.
3. Insert the mediator into the gap between the lid and the frame (start at the bottom edge where the USB-C connector is located). Carefully drive the tool along the case, separating the latches.

If the lid doesn't lend itself, don't force it -- most likely the glue hasn't softened enough. Reheat for another 1-2 minutes. A typical beginner error is trying to tear the lid off with a sharp motion, which causes the fingerprint scanner plume to burst (it passes under the top of the case).

Step 2: Shutting down the battery – why it’s critical

When you remove the back cover, first thing you do is turn off the battery.

1. Relax the 4 screws that lock the metal plate over the battery connector (use the PH00 screwdriver).
2. Carefully tuck the plate with tweezers and remove it.
3. Disconnect the battery plume with a plastic mediator (don’t pull the wires!).

Ignoring this step can lead to:

• 🔥 Short circuit by accidental touch of a screwdriver of the motherboard.
• 💥 Damage to the power controller if you touch contacts during further disassembly.
• 📵 Data loss due to sudden power outage when working with memory plumes.

In the Mi A7 models, the battery connector is located under a metal plate labeled "BATTERY." Don't confuse it with the charging connector (USB-C), which is on a separate plume!

Step 3: Dismantling the motherboard and plumes

Once the battery is turned off, you can start removing the motherboard, which is a very careful step, because the Mi A7 plumes are extremely fragile.

1. Disconnect all connectors: 📷 Main camera plume (located in upper left corner). 🔊 Speaker and microphone plume (lower part of board). 📱 Display and touch layer plume (center, under the screen).

Unscrew all the screws.

Carefully raise the fee

Notice the flexible plume of the fingerprint scanner, which is sticky to the frame and easily torn, so that it is not damaged, you can apply the plume to the mediator and separate it from the body.

⚠️ Attention: On the Mi board A7 chip NFC (If your model supports it, which is attached to double-sided tape. If you pick up the board carelessly, the chip can stay on the case, check for it before final assembly!

Step 4: Screen removal is the most difficult step

The Mi A7 screen is glued to a frame around the perimeter, and the plumes are underneath the battery.

1. Heat the screen with a hair dryer (60-70°C) for 3-4 minutes. Start at the bottom where the connector is located.
2. Put a suction cup or a mediator on the screen, and if you use a suction cup, stick it closer to the bottom edge, where there are no flexible plumes.
3. Carefully separate the screen from the frame as you move around, and if you feel resistance, stop and heat the problem area again.

If the screen is removed to replace, do not turn on the smartphone with the old display connected - this can damage the graphics chip on the motherboard.

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Before installing a new screen, wipe the contacts of the plumes with isopropyl alcohol, which will remove the oxide film and improve the connection. Do not use ordinary alcohol or water!

Step 5: Replacing the battery - nuances and life hacks

The battery in the Mi A7 is glued to the body using double-sided high-strength tape to remove it:

1. Put a plastic blade on the battery from any angle. Don't use metal tools, they can puncture the battery!
2. If the battery fails, apply a few drops of isopropyl alcohol under it. The alcohol will dissolve the glue in 5-10 minutes.
3. After removing the old battery, clear the seat of glue residue. The new battery should lie flat, without distortion.

When installing a new battery:

• 🔋 Use the original glue (for example, 3M 9448A) or double-sided tape 0.5 mm thick.
• 🔌 Connect the battery plume last when all other components are already in place.
• 📊 After replacement, perform battery calibration: fully charge the smartphone, then discharge to 0% and recharge to 100%.

⚠️ Warning: If a new battery swells a few days after installation, stop using it immediately! this is a sign of defective or improper storage.

Building a device: how not to make mistakes

The Mi A7 should be assembled in reverse order, but with a few key points in mind:

1. Check all the plumes for contamination or damage, and clean the contacts with alcohol.
2. Make sure all screws are screwed into their places. Rotors of different lengths -- if you mix them up, you can damage the board!
3. Stick the back cover with a new double-sided tape. The old glue loses its properties after heating.
4. Before turning on, check that all connectors are tightly connected and the battery is not shifted.

After assembly:

• 🔄 Reset your settings (via Settings) → System system → Reset) if the smartphone is glitching or does not recognize the sensor.
• 📡 Check the work of all modules: cameras, speakers, microphone, fingerprint scanner.
• 🔋 Charge the battery to 100% and watch the temperature - if the body is warmer than usual, perhaps the battery plume is connected loosely.

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The most common build error is a loosely screwed motherboard, which leads to an "antenna effect": a smartphone loses network or Wi-Fi with a light tap on the case. Always check the reliability of the screw attachment!

Frequent questions about the dismantling of Xiaomi Mi A7