Disassembly Xiaomi Redmi Note 3: how to remove the back cover

The Xiaomi Redmi Note 3, despite its age, remains a popular device due to its metal body and robust design. However, it is the all-metal body that creates certain difficulties when it comes to getting to the internal components. Owners often face the question of how to remove the lid without damaging it and leaving traces on the frame. This may be necessary to replace the battery, clean the dynamic head or repair the charging plume.

The process of dismantling in this model is very different from disassembling plastic machines, where it was enough just to tamper with the nail panel. It uses a two-part glue that over time polymerizes and requires heat treatment to soften, improper actions can lead to the deformation of thin metal or, worse, damage to the plumes that go from the main board to the control buttons.

In this guide, we will go through all the steps of preparing and removing the back panel directly, and we will look at the necessary tools, temperature regimes and safety techniques that will allow you to perform the procedure as cleanly as possible. It is important to understand that rushing is the main enemy, so be patient and attentive to detail.

Tools and workplace preparation required

Before you start any manipulation of the case of the smartphone, you need to organize the right workspace, the surface should be clean, flat and well-lit so that you can see the smallest details of the design, the ideal option would be to use an antistatic mat, although for a one-time procedure, a clean sheet of paper on the table will do.

You need a specific set of tools that you can't disassemble safely without, and the main tool is a suction cup that allows you to create a vacuum grip on the smooth metal surface of the lid, and an indispensable tool is a thin plastic blade or mediator that you use to cut the adhesive layer without scratching aluminum.

You need a heat source to soften the glue. Professionals use temperature-adjusted thermophens, but you can use a hair dryer at home, although you'll have to warm up longer. Don't forget to prepare a screw tank and a cross screwdriver of the right size, because the fasteners are very small and easily lost.

Pay special attention to safety. Although battery voltage is not for humans, short circuiting can permanently disable the device, so before starting work, be sure to turn off the smartphone and, if possible, discharge the battery to a minimum to reduce the risk of fire in case of accidental damage.

Technology of heating the body and softening of glue

The key to the success of the whole operation is to properly warm up the body perimeter. The adhesive used by Xiaomi manufacturer starts melting at around 80-90 degrees Celsius. Exceeding this temperature is dangerous for the display matrix and internal plastic elements, so controlling heating is critical.

Turn on the dryer at average power and start warming up the ends of the smartphone, evenly moving the flow of hot air. Do not hold the hair dryer still at one point for more than 3-4 seconds, so as not to overheat the local area of metal. The entire process of primary warming up usually takes from 2 to 5 minutes depending on the power of your tool.

⚠️ Warning: Never heat the center of the back cover where the Mi logo is located. In this area under the metal is the main camera module, and overheating can lead to black spots in the pictures or complete failure of the sensor.

You can check if the glue is ready to separate by pulling the suction cup carefully, and if the lid is slightly suctionable and springy, the temperature is reached, and if the panel is dead, the heating procedure must be repeated, and the metal is highly thermally conductive, so it quickly gives off heat to the insides, and you have to heat it cyclically.

The process of separating the back panel from the frame

After enough warming up, place the suction cup at the bottom of the back cover, closer to the charging connector, but not at the very edge. Pull the suction cup up, creating a gap between the metal and the frame. Into the resulting gap, immediately insert a thin plastic card or knife blade, fixing the gap so that the glue does not grab again.

As you move along the perimeter, gently drive with a blade, cutting the adhesive layer. The movements should be sliding, parallel to the plane of the lid. Do not try to push the lid upwards by arching the metal, as the aluminum alloy may not withstand stress and deform, leaving dents or cracks.

Be very careful at the top of the smartphone, and underneath the metal insert, there are plumes of volume and on buttons, and if you damage these thin conductors, the phone will stop responding to the presses, and repairs will become much more difficult and expensive.

• 🔥 Warm up the edges. 30-40 seconds before each new section of the.
• 🛑 Do not use metal blades to trim glue around the perimeter.
• 👐 Hold the back cover with the second hand so it doesn't fall off after peeling off.

When you pass the entire perimeter and the lid starts to move freely, don't take it off abruptly. Make sure there are no glue areas left anywhere, and only then gently pull the panel aside, opening access to the insides of the device.

Features of the design of Redmi Note 3 and hidden screws

Unlike many modern monoblocks, the Redmi Note 3 doesn't immediately have access to the battery or boards when you remove the back cover, and it has an additional metal protective plate covering the bulk of the components, and it's screwed with a lot of small perimeter screws.

In addition, under the decorative plastic stub of the antenna, additional fasteners are often hidden at the bottom of the case, which is an engineering solution to enhance structural rigidity and improve radio transparency in the area of the antenna modules.

When unscrewing the screws of the protective plate, it is recommended to sort them by length. Xiaomi smartphones often use screws of different lengths for different nodes, and installing a long screw in the hole for a short one can lead to a failure of the board or damage to the screen on the back side.

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Take a picture of the screws before unscrewing them or use a magnetic mat with markings so as not to confuse the fastener when assembly.

Working with internal plumes and battery

Once the protective metal screen is removed, the main nodes are accessed, and the first step is to disconnect the battery plume from the motherboard, a safety requirement before any further manipulations inside the smartphone.

The main button plume (fingerprint scanner) in this model often goes through the entire length of the case or is attached to the lower board. Be very careful: it is very thin and easily breaks when carelessly jerking. Use a plastic blade to turn off the connectors, putting them strictly upwards, without skewing.

⚠️ Note: The battery in the Redmi Note 3 is also planted on glue. When replacing or removing it, it is strictly forbidden to pierce it or compress it strongly, as this will cause lithium to ignite.

If your goal was just to clean the speakers or replace the vibrator, then at this point you already have full access to the bottom of the case. The lower board is attached with multiple screws and plastic latches that require careful latching around.

Typical errors and precautions

The most common mistake when removing the lid is to use excessive force early on. Users often underheat the glue and try to tear the panel away, leaving deep scratches on the metal from the tool or dents from the suction cup. Remember, the metal is plastic and easily changes shape under load.

Another mistake is ignoring the plumes when you remove the lid. Even if the lid is "clicked," don't throw it away. Make sure no wires connect it to the body. In some versions, the fingerprint scanner can be integrated into the lid or have a very short plug.

• 🚫 Do not use scissors or sharp scissors to pick up gaps.
• 🌡️ Do not overheat the case above 100 degrees, so as not to yellow the plastic elements inside.
• 🔋 Do not remove the battery without disconnecting the plume from the board.

Static electricity is also worth mentioning. Although the risk is minimal, when working in a dry room with synthetic clothing, it is better to periodically touch grounded metal objects to take the charge off the body before touching the electronics.

Assembly of the device and restoration of leakage

Reverse assembly requires as much attention as disassembly, and before you install the back cover, you have to remove the residue of the old glue from the frame and the panel itself, and you can use isopropyl alcohol and soft fabric, and the surface has to be defatted and dust-free.

To fix the lid in place, it is recommended to use special glue B-7000 or T-8000, or ready-made adhesive tapes cut into the shape of the case. Apply a thin layer of glue around the perimeter, avoiding getting into the cameras and sensors.

Once you connect the parts of your smartphone, you need to lock the device with rubber bands or place it under a small load for 1-2 hours to polymerize the glue. Don't turn the phone on right away, let the designs grab. Check all the buttons and the fingerprint scanner before you finalize all the screws.

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High-quality cleaning of surfaces from old glue is the guarantee that the new lid will sit smoothly and without gaps.

Frequently Asked Questions (FAQ)