How to disassemble Xiaomi Note 7: step-by-step repair instructions

Xiaomi Redmi Note 7 has proven to be a reliable device with excellent camera and performance, but even the most durable gadgets are not immune to mechanical damage. A broken screen, a worn-out battery or charging connector problems are typical scenarios that require intervention inside the case. Many users wonder whether it is possible to repair yourself without overpaying service centers, and the answer is if you take care.

The process of disassembling the Redmi Note 7 requires a certain skill and the presence of a basic set of tools, since the design of the device involves the use of adhesive joints and screws of different lengths. Wrong actions can damage the plumes or, worse, to bloat the battery if you sloppy handling. In this article, we will discuss each stage of the dismantling in detail, paying special attention to the nuances that are often missed by beginners when they first get acquainted with the device.

Before you start, you need to prepare a good lighting workplace and keep your safety in mind. Power out is the first thing to do, but in the case of non-removable batteries, this is only possible after a partial opening of the case. Below we will look at the full algorithm of actions that will help you safely disassemble the phone to replace components.

⚠️ Warning: Before starting any work, make sure that the battery is less than 25% charged.Working with a fully charged lithium-ion battery if its body is damaged carries a high risk of fire.

Tools and workplace preparation required

Quality preparation is half the success of any electronics repair. To disassemble the Xiaomi Redmi Note 7, you will need a specialized set of tools that can be purchased in radio parts or ordered online. Using improvised tools such as knives or pins is strongly discouraged, as they can damage internal components or scratch the body.

Special attention should be paid to heating equipment. The back of the smartphone is planted on a double-sided tape, which softens only at a temperature of about 80-90 degrees Celsius. The use of a hair dryer in this case is ineffective, because it does not give enough temperature, and the building hair dryer requires care not to overheat the display matrix.

• 🔧 Precision screwdrivers (cross-haired) PH000 flat).
• 🔥 A heating pad for phones or a building hair dryer with a thermostat.
• 🎴 Plastic shoulder blades (mediators) and screen suction cup.
• 🧲 Magnetic screw-sorting mat.
• 🧤 Antistatic gloves and dielectric-coated tweezers.

Organize the space so that small details don't get lost. The screws in the Redmi Note 7 come in different lengths and threads, and entanglement can damage the motherboard or body. It's recommended to use a magnetic mat or cell container, signing each step of the unscrewing.

⚠️ Warning: Never use metal tools to tamper with plumes or battery. Metal can short contacts on the board, which will lead to irreversible failure of the device.

Dismantling of the rear glass panel

The first step is to remove the back cover, which in the Note 7 is made of tempered glass. This beautiful but fragile solution requires careful handling of heat. Put the phone back up on the heating pad and turn on the heat to 80-90 degrees. The heating time is usually 5-7 minutes, but depends on the power of your equipment.

After warming up, gently apply a suction cup at the bottom of the back cover, closer to the edge, and slightly pull up, creating a gap. Insert a thin plastic card or mediator into the resulting gap. Don't try to remove the lid immediately with a jerk, as the adhesive layer may not have time to soften evenly throughout the area.

Swipe the plastic blade around the perimeter of the device, gradually freeing the edges. Pay special attention to the areas around the camera module and fingerprint scanner where the glue can hold tighter. If you feel strong resistance, it is better to add another minute of heat than risk the integrity of the glass.

When the lid is completely separated, put it in a safe place, preferably on a soft fabric, so as not to scratch the glossy surface, and now you will have access to the internal layout, where you immediately notice the protective plastic bar that covers the plumes and screws of the motherboard.

Removal of the protective bar and disconnection of plumes

There's a long plastic bar underneath the back, which is fixed by multiple screws around the perimeter and in the center, and these screws can also vary in length, so remember where they are. Use a magnetic-tipped screwdriver to unscrew them so you don't drop the screws deep into the body.

Once you've removed all the screws, you need to gently tuck the bar with a plastic blade, which is held on latches that break easily when you're not careful, and you need to move slowly, walking along the lattices and snapping the latches, and underneath that are the main connectors that you need to turn off before you take the board out.

First, turn off the battery plume, which is a critical step that turns the device off and makes it safe to operate, then disconnect the display and touchscreen plumes, and use a plastic blade or nail to do that, putting the connector vertically upwards.

Don’t forget to also disable antenna cables if they interfere with access, and the plume of the lower board. In the Xiaomi Note 7, the antenna cable passes through special slots in the case, and it must be carefully released to avoid damaging the thin wire.

Extraction of motherboard

After all communications are turned off, the motherboard is still held by the screws. In the Redmi Note 7, the board is mounted with multiple screws around the edges and around the cameras. Unscrew them all and fold them separately. Also, look at the screws that attach the main camera module if you plan to replace it.

To retrieve the board, gently lift it on one side, to see if any plume or antenna is caught. The board should come out freely, effortlessly. If something interferes, stop and recheck the connections. Sharp movements can break thin tracks on the board itself.

Notice the auditory speaker, which is often attached to the body separately or to the board itself. In some revisions, it may remain in the case and need to be carefully removed with tweezers. Also check the condition of the speaker's sealing gum, as it affects the volume and sound quality.

Once the board is successfully removed, look at it for visible damage, oxides, or capacitor bloating, and if the repair involves a screen replacement, now is the time to switch to the front of the device.

Replacement of the display and touch screen

The screen in Xiaomi Note 7 is glued to the frame of the case, which makes the replacement process much more difficult compared to models where the display is held on screws. To remove the broken module, you will need heating again. Put the phone on the front side of the heating pad and warm up for about 5-7 minutes.

Use a thin string or a special opening knife to cut the adhesive layer around the perimeter. The movements should be smooth, without jerking. Try not to push against the center of the screen so that the glass fragments do not damage the matrix (if it is still intact) or the frame.

After removing the old module, carefully clean the frame of the glue residue. The surface must be perfectly smooth and fat-free, otherwise the new screen will be skewed or gaps will be visible. Use alcohol and a lilaless wipe for cleaning.

⚠️ Warning: When installing a new display, be sure to check its performance before the final sticker. Connect the plumes, turn on the phone and check the image and touch.

Apply a new glue (B-7000 or special glue for screens) in a thin strip along the perimeter of the frame. Apply a new module, press slightly and lock with gums for 15-20 minutes before the primary polymerization of the glue. Remove the excess glue immediately until they are frozen.

Battery operation

Replacing the battery is one of the most common reasons for disassembling smartphones. In the Xiaomi Redmi Note 7, the battery is held on a powerful adhesive layer, trying to pull it by the tongue (if any) or picking with a screwdriver can cause puncture and fire.

Put the phone on the heating pad with the back cover upwards (or without the cover if it's already removed) and heat the battery area for 5-10 minutes. The glue should become elastic. Use the plastic card to gradually, millimeter by millimeter, separate the battery from the housing.

Move the card along the battery, trying not to bend it or pierce it. If the battery sits very tightly, you can use special adhesive solvents (for example, iSesamo or analogues) by putting a couple of drops under the edge of the battery.

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Use a suction cup to create battery tension during the card tweaking - this will greatly facilitate the process of separation of the glue.

Installation of the new battery is made only after a thorough cleaning of the bed of old glue. The new battery should sit tight, without backlashes. Before final assembly, check the voltage on the contacts of the battery with a multimeter to make sure that it is serviceable.

Assembly of the device and verification of functionality

The assembly is done in reverse order, but requires care. First, install the motherboard and plug in the battery plume to check for power, and make sure the phone responds to the charge and the power button.

Then, consistently connect all the other plumes: display, touchscreen, cameras, lower board. Put antenna cables in your channels and press their contact pads with screws. Incorrect stacking of the antenna can lead to a deterioration in signal reception.

Set a plastic safety bar and twist all the screws. Don't forget the screws around the charging socket and at the bottom of the body. Make sure that no screw is left out, which is a common mistake that can cause cracking when the vibrator is running.

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The basic principle of assembly is not to use force, and if the part doesn't fit, you've missed something or confused the orientation of the plume.

The final step is to stick the back cover together, apply the new glue around the body, apply the glass and lock the device with rubber bands, and leave the phone to dry for at least 2-3 hours, or better overnight, so that the glue is fully durable.

Frequently Asked Questions (FAQ)