Modern smartphones, despite their reliability, often require intervention in the “iron” after a fall or prolonged operation. If you have Xiaomi Redmi 7 crashed screen or stopped holding the battery, replacing components on your own can save a significant amount of money.
Before you start, it's important to understand that you're violating the factory seal, if it's declared by the manufacturer, and the main challenge with this machine is that the back cover is glued around the perimeter, and access to the motherboard is completely blocked by other nodes, and you'll have to sequentially remove the display, frame and battery to get to the bottom connectors.
In this article, we will take a closer look at each step of dismantling so you can safely replace the display or maintain the internal components. We will not only list the steps, but also point out the typical mistakes that beginners make when working with fragile electronics.
Tools and workplace preparation required
To successfully disassemble the Redmi 7, it’s not enough to have a screwdriver on hand. You’ll need a specialized toolkit that minimizes the risk of damage to plastic body elements and plumes. Using inappropriate items like knives or pins often leads to irreversible scratches and even battery punctures.
Organize the workspace so that all screws are not lost. Magnetic mat or a piece of paper with a drawn screw layout will help you not get confused when you build. Remember that the screws in Xiaomi smartphones can have different lengths and threads, so tangled fasteners can damage the motherboard or body.
Below is a list of mandatory tools for the job:
- 🔧 Screwdriver kits (Torx star) T5, Phillips #000 – for twisting the screws of the body.
- 🧲 Magnetic mat or organizer for screws – so as not to lose small details.
- 🔥 Dryer or heating platform – to soften the glue under the back cover and display.
- 💳 Plastic card or mediator – to crack the case without damage.
- 🧴 Isopropyl alcohol and sucker - for the safe separation of the display module.
Pay special attention to the source of heating. The temperature should not exceed 80-90 degrees Celsius, otherwise you can damage LCD-Keep the hair dryer in constant motion, warming the perimeter evenly. Don't concentrate hot air at one point for more than a few seconds.
☑️ Preparation for disassembly
Removal of the back cover and primary dismantling
The process begins with the removal of the tray for SIM-This is standard, but it's important not to lose the paper clip, because you're going to need it for the final assembly, and then you turn off the smartphone and heat the back glass panel around the perimeter.
⚠️ Attention, don't heat the center of the back, there's a battery, only heating the edges around the perimeter for a period of time. 2-3 minutes will allow you to soften the glue layer.
Use a suction cup to create a small gap between the glass and the frame, gently insert a plastic mediator into the resulting gap and guide it along the edges, cutting the glue, and do not enter the tool deeply so as not to touch the fingerprint scanner plume or side plumes.
When you take the lid off, you'll see a plastic lining covering the bulk of the components, which is mounted on several screws and plastic latches, unscrew the visible screws, then gently tuck the lining in with the mediator, underneath which is the battery and the lower board.
- 🔋 Carefully disconnect the battery plume before any action with the charge.
- 📷 Be careful with the main camera plume, it can be glued to the frame.
- 🔊 The speaker is fixed with screws, do not pull it by force, so as not to break the membrane.
At this point, you can see the basic architecture of the device, the battery takes up almost half the volume, and the motherboard is located at the top, and access to the charging connector is closed for now, because it is under the main board.
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Use isopropyl alcohol to dissolve the glue residue on the frame, which will make it easier to install a new cover and provide better adhesion.
Dismantling of the display module and frame
To get to the motherboard, you need to take off the display. Unlike the flagship models, in Redmi 7, the screen is glued to a plastic frame. Heat the front of the device, as you did with the back cover, but with even greater care.
Use a thin line or a special separation tool to separate the glass from the frame. The movements should be sawing, not stabbing. After separation, turn off the two main plumes: one is responsible for the image, the other for the touchscreen.
Now you have the metal protection of the motherboard, which is mounted with a lot of screws of different sizes, and remember or photograph the location of each screw, because they vary in length from 1-2 mm, which is critical for assembly.
| Component | Type of screw | Number of | Location. |
|---|---|---|---|
| Metal board protection | Cross (small) | 12 pcs. | Perimeter of the charge |
| Fixing fees | Cross (medium) | 4 pcs. | Fee angles |
| Plastic frame | Cross (long) | 6 pcs. | Along the hull |
| Dynamician | Cross (small) | 2 pcs. | The bottom part |
After unscrewing all the screws, gently raise the board. Notice the plume assembly that connects the main board to the bottom (where the charging connector is located), which is a plume that runs under the battery and is often glued to it.
Replacement of the battery and lower board
To replace the battery, you have to remove it completely from the case. It's glued to a double-sided tape. You can apply a plastic blade to the edge of the battery and drop some alcohol under it to loosen the glue. You can never use metal objects that can pierce the cell.
The sub-board is attached to the plastic frame with a few screws. Unscrew them and carefully remove the board. It has charging connectors, microphones and antenna contacts. When you install the new board, make sure that the antenna antenna antenna antenna antenna antenna antenna antennas are tightly pressed to the contact areas.
The bottom is assembled in reverse order, the board is set first, the plume is laid, and then the main board can be returned to the site, and make sure that the plume is not twisted or clamped.
⚠️ Attention! When installing a new battery, make sure the connector sits tightly in the connector. Poor contact can lead to spontaneous reboots or a failure of charge.
If you change the charging connector, check the microphone's condition as well, as they are often on the same board. Blow the microphone holes with compressed air or gently brush with a soft brush.
Assembly of the device and verification of functionality
Assembly is a reverse process, but requires the same care. Start by installing the main board and connecting all the plumes. Make sure each connector snaps with a characteristic light click.
Before you roll all the metal screws, plug in the display and battery plume, turn on your phone to check the touchscreen, the image and the sound, and if everything works, turn off the device and continue building.
Apply a new glue (B-7000 or similar) to the rear cover frame. Spread the thin layer evenly and press the glass. Set the edges with rubber bands for 15-20 minutes before the primary glue grip.
- ✅ Check the vibration and all volume buttons.
- ✅ Make sure the proximity sensor is working correctly during the call.
- ✅ Check charging in different positions of the cable.
The final stage will be the installation of the tray SIM-Turn on your smartphone and run a stress test: run a heavy app or game to make sure the system is not overheating and stable.
What if the screen does not work after assembly?
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The rule of assembly is not to use force, and if the part doesn't fit, you miss the screw or you misplace the plume.
Frequent mistakes in self-repair
One of the most common mistakes is ignoring the heating of the case when removing the display. Attempting to tear the screen "cold" almost guaranteed to lead to cracks in the new glass or damage. LCD-A matrice that is very fragile.
Another problem is the loss of screws or the use of inappropriate tools, screws screwed in the wrong holes can break through the motherboard layers, causing a short circuit, use a magnetic mat and sort the fastener by disassembly steps.
It's also often forgotten to glue the back cover or it's done carelessly, which causes the smartphone to creak over time, dust to get inside, and at worst, moisture, and high-quality sealing is a sign of a professional approach.