Xiaomi Redmi 7A is deservedly considered one of the most popular budget models, but its plastic case is not immune to mechanical damage. Fall, impact or simply careless handling can lead to cracks in the rear panel, which not only spoils the appearance, but also violates the tightness of the device. Owners often wonder how to remove the lid to replace it with a new one or access the battery for self-replacement.
The dismantling process requires some preparation, as the back panel in this model is glued around the perimeter, rather than being fixed by screws as in older devices. Wrong actions can damage the internal plumes or chips on the frame. In this guide, we will detail each step of the work, the tools you will need, and the precautions you need to follow.
Before you start physically affecting the body, it's important to understand the design of the smartphone. Inside, there are fragile joints that are easily damaged if you act mindlessly. The adhesive layer under the back cover of the Redmi 7A is quite tough, so warming up is a must-have without which there is a high risk of breaking the plastic. Let's look at what it takes to successfully and safely disassemble.
Tools and workplace preparation required
Well, good disassembly begins long before you pick up your smartphone, you need to organize a clean, well-lit space where small details don't get lost or fall on the floor, and the absence of dust is critical, because it can get under the display or into the camera when you open the case.
To work with Redmi 7A you will need a specific set of tools that can be purchased from any radio store or ordered online. Use of improvised tools such as knives or needles, is strongly discouraged, as they can damage the internal elements.
- 🔥 Technical dryer or heating pad for uniform heating of glue around the perimeter of the body.
- 🛠️ A set of screwdrivers with cross bits (usually) PH0 or PH00) screw-in.
- 🎴 Plastic mediators or sucker for careful detachment of the cover without scratches.
- 🧴 Isopropyl alcohol or special solvent of glue (B-7000) surface-cleaner.
- 🧲 Magnetic mat or container for sorting screws of different sizes.
Note that the mediators must be thin but flexible enough to pass through the gap between the frame and the lid. Metal tools are used only to twist screws, but not to rig (smack) plastic.
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Use a suction cup paired with a mediator: fasten the suction cup at the bottom of the lid, pull on yourself, creating a gap, and at this moment carefully enter the plastic spatula.
Security measures and disabling of the device
The first and most important step before any electronics disassembly is to completely shut down the power. Working with the device on can lead to a short circuit, especially if you accidentally hit the battery plumes or contacts with a metal tool.
Turn off your smartphone through the menu or by holding down the power button. Make sure the screen is out and the device is not responding to presses. If the battery is discharged, still try to perform a software shutdown to avoid power surges when connecting the plumes in the future.
⚠️ Warning: Never start disassembling if your smartphone is on. Even in sleep mode, currents pass through the motherboard, and accidental closure of contacts can cause the power controller to fail.
It's worth taking off. SIM-This is done through a special hole in the end of the case using a paper clip or a needle. Removing the tray sometimes helps to gain additional access to the internal screws, although in Redmi. 7A The main screws are hidden under the stickers.
The process of heating and removing the back panel
The most delicate step is to separate the back cover from the frame, which, as mentioned earlier, is held on double-sided tape. To soften the adhesive, you need to warm up the perimeter of the device evenly. Don't hold the hair dryer at one point for too long so as not to overheat the display matrix or the battery itself.
The optimum heating temperature is about 80-90 degrees Celsius. Greathe the edges for 2-3 minutes, periodically checking the temperature with your hand (it should be hot, but tolerant to touch).
☑️ Removal of the lid
Move slowly using the reciprocating motions of the mediator. You should feel the glue detach. If the resistance is too high, stop and warm up the area again. Don't try to tear the lid off by force - the plastic can crack, especially in the area of the camera or logo.
When the lid is completely separated around the perimeter, do not pull it sharply. Inside, a thin plume of an antenna or fingerprint sensor (depending on the modification) may pass.
Dismantling internal components and screws
When you take the back off, you'll see the inside of the smartphone, and you'll see the battery, and you'll see screws around the perimeter that hold the plastic frame of the components.
In the Xiaomi Redmi 7A, screws are often hidden under decorative stickers or rubber plugs. Carefully examine the interior of the removed lid and the top of the body under the camera. Usually you need to unscrew about 10-12 screws of different sizes.
| Location area | Type of screw | Number of | Note |
|---|---|---|---|
| Lower part (near the speaker) | Cross, long. | 2 pcs. | Fixing the speaker's charge |
| Upper part (near the camera) | Cross, short. | 2 pcs. | Holding the top frame. |
| Side edges (perimeter) | Cross, middle. | 6-8 pcs. | Fixing the main frame |
| Under the SIM tray | Crustacean, petty | 1 pc. | Often hidden by a stub |
Stack the screws in order of extraction. Often the length of the screws in different corners is different, and if you confuse them when you build them, you can punch through the plastic or not twist to the end, which will lead to a backlash of the body.
Once all the screws are unscrewed, you need to carefully disconnect the plumes. The main plume connecting the lower board to the motherboard is usually covered with a metal plate. It also needs to be unscrewed. Use a plastic blade to snap the connectors.
⚠️ Attention: Trains at Redmi 7A You can't pull them, you can just snap the connector up, damage to the charging plume or the display will require expensive replacement.
Nuances of work with glue B-7000
Common mistakes in the Redmi 7A
Even experienced craftsmen sometimes make mistakes, let alone beginners, understanding typical problems will help you avoid fatal damage, and most often users underestimate the power of glue or forget about hidden screws.
One common mistake is to try to remove the lid without heating it up enough, so the plastic becomes deformed, white clatters appear on a black or blue case that can't be removed, and another mistake is to use tools that are too thick to tweak.
- 🚫 Battery damage: Careless pressure on a swollen or simply soft battery can cause it to ignite.
Be especially careful with the area around the main camera. The camera module often protrudes and can be hit by the tool when sloppy movement. Also watch the speaker at the bottom - its membrane easily breaks when in contact with sharp edges of the frame.
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The key to a successful showdown is patience, don't force things if the detail doesn't go, but warm it up again or double-check if all the screws are twisted.
Assembly and inspection of the device
After the necessary repairs (replacement of the case, cleaning or replacement of the battery) comes the assembly stage, which is done in reverse order, first install all the internal components, connect the plumes and twist the screws.
Make sure all connectors are snapped to a characteristic click. Metal plates covering the plumes should be screwed into their places, as they perform not only a fixing function, but also a screening function.
Before applying the new glue, check the phone's performance, turn it on, check the sound, vibration, touchscreen and cameras, and if everything is working properly, turn off the phone and proceed with the final sealing.
Apply a thin layer of B-7000 glue or use a ready-made double-sided tape for the Redmi 7A. Press the lid tightly and lock it with rubber bands for 15-20 minutes for primary polymerization. Complete drying of the glue takes about 24 hours.