Redmi series smartphones have long proven to be reliable devices, but even the most durable equipment requires intervention over time. Often owners face the need to replace broken glass, a failed battery or charging plume. Self-disassembly Xiaomi Redmi 7 is a process that may seem difficult only at first glance, but with the right tools and a clear algorithm of actions, it is quite feasible at home.
Before you start dismantling, it's important to understand the internal architecture of the device. Xiaomi engineers designed the case to minimize the risks of damage to components when falling, but this makes access to the insides more time-consuming. You'll need not only accuracy, but also a specialized tool without which you can damage plastic latches or plumes.
In this article, we will take a closer look at every step of the process, from the workspace to the final assembly. We will focus on the nuances that beginners often miss, such as properly disconnecting the plumes and working with the adhesive base. The main feature of the Redmi 7 is that the back cover is glued around the perimeter, rather than being held only on screws, as in older models. This requires a special approach to the initial opening of the case.
Preparation of the workplace and the necessary tool
Quality preparation is 90 percent of the success of any repair. Don't start a showdown on a soft sofa or a kitchen table littered with foreign objects. You'll need a solid, flat surface with good lighting to see the smallest parts and screws of different sizes that are easy to confuse.
To work with the Xiaomi Redmi 7, you’ll need a basic toolkit, which can be found in electronics stores or ordered online. Lack of specialized equipment often results in body damage or even injuries, so take inventory selection seriously.
- 🔧 Set of screwdrivers: mandatory presence of a cross screwdriver PH000 or PH00, and also a flat screwdriver for careful tweaking of elements.
- 🔥 Hair dryer or thermophen: necessary to soften the glue under the back cover; household hair dryers may not give the desired temperature.
- 💳 Plastic card or mediator: used to separate the lid from the frame without scratching and damage to the plastic.
- 🧲 Magnetic mat or organizer: critical for sorting screws so you don’t lose them and know where each was twisted from.
Special attention should be paid to safety. When working with the battery, there is a risk of damage to it, which can lead to fire. Therefore, having a fire extinguisher or a container with sand near the workplace will not be an unnecessary precaution. It is also recommended to use antistatic gloves or at least regularly touch a grounded metal object to relieve static stress from the body.
☑️ Checking readiness for repair
Primary opening of the body and removal of the rear panel
The most important step is to separate the back cover from the main frame, and unlike older phones with removable batteries, it's all held on a powerful layer of glue, and you have to turn off the device and remove the tray. SIM-cards and memory cards so as not to damage them during the heating process.
Turn the dryer on to the average temperature and start warming the perimeter of the back cover. Keep the heat source 3-5 cm from the surface, constantly moving it so as not to overheat one point. The heating process usually takes 2-3 minutes; the plastic should become warm but not scalding to the touch.
⚠️ Attention, don't heat the central back too long because there's a battery underneath, and local overheating can cause the battery to bloat or the electrolyte to ignite.
After warming up, insert a thin mediator or a safety knife blade into the gap between the frame and the lid. Carefully guide the tool along the perimeter, cutting the softened glue. Don't try to bend the lid right away, act slowly, going around in a circle several times. If the lid is "grabbed" again, add a little more heat.
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Use a suction cup to slightly lift the edge of the lid after heating, creating a gap for the insertion of the mediator, which will reduce the risk of chipping plastic.
Dismantling internal protection and disconnecting plumes
When the back cover is successfully removed, you'll see the inside of the smartphone, and most of the space is occupied by the battery, and at the bottom there's a motherboard that's covered with a black plastic cover, and this lid is screwed up with a few screws that need to be unscrewed.
Use a magnetic mat to fold the screws in the order you twist them. In Redmi 7, the screws can be of different lengths and threads. If you screw a long screw into a short hole, you can punch the board or damage the thread, making subsequent assembly impossible.
Once the protective plate is removed, the main connectors will be accessed, and the first step is to turn off the battery plume, which is a critical step, as it shuts down the device and prevents short circuits from continuing to work with other components.
- 🔋 Carefully bend the battery plume with a plastic spatula using a notch for your fingers.
- 📱 Turn off the main display plume that fits the motherboard from above.
- 📷 Remove the connectors of the camera modules if you plan to replace them or deep cleaning.
- 🔊 Disconnect the plume of the lower speaker and charge boards if access to the lower components is required.
Use a plastic blade or nail to turn off the plumes. You can't use metal tools here, because you can't damage the contacts on the board or the connector itself. You need to be confident, but you need to be light, you need to be upwards, not sideways.
What to do if the plume does not turn off?
Removal of the battery and work with adhesive base
The battery in Xiaomi Redmi 7 takes up a significant part of the volume and is glued to the frame with double-sided tape. You can't just pull it out with your fingers - you can damage the shell, which is strictly forbidden. Retrieval will require reheating the back of the device (now the frame with the battery) or using special tools.
There's a method of extracting it with a thin line or string, and you can use a line under the top or bottom of the battery, and you can see the adhesive layer as you move from side to side, and it's a safe way to minimize the risk of deformation.
If you use a suction cup to pull out the battery, do it very carefully. Excessive force can cause the shell to rupture. After removing the old battery, you need to carefully clean the frame of the residue of the old glue. You can use isopropyl alcohol and a plastic card to do this.
| Parameter | Meaning/Description | Importance in replacement |
|---|---|---|
| Model battery model | BN2/BM3E (depending on the audit) | High (exact matching required) |
| Capacity | 4,000 mAh | Medium (affects autonomy) |
| Type of attachment | Double-sided perimeter tape | High (requires care) |
| Tension. | 3.85 In | Critical (cannot be changed) |
When installing a new battery, make sure the contact pad on the battery itself and on the plume is clean. Fat spots from your fingers can worsen contact, so work with gloves or try not to touch the golden contacts. Use a new layer of double-sided tape, which often comes complete with spare parts, to fix.
Replacement of the display and the touch screen module
Replacing the screen with Redmi 7 is one of the most common procedures. The screen here is a single module with a frame, which makes it easier to do, but requires care when you move some elements. If you change only the glass, the process is much more complicated and requires a separator, so consider replacing the full module.
After the plumes are turned off (as described in the previous sections), you need to unscrew the screws that hold the display module around the perimeter. The number can vary, carefully examine all sides of the frame. Often the screws can be hidden under decorative stickers or rubber plugs.
When you remove the screws, you gently lift the module. Don't pull it up, check if all the plumes are off. The new module, before you install it, you should check for performance by simply plugging the plumes into the board and turning on the phone without permanently gluing the screen, which will save you from re-disassembling in the event of a marriage.
⚠️ Attention! When you install a new screen, watch the backlight plume. It's very thin and if you handle it carelessly, it can break, which will cause black spots or stripes in the image.
Apply a thin layer of B-7000 glue or use a pre-made adhesive layer around the perimeter of the new frame. Press the module evenly and lock it with rubber rings or a load for 15-20 minutes before the initial grasp.
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Always check the operability of the touchscreen and matrix before the final gluing of the case, which will save hours of operation in the event of a defect.
Device assembly and final inspection
The assembly is done in reverse order, but requires no less concentration. Start by connecting the plumes to the motherboard. Make sure each connector is in place with a characteristic click. A loosely connected display plume is a common cause of white screen after assembly.
Put the plastic protection on the motherboard and twist all the screws, and it's important not to pull them over, because the plastic can crack, but you can't twist them too, because the contacts can move away when you vibrate. Use a good-point cross screwdriver.
The back cover must also be prepared before installation. Clean it of dust and residues of old glue. Apply a new layer of glue or use special adhesive tapes (B-7000 is also suitable, but dries longer).
- ✅ Turn on the device and check the response of the touch screen in all zones.
- ✅ Test the work of cameras, speakers and microphone.
- ✅ Make sure the proximity and lighting sensors work.
- ✅ Check the charger of the device and operation Wi-Fi/Bluetooth module.
If all tests are successful, the repair is complete, so let the glue on the back dry for a few hours before you use the phone, and it will ensure that it is sealed and dust-resistant in the future.