Smartphone Xiaomi Redmi Note 7 has proven itself as a reliable device, but time does not spare the technology, and over time may require replacement of the screen, battery or repair connectors. Self-disassembly of the gadget is not only a way to save on the services of the service center, but also the opportunity to better understand the device of modern electronics. The process requires accuracy, patience and the presence of a special tool, since the design of the smartphone involves the use of adhesive connections.
Before starting a dismantling, you need to be aware of the risks associated with a violation of the factory sealing of the case. Mistakes can lead to damage to the plumes, cracks in the glass rear panel or, in the worst case, to a battery fire. In this article, we will look at each stage of work in detail to minimize the likelihood of errors and successfully perform Xiaomi repairs at home.
Preparation of the workplace and tools
The quality of the work depends on the organization of the space. You need a smooth, well-lit surface, preferably with a light background, so as not to lose small screws. The ideal solution is a special antistatic mat that prevents the accumulation of static electricity, dangerous to microelectronics.
The toolkit should include not only standard screwdrivers, but also specialized devices for working with glued casings. A heat gun or professional hair dryer is necessary to soften the glue that holds the back cover. Without preheating, the glass can burst from mechanical impact.
- 🛠️ Screwdriver kit: cross (PH000, PH00) flat.
- 🔥 Dryer or thermophene for heating the perimeter of the body.
- 💳 Plastic card or mediator for slashing the body.
- 🔪 Thin metal scalpel or blade.
- 🧲 Magnetic screw-sorting mat.
Pay special attention to the choice of mediator, which should be thin enough to penetrate, but flexible enough not to scratch the internal plastic frames. The use of metal tools at this stage is strictly prohibited, as there is a high risk of damage to the plumes or short contacts on the board.
⚠️ Warning: Before starting any work, be sure to completely turn off the smartphone. Attempting to disassemble the on device can lead to a short circuit and failure of the power controller.
Removal of the rear glass panel
The most critical stage of disassembly is the detachment of the rear cover. In the Redmi Note 7 model, it is glued around the perimeter with a special composition. The heating must be carried out evenly, moving the heat source along the faces for 2-3 minutes. The temperature should not exceed 80-90 degrees Celsius, so as not to damage the display on the back side.
After warming up, insert a thin blade or sucker into the bottom of your smartphone, where your logo or speaker is usually located. Carefully create a small gap and run a plastic card there. Move the map along the perimeter, gradually cutting the glue layer. Sharp movements are unacceptable - the glass must come off smoothly.
What to do if the lid is not removed?
When all the faces are free, gently lift the panel, and underneath it you'll find the main board, the battery, and other components, and the glass on the back is very fragile, so you have to put it on a soft surface, and don't forget to clean the ends of the case immediately before you reassemble it.
Dismantling the protective plate and disconnecting the plumes
Once you remove the lid, you'll see a metal plate that covers the main connectors, and it's mounted with multiple screws of different sizes, so it's important to remember where they are, and you'll want to use a magnetic mat with a markup or a circuit where you'll fix every piece you twist.
And if you spin all the screws around the perimeter of the plate, you take it off, and you open the connectors of the display, the touchscreen, the camera plumes, the main plume, and you first have to turn off the battery to shut down the system, and then you can safely disconnect the rest of the components.
☑️ Procedure for disconnecting plumes
Use a plastic blade to turn off the plumes. Metal tools can damage the contacts or shatter the connector itself. Push the connector from the bottom, slightly swaying it from side to side. If the connector does not lend itself, check if there is a latch or an additional screw on it.
Removal of the battery and replacement of elements
The battery in the Xiaomi Redmi Note 7 is also planted on glue, which makes it difficult to remove it. Under the battery often passes the plume of the lower speaker, so you can not pull it ahead - there is a high risk of tearing the plume. First you need to unstick or carefully bend this plume.
To extract the battery, use special pulling strips (if they are provided by the design) or carefully poke the edge of the battery with a plastic card, preheating the area below it slightly. In some cases, the introduction of a small amount of isopropyl alcohol under the battery to dissolve the glue helps.
| Component | Type of attachment | Risks in dismantling | Tool. |
|---|---|---|---|
| Back cover. | Perimeter glue | Breaking glass | Fryer, sucker. |
| Protective plate. | Screws (different sizes) | Loss of screws | Screwdriver PH00 |
| Battery | Sticky base | Puncture, fire. | Plastic card, alcohol |
| Maternity fee | Screws, connectors | Chip damage | Tweezers, spatula. |
Lithium polymer batteries are sensitive to mechanical damage, and if you accidentally puncture the battery shell, it can instantly ignite, and if you deform or swell, the old battery should be disposed of in a special container, rather than thrown into household garbage.
Removal of motherboard and camera modules
The motherboard is the heart of the smartphone, and it requires maximum concentration, and it's secured with multiple screws and plastic locks, and before you extract it, make sure that all plumes, antenna contacts and button connectors are off.
The cameras in the Redmi Note 7 (main and front) can be attached separately or integrated into the overall design. The main camera is often optically stabilized, so its module is quite heavy and requires careful handling.
⚠️ Warning: Never touch the motherboard contacts or camera lenses with your fingers. Fat marks may oxidize over time or worsen the quality of the images.
When removing the board, raise it strictly vertically so as not to touch or break protruding elements such as connectors or microphones. After removing the board, it is recommended to inspect it under the magnifier for microcracks or oxidation, especially if the phone has previously been in water.
Assembly of a smartphone and checking the performance
The assembly is done in reverse disassembly, but there's an important caveat: before the back cover is finally fixed, you need to do an initial check. Connect the display and battery plumes, then try to turn the device on.
Check the touchscreen, the sound of the speakers, the cameras and the vibrations. If everything is working correctly, you can turn off the battery, wipe the frame with a degreaser and apply a new glue (B-7000 or special adhesive) to fix the rear panel. The glue must dry under the load for at least 2-3 hours.
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Use rubber harnesses or stationery gums to tightly press the back cover against the body during drying of the glue. This will ensure better sealability.
The final step is to clean the screen of fingerprints and install a protective glass. A properly assembled smartphone should not have gaps between the body and the screen, as well as foreign creaks when pressing buttons.
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Quality assembly is more important than speed. Don't rush to twist all the screws at once until you make sure that all the plumes are in their channels and not clamped.