The Xiaomi Redmi Note 7, launched in early 2019, has become a real bestseller thanks to its stylish design with gradient glass on the back and an affordable price. However, it is the glass structure, while looking premium, that is the device's Achilles heel when accidental falls. Unlike plastic counterparts, the glass does not bend, but breaks, turning into a dangerous crumb that can get inside the case and damage other components.
If you're in trouble, don't rush to a service center, where the cost of work can be a significant fraction of the current market price of the phone. Replacing the back cover with a Redmi Note 7 is a procedure that can be done on your own at home, if you have a minimum set of tools at hand and follow the instructions clearly. It's important to understand that accuracy is crucial here, as we will work with fragile materials and adhesives.
In this article, we will discuss the entire process in detail: from the preparation of the workplace and tools to the final test of the leakage and aesthetics of the assembled device, you will learn how to properly warm the case so as not to damage the display, which solvents to use to remove old glue and how to avoid common errors that can lead to failure of plumes or sensors.
Before starting to disassemble the Xiaomi Redmi Note 7, you need to organize a comfortable and safe space. The ideal option is a table with good lighting, preferably a day or bright table lamp to see the smallest details and cracks. The table surface should be clean and flat so that small screws do not roll into hard-to-reach places.
To successfully carry out the repair, you will need a specific set of tools that can be purchased from any radio parts store or marketplaces, the main tool will be a heating element: this can be a special thermophen, a heating platform or, in extreme cases, a regular hair dryer, although the latter option is less effective and takes more time.
You will also need suction cups to lift glass, thin metal blades or special plastic cards for peeling off, tweezers, a set of screwdrivers (usually cross and Torx), as well as a liquid for dissolving the glue (isopropyl alcohol or B-7000).
- 🔧 Screwdriver Set: Phillips #00 and Torx Crusade T5 frame.
- 🔥 Heat source: thermophene, heating pad or powerful hair dryer.
- 💳 Plastic cards or mediators for glue cracking.
- 🧪 Isopropyl alcohol or special solvent of glue.
Pay special attention to clean hands and tools. Fat spots from the fingers on the inside of the new lid or on the frame can worsen adhesion of the glue, which will lead to detachment in the future.
Dismantling the old damaged lid
The first and most critical step is to remove the broken glass. The main task here is to warm the perimeter of the case evenly to soften the factory glue, but not overheat the display matrix or the battery. The optimal heating temperature is about 80-90 degrees Celsius. Keep the heat source at a distance of 2-3 cm from the surface, constantly moving it along the edges.
⚠️ Warning: Do not heat the center of the phone, where the battery and processor are located. 3-5 Overheating can swell the battery or damage it. OLED-screen.
Once the body is warm enough, place the suction cup on the surviving piece of glass, or on the center piece if it's intact. Pull it up carefully, creating a small gap between the glass and the frame. Insert a thin plastic map or blade into the resulting gap immediately. Act slowly, swiping the tool along the perimeter, cutting the adhesive layer.
If the glass is completely crumbled, the process becomes complicated. You have to carefully remove large fragments with tweezers, trying not to scratch the frame and damage the plume of the fingerprint scanner, which is often glued to the inside of the glass. In some cases, the scanner can be installed separately, but in the Redmi Note 7 it is integrated into the design of the rear panel.
What to do if the glass does not come off?
If the glass is still strong after heating, don't use force. Add a few drops of isopropyl alcohol to the gap and wait a few minutes. The alcohol will penetrate the adhesive layer and greatly facilitate the separation process. Repeat the heating and adding alcohol until the lid is completely removed.> Cleaning the frame and preparing for installation After removing the old lid, you will see a frame with the remains of glue, broken glass and dust. The quality of further installation of the new part depends on how carefully you clean the landing site. Even a microscopic piece of the old one can be applied to the glass, or a special glass cut from the plastic strip, which can be used for cleaning. Walk carefully around the perimeter, removing the fat and residues of the adhesive. The metal frame should be perfectly smooth and clean to the touch. Be sure to check the condition of the fingerprint scanner plume. If it's left on the old lid, it needs to be gently unplugged using minimal heat and transferred to a new part. If the scanner is built into the new lid, make sure the contact pad is clean. Also check the side buttons - sometimes they can shift or get stuck when impacted. 🧹 Remove all large glass residues with tweezers. 🧼 Degrease the frame with isopropyl alcohol. 🔍 Check the integrity of the fingerprint scanner plume. 💨 Blow the internal dust components (you can use a pear). Don't rush to stick a new lid. Let the alcohol completely evaporate, otherwise the pairs can create a cloudy film on the inside of the new glass or camera. Modern back covers for Xiaomi Redmi Note 7 are often sold already with a factory-painted adhesive layer, closed protective film. This greatly simplifies the process, since you do not need to apply the glue B-7000 or B-6000 on your own, which requires a certain skill. If there is no glue, apply a thin strip of special adhesive around the frame, avoiding getting into the cameras and sensors. Before the final installation, make sure to make sure that you do the new example without the camera licking, it will match the camera with the licking angle. When you are convinced of perfect compatibility, remove the protective film from the adhesive layer. Carefully align the lid with the body, starting on one side (usually on the top or bottom), and smoothly lower it, pressing it down as you move. It's important to keep air out of the glass, so press tightly and evenly. 1 Testing of gaps without glue 2 Degreasing Use of alcohol and napkins 3 Applying/Removing film Carefulness so as not to stain glue 4 When you put the lid in, you need to have a tight fit around the perimeter, and you can use a special clip to repair your phones, or you can just wrap your phone tightly with rubber stationery tapes. Keep the device in a compressed state must be at least 30-60 minutes, or better left overnight for complete polymerization of glue. After the glue is dry and sealed, the moment of truth comes, the test of the health of all systems. First of all, turn on your smartphone and check the response of the touchscreen throughout the area, because if you build the plume of the display, you can damage the plume of the display. Then test the fingerprint scanner: it should read the fingerprint the first time and not require excessive pressure. Special attention deserves the main camera module. In Redmi Note 7, a sensor at 48 MP is used, and if the lens assembly gets dust or into the lens, then test the fingerprint scanner, you will find a few defects in the paper, also make a few good photo points. The glass back cover doesn't screen the signal the way metal does, but poor-quality glue or shifting antenna contacts can impair reception. Test Wi-Fi, Bluetooth and mobile network at different points in the room. 📸 Take test photos to check the purity of the lenses. 👆 Test your fingerprint scanner several times. 📶 Check the signal level of the cellular network and Wi-Fi. 🔊 Make sure the speaker sounds clean (vibration from the build could have knocked the contact off). ⚠️ If after the cover has been replaced, the phone can no longer see SIM-If you've lost a map or a sound, you may have damaged or failed to reconnect the antenna plume, which often runs along the frame of the case.Frequent errors and care tips Even following the instructions, beginners often make mistakes that can cost the device life. One of the most common is the use of superglue (cyanacrylate) instead of special glue for electronics. Superglue releases fumes when frozen, which will break down on the camera lenses and the display, creating an indissoluble white film, and also makes the glass brittle. Another mistake is ignoring the temperature. Trying to remove the lid without proper warming is guaranteed to cause the glass to burst even more, and the fragments to fly through the insides. Conversely, overheating can deform the plastic frame or damage the battery, which can cause it to bloat. After replacing, try not to put the phone under pressure for the first 24 hours: do not put it in the window, if you will only take it with a slag, if you will have to cover, you will use it in the last time with a slash, if you will use it with a slaglaglag, if you will then you will use it in the slag, if you will use it in the cover, if you will then you will use it in the s, if you will use it in the slag it in the slag, if you will then you will be in the s, if you Technically, you can try to remove the surviving part, but it's extremely risky. Glass has the ability to crack further when heated and mechanically exposed. It's easier and safer to buy a new lid assembled than to risk the integrity of the display and the body, trying to save half the broken glass. Does replacing the lid with moisture protection? Factory Assembly Xiaomi Redmi Note 7 does not imply full moisture protection (IP-certification), but the factory glue provides a certain sealing from dust and splash. If you do not use a new size of the same glass for a meter, then you can not apply it to a mile after the same level of repair. Check if the residues of the old glue or plume interfere. If the lid is clearly smaller or larger, it is a marriage, and it is better to return the goods to the seller, since the forced installation will cause skewing and new cracks. Should the frame be changed when changing the glass? In most cases, the frame is not required to change unless it is deformed from the impact. However, if the frame is bent, the new glass lid may not stand in place or burst immediately after installation. Visually assess the geometry: if there are strong dents, the frame is better replaced with the glass.