Owners of a popular smartphone Xiaomi Redmi Note 7 Often faced with the need to repair it, be it replacing a broken display, installing a new battery, or trying to save the device after falling into water. The design of this device, despite its reliability, requires a careful approach when dismantling, since the manufacturer used a multi-glued assembly.
The process of opening the case Redmi Note 7 significantly different from disassembling older models, where it was enough to unscrew a few screws. Here the emphasis is on the adhesive materials that hold the back cover in place, which requires specialized equipment and patience. If you plan to do the work yourself, you will have to master the skills of working with a hair dryer and thin picks.
Preparing tools and work area
Before proceeding with actual disassembly Redmi Note 7, it is necessary to create the right conditions and prepare a set of tools. Failure to use the correct tools may result in permanent damage to the chassis or internal components, making further repairs impossible or extremely expensive.
You will need a heat gun or a special heat-resistant pad to warm up the glue. It is also necessary to have plastic picks or flexible blades that will not damage the plastic frame of the case. Don't forget about a set of screwdrivers, where the key bits will be Phillips P2 and P00 for screws under the speaker.
- 🔥 Heat hair dryer with temperature control (up to 80-90°C) to soften the glue.
- 🔧 Precision screwdriver set including thin Phillips screw bits.
- 🪜 Plastic picks and flexible paddles for safe release of the lid.
- ⚡ Magnetic mat for sorting small screws and parts while working.
Organize your workspace so that the lighting is bright and even, and all tools are at hand. This will avoid losing small fasteners that could accidentally fall to the floor or get stuck inside the device body.
Disconnecting the battery and removing the back cover
The first and most critical step is to disconnect the battery. Even if the phone is turned off, when connected to the network or accidentally pressing buttons on the board, a short circuit may occur, which will damage the power controller or processor.
First you need to warm up the rear glass panel around the perimeter. Heating should be uniform, the glue temperature should not exceed 80-85°C, otherwise the glass may crack due to thermal shock. Slowly and smoothly move the hairdryer around the edges of the body, paying special attention to the corners.
⚠️ Warning: Never try to pry the lid with a screwdriver or metal tool at this stage - you are guaranteed to break the glass or scratch the aluminum frame into holes.
Once warm, use a plastic pick to begin to separate the cap from the body. The movements should be sliding, as if “sawing” the layer of glue. Walk around the entire perimeter, gradually going deeper inside.
- 🌡️ Heat the glass evenly, avoiding local overheating in the center of the module.
- 🛡️ Use soft plastic spatulas to minimize the risk of damage to the cables.
- 🔌 Immediately after removing the cover, disconnect the battery cable from the motherboard.
Pay special attention to the area under the speaker where the mounting screws are hidden. They need to be unscrewed only after the cover has been lifted, so as not to damage the speaker itself or the vibration cable.
- Hairdryer only
- With hairdryer and spatulas
- I use a vacuum suction cup
- I don't know what I need yet
Removing internal components and modules
After removing the back cover and disconnecting the battery, the internal structure will be revealed to you Redmi Note 7. At this stage, it is important to follow a strict sequence of actions so as not to damage the fragile cables and connectors connecting the various modules.
First, remove the protective metal plate that covers the main connectors on the motherboard. It is secured with several screws, which must be carefully unscrewed and placed in a separate container. Under the plate you will see the display, touchscreen and battery connectors.
If your goal is to replace the battery, then note that it is glued to the case with two strips of double-sided tape. To remove it, you can use the “thread cut” method or carefully pry it off with a spatula, after warming up the area around the battery.
☑️ Procedure for dismantling modules
Be extremely careful when working with the motherboard, as it is attached to the case through special plastic stands and screws. Any careless movement may cause the pads to come off.
- 🔩 Unscrew the screws strictly diagonally to avoid skewing the protective cover.
- 🔌 Disconnect the cables by prying them with a plastic spatula on the special tongues.
- 🔋 Remove the battery only after it has been pre-warmed and the glue has softened.
Replacing the battery and troubleshooting power issues
Replacing the battery in Redmi Note 7 - one of the most frequent operations, since over time the capacity of the lithium-ion cell inevitably decreases. An old battery can swell, which poses a real threat to the integrity of the glass and the safety of the user.
The new battery must be installed after first clearing the seating area of any remaining adhesive. Use isopropyl alcohol and a soft cloth to avoid damaging the contacts or adjacent components. Apply new double-sided tape to the bottom of the case.
⚠️ Attention: If you see swelling of the old battery, do not press or pierce it under any circumstances - this may cause a fire or chemical burn.
Install the new element, making sure that the cable is correctly inserted under the protective plate. Before assembly, be sure to check that all connectors are secure and that the cables are not distorted, which could prevent the lid from closing.
Cheap analogues may have low capacity or unstable operation of the charge controller.
Features of installing the battery in Redmi Note 7
Unlike some other models, here the battery has a specific shape with a protrusion in the camera area, which requires precise alignment during installation.
After installing a new battery, it is recommended to check its operation before completely reassembling the case by connecting the device to the charger and making sure that the charge indication appears correctly.
A high-quality battery replacement requires not only the purchase of a new element, but also careful preparation of the seat and checking all connectors before final assembly.
Diagnostics and replacement of the display
Replacing the display module in Redmi Note 7 - a task more complex than replacing the battery, since it requires dismantling the upper part of the case and working with fragile cables. Often users encounter a problem when only the glass is broken, but the matrix is intact, but replacing the entire module assembly is the most reliable option.
To remove the display, you must first remove the front panel. However, in Redmi Note 7 The display is glued to the frame, and removing it requires heat, similar to the process of removing the back cover. Use a hair dryer to heat the perimeter of the front panel.
Carefully pry the display with a plastic spatula and remove it from the frame. Be prepared for the fact that the glue holds very tightly, and you will have to make an effort, but without fanaticism, so as not to damage the matrix.
- 📱 Heat the front panel evenly, avoiding overheating the area under the volume buttons.
- 🔧 Use thin spatulas to separate the display from the aluminum frame.
- 🔌 Disconnect the display cables only after it is completely separated from the case.
When installing a new display, make sure that all cables are connected tightly and secured with special latches. Check the touchscreen operation and image display before final assembly.
Before purchasing a new display, be sure to check whether it is AMOLED or LCD, as they have different connectors and thicknesses, which may affect compatibility.
Elimination of the consequences of moisture ingress
If your Redmi Note 7 got into water, you need to act immediately. Although it is certified waterproof, it is not an absolute guarantee, especially after falls or prolonged contact with liquid.
First, remove the SIM card and memory card to avoid contact corrosion. Turn off the device and under no circumstances try to turn it on to check its functionality - this may short the contacts and kill the board.
Disassemble the smartphone following the instructions above and thoroughly dry all internal components. Use compressed air to remove moisture from hard-to-reach places and alcohol wipes to wipe off salts and dirt from contacts.
⚠️ Attention: Do not use a hair dryer on hot air mode - high temperatures can melt the glue and damage the plastic parts.
After complete drying, reassemble the device and try turning it on. If the problem persists, the board may need to be professionally cleaned in an ultrasonic bath or damaged components replaced.
It is important to note that traces of corrosion may appear over time, so even after successful operation of the device, it is recommended to periodically check the condition of the contacts.
Why you can't turn on a wet phone
When power is applied to a wet board, electrolysis occurs, which instantly corrodes thin traces and contacts, making repairs impossible.
Assembling the case and checking functionality
The final stage is assembling the body. It is important to follow the order in which all parts are installed and securely fix them. Use new screws or make sure the old ones are not stripped.
Before gluing the back cover, apply a new layer of hot melt glue or double-sided tape around the perimeter. Make sure that all cables are neatly laid out and not pinched. Close the lid and press it around the perimeter for 2-3 minutes for initial fixation.
| Component | Number of screws | Screw size | Special Notes |
|---|---|---|---|
| Board protection plate | 5 | P2 (short) |
Attaches to motherboard |
| Speaker and microphone | 2 | P00 (very short) |
Hidden under the back cover |
| Volume buttons | 1 | P2 (long) |
Attaches to case frame |
| Charging connector | 2 | P2 |
Attaches to the bottom of the case |
| Camera module | 1 | P2 |
Attaches to the back cover |
After assembly, check the operation of all buttons, proximity sensors, speaker and microphone. Make sure that the screen responds to touches across the entire area and there is no flickering.
If all functions work correctly, the device can be put into operation. Remember that proper assembly is the key to long and stable operation of your smartphone.
- ✅ Check the operation of all buttons and sensors before finally fixing the cover.
- 🔋 Make sure the battery fits snugly and is not distorted.
- 📱 Test the connection, Wi-Fi and GPS before handing over the device to the owner.
How long does it take to disassemble Redmi Note 7?
Disassembly takes from 30 to 60 minutes depending on the experience of the technician and the condition of the device. A beginner may need more time to warm up the glue and carefully remove the components.
Do I need to change the glue during assembly?
Yes, definitely. Old glue loses its properties after heating and dismantling. The use of a new adhesive will ensure the tightness and reliability of the back cover.
Is it possible to replace the battery without disassembling the display?
Yes, in Redmi Note 7 The battery is located under the back cover, so there is no need to remove the display unless it needs to be replaced or the camera module needs to be repaired.
What to do if the screws are broken?
Use special bits for stripped screws or the rubber method. In extreme cases, you will have to drill out the screw, but this requires high precision and special equipment.
How to check the functionality of the cables after disassembly?
Connect the device to the charger and check the indication. Then turn it on and test all functions: camera, sound, sensor and communication.