Smartphone Xiaomi Redmi Note 7 remains one of the most popular devices in the secondary market and in the segment of budget solutions, but over time its resource inevitably depletes. The most common reasons for contacting a service center are a battery that discharges within a couple of hours or a cracked display after a fall. Many users, wanting to save money, decide to do their own repairs, but often do not know which side to approach the case from without breaking it.
Procedure showdown This device has its own specific features related to the design of the case and the method of fastening the internal components. Unlike older models, it uses an adhesive bond, which requires patience and proper heating. Incorrect actions can lead to damage to the cables or deformation of the metal frame, which will make further operation impossible.
In this article, we will analyze in detail each stage of dismantling, point out critical pressure points and tell you which tool is really necessary for a successful operation. You'll learn how to carefully remove the back cover without damaging the sensors, and how to replace major components without risking the electronics.
Preparing tools and workspace
Before you start touching the device itself, you need to organize a comfortable workplace and prepare a set of specialized tools. The quality of disassembly directly depends on what you will be working with: ordinary screwdrivers from a kitchen set can scratch the screws or tear off the slots, which will significantly complicate the process.
You will need a set of precision screwdrivers, always including a Phillips head PH00 And PH000. To work with glue, a hair dryer or a specialized thermal soldering station with temperature control will be indispensable. Also, don’t forget about the plastic picker and glass suction cup.
- 🔧 Screwdriver set (phillips and flathead, size 00 and 000)
- 🌡️ Construction hair dryer or heat gun (temperature up to 100°C)
- 🪜 Plastic picks and cards for separating bodies
- 🧲 Magnetic mat for sorting screws of different sizes
- 🧴 Isopropyl alcohol to remove glue residue
The work surface should be clean, well lit and free of unnecessary objects. Small screws tend to roll around the table and get lost, so having a magnetic mat or a regular box with cells will be your salvation during the work process.
It is also important to take care of protection against static electricity, especially if you work in a dry area in winter. It's best to wear an antistatic wrist strap or at least periodically touch a grounded metal object to remove the charge from your hands before touching the motherboard.
Removing the rear glass cover
The first and most important step is to remove the back cover, which is made of tempered glass and tightly glued to the metal frame. Manufacturers use a powerful adhesive composition that can withstand heavy loads, but at the same time makes dismantling difficult without heating.
Turn on the hairdryer and heat the edges of the back cover around the perimeter. Do not hold the nozzle too close to the glass to avoid overheating it and causing a crack. The optimal temperature for softening the glue is about 70-80 degrees, this will take about 3-5 minutes.
Once warmed up, use a suction cup to slightly lift the edge of the lid and insert a plastic pick there. Slowly move the tool along the edge, cutting through the layer of glue. If you feel strong resistance, do not apply excessive force, but warm up the area again.
⚠️ Attention: When removing the cover, be extremely careful with the fingerprint sensor, which is Redmi Note 7 located precisely in the back cover and connected to the board with a thin cable.
Once you've gone all the way around, carefully lift the lid, but don't remove it completely right away. You will need to unplug the scanner cable to finally remove the cover. Be careful, the cable is quite fragile and can break with a sharp tug.
- 🔥 Warm up the glass evenly around the entire perimeter
- ⚠️ Do not use metal knives instead of picks
- 🔌 Disconnect the scanner cable until the cover is completely removed
If the glue has dried too much and won't budge, you can use a thin string instrument, but this requires great precision to avoid damaging internal components or the display.
- Construction hair dryer
- Specialized station
- Heat gun
- Only heating with a hairdryer at a household level
Removing the inner frame and disconnecting the battery
After removing the back cover, you will have a view of the battery, motherboard and other components. The first step is to remove the metal protective frame that covers the board and screws. It is secured with several screws of different sizes that need to be carefully unscrewed.
It is critical to disconnect the battery immediately after removing the frame. This is a standard safety procedure that prevents short circuits during further manipulation of other loops. The battery connector is located in the center of the board and can be easily snapped off.
The screws holding the frame in place may vary in length, so be sure to remember or write down which screw goes where. Mixing up long and short screws can cause damage to the board when tightened, as the long screw may hit a trace or component.
⚠️ Attention: Never try to unscrew the screws while they are still under load or if they are rusty, use special liquid thread impregnation agents.
Loosen all screws, remove the frame and carefully disconnect the battery connector. Now you can safely work with other display cables, touchscreen and other modules without the risk of burning the motherboard.
- 🔩 Record the length and location of each screw
- ⚡ Disconnect the battery immediately after removing the frame
- 🛡️ Use plastic spatulas to remove the frame
Sometimes screws can be hidden under stickers or caps, so carefully inspect all corners and cutouts in the frame before you begin unscrewing.
☑️ Procedure for disconnecting loops
Replacing the battery and modules
Battery in Redmi Note 7 glued to the body, and replacing it requires patience and the use of special solvents. Do not try to simply pry it off with a screwdriver, as there is a high risk of puncturing the battery, which will lead to a fire or chemical burn.
Apply a little isopropyl alcohol or special adhesive solvent under the edges of the battery. Allow the solution to soak in for a few minutes to allow the adhesive to lose its properties. Then use plastic spatulas to slowly and gradually peel off the battery.
When replacing other modules, such as the charging connector or vibration motor, pay attention to the cable clamps. They often have a characteristic latch that must be carefully bent upward before pulling out the connector.
If you are replacing the display module, please note that it is also glued to the case. Old glue must be completely removed from the frame using alcohol and a plastic spatula before applying new double-sided tape.
- 🧪 Use only alcohol solvents for glue
- 🔋 Do not use sharp metal objects to remove the battery
- 🔧 Handle cable clamps carefully
- 🧼 Clean the frame of old glue before installing a new module
After installing a new battery, do not rush to assemble the phone right away. It's best to leave it for a couple of hours for the glue to set and then test.
How to check battery performance?
First, connect the battery cable without inserting the board into the case. Turn on your phone and check charging and discharging in standby mode. If everything is in order, you can assemble the device completely.
Table of screws and their locations
To successfully assemble the device, the order and length of the screws must be strictly observed. Below is a table that will help you navigate when disassembling and assembling your smartphone.
| Position | Screw size | Quantity | Features |
|---|---|---|---|
| Fastening the frame | 1.5 mm | 7 pcs. | Short, black |
| Mounting the board | 2.0 mm | 3 pcs. | Medium, black |
| Speaker mount | 1.0 mm | 2 pcs. | The shortest |
| Camera mount | 1.2 mm | 1 piece | One screw |
| Connector fastening | 1.5 mm | 1 piece | Near the speaker |
Using screws that are not the right size may result in them not being screwed in completely or, conversely, piercing the board. Always check the chart before tightening.
Pay special attention to the screws securing the speaker and charging connector, as they are the shortest and can easily be confused with the longer frame screws.
Correctly sorting the screws is 90% of the success when assembling a smartphone, avoid rushing at this stage.
Final assembly and check
Once all components have been replaced and installed, begin reassembly. First, connect all the cables to the motherboard, making sure they snap all the way into place. Then screw on the protective frame and tighten the screws.
Before gluing the back cover, check the operation of the phone: turn it on, check the charging, the operation of the camera, speaker and fingerprint scanner. If everything works properly, you can apply a new layer of glue to the body.
Apply a bead of glue around the perimeter of the frame, avoiding the holes in the speakers and microphones. Place the back cover and press it lightly so that the glue is distributed evenly.
For better grip, you can fix the phone in a vice with soft jaws or use special clamps for 30-60 minutes until the glue completely hardens.
- 🔌 Check the operation of all modules before final gluing
- 🧴 Apply glue carefully, without excess
- 🤏 Use clips to secure the lid
If you did everything correctly, the phone will look like new and its characteristics will be restored to factory levels.
Before applying glue, wipe the surface of the frame and cover with an alcohol wipe to remove dust and grease, this will improve adhesion.
Common mistakes and how to avoid them
Many novice craftsmen make the same mistakes when disassembling Redmi Note 7. The most common problem is haste when removing the back cover, which leads to cracks in the glass or damage to the scanner cable.
Another common mistake is incorrect installation of screws. If you screw a long screw into a short hole, it can damage the traces on the board or even pierce through it. This often leads to the device not working.
You should also avoid using too strong magnets near your phone, as they can damage the sensors or magnetic components in the speaker and vibration motor.
⚠️ Attention: Do not leave the phone turned on during disassembly, this may lead to accidental short circuit and failure of the power controller.
If you feel like you can't cope, it's better to stop and turn to professionals. Repair at a service center may cost less than buying a new phone after an unsuccessful attempt on your own.
Remember that the build quality and reliability of the device directly depend on the accuracy and precision of your actions. Any careless move can cost you your entire smartphone.
Is it possible to disassemble Redmi Note 7 without a hair dryer?
Theoretically it is possible, using a plastic card and a lot of patience, but the risk of damaging the back cover and fingerprint scanner increases significantly. The glue will not soften without heating, and the force will have to be too strong.
What to do if the battery cable is broken?
In this case, you will need to solder a new connector or replace the entire battery. If you do not have experience soldering small electronics, it is better to entrust this to professionals, as the risk of damaging the board is very high.
How to remove old glue from the case frame?
Use isopropyl alcohol and a plastic spatula. Apply rubbing alcohol, wait a few minutes and carefully remove the adhesive. Do not use metal tools to avoid scratching the paint.
Do I need to change the thermal paste on my processor?
This is not required during standard battery or display replacement procedures. However, if the phone is overheating, replacing the thermal paste may improve cooling, but it requires a deeper disassembly.
How long does complete disassembly take?
For a beginner, the process may take 1 to 2 hours, including heating, dismantling and assembly. An experienced master can do it in 30-40 minutes.