Introduction to the dismantling process
Smartphone Xiaomi Redmi Note 7 has gained popularity due to its durability, but over time, any gadget may require repairs or replacement of components. Owners are often faced with the need to replace the battery due to loss of capacity or to restore the display after a fall. Self-disassembly allows you to save significant money, but requires extreme care and the availability of specialized tools.
The design of the body of this device has its own characteristics that distinguish it from earlier models in the line. The back cover is fixed with a strong adhesive layer, and inside there are many cables connecting the modules. Incorrect actions can lead to broken conductors or damage to the display glass, so it is important to follow a clear procedure. In this article we will analyze in detail each stage of dismantling, starting from preparing the workplace and ending with the final assembly of the device.
You will need not only physical strength, but also patience, since the process of peeling off the back panel may take time. It must be taken into account that moisture-proof gaskets There are practically no seals on this device, which means that after opening the seal of the case will be compromised. If you plan to keep the phone in its original condition, it is worth purchasing a new adhesive seal or double-sided tape in advance for reassembly.
Preparing tools and workspace
Before you begin physical impact on the body, you need to organize a safe place to work. The table should be clean, well-lit and have a flat surface so that small screws do not get lost in the lint of the fabric. It is best to use a special antistatic mat, which will prevent the buildup of static electricity that can damage electronic components.
Disassembly tools Xiaomi Redmi Note 7 must be of high quality and suitable in size. The use of cheap screwdrivers often leads to the splines breaking off, which makes reassembly impossible in the future. You will need screwdrivers with a bat P00 or P0 for screws, a plastic spatula for prying off the lid, and a hair dryer for softening the glue.
- 🔧 Precision screwdriver set with bits
P00,P0andPH00 - 🔥 Construction hair dryer or hot hair dryer (temperature 80-100°C)
- 🔪 Plastic spatula (spudge) or pick for opening the case
- 🧲 Magnetic mat for sorting screws of different sizes
- 💉 A syringe with a thin needle to remove glue residue
Don't forget to also prepare isopropyl alcohol and cotton swabs. You will need these items to clean the contacts and remove old adhesive from the frame of your smartphone. If you don't have a hair dryer, you can use a heat gun, but be extremely careful not to overheat the glass of the screen, as this may cause it to crack or warp.
⚠️ Attention! Before starting work, be sure to turn off the device and make sure that the battery is discharged to at least 20-30%. A fully charged battery can ignite if accidentally punctured, and a discharged battery reduces the risk of a short circuit when dismantling the cables.
☑️ List of required tools
Removing the back cover and disconnecting the battery
The first step is to remove the screws securing the back panel. On the bottom edge of the case, next to the USB Type-C port, there are two screws for a Phillips screwdriver. Unscrew them carefully, being careful not to strip the threads, and put them in a safe place. After this, the back cover will still adhere to the adhesive layer, which needs to be softened.
Turn on the hair dryer and direct a stream of hot air towards the edge of the back cover. Keep the hair dryer at a distance of 3-5 cm to avoid overheating the internal components. Warm the corners and edges around the perimeter for 3-5 minutes, periodically checking the temperature with your finger. The glue should become soft and pliable, which will allow the glass to be separated from the aluminum frame without damage.
After warming up, carefully insert a plastic spatula into the gap between the frame and the back cover. It is best to start from the bottom edge, where the screws have already been unscrewed. Smoothly move the spatula along the side edges, shaking it slightly to cut through the layer of glue. Do not use excessive force as the glass may crack if moved suddenly.
- 🌡️ Warm up the corners of the case for at least 2 minutes each
- 🔪 Move the shoulder blade slowly and smoothly, avoiding sudden jerks
- 👀 Make sure that the spatula does not go deeper than 3-4 mm
Once the lid is completely detached, lift it up and set it aside. Immediately after removing the cover, you must disconnect the battery from the motherboard to de-energize the device. This is a critical step that will prevent short circuits when other cables are disconnected.
Locate the metal plate covering the cable connectors. It is secured with one screw. Unscrew it and remove the plate. Below it you will see the battery connector. Carefully pry it up with a plastic spatula and remove it. Now the phone is completely safe for further disassembly.
What to do if the cover does not come off?
If the lid still does not budge after warming up, do not force it. Warm up the problem area again and try injecting some isopropyl alcohol into the gap using a thin needle. The alcohol will dissolve the glue and the lid will come off easier.
Removing internal components and modules
After turning off the power, you can proceed to removing the main modules. First of all, remove the board that covers the cable connectors and secures the battery. Unscrew all the screws holding this plate in place and carefully remove it. Please note that some screws may be different lengths, so remember their locations or use a magnetic mat.
Battery in Xiaomi Redmi Note 7 glued to the body using double-sided tape. To remove it without damaging it, you need to pry the edge with a spatula and gently pull it up, while simultaneously warming the bottom of the battery with a hairdryer. You can also use special adhesive tapes if they are included, but the mechanical method with heating is often more effective.
The next step is to remove the vibration motor and speaker module. They are also fixed with screws and glue. Unscrew the fasteners and disconnect the cables from the motherboard. Be careful with the speaker cable, as it runs close to the charging connector and can be easily damaged if moved carelessly.
- 🔋 Remove the battery, gradually warming it up from below
- 🔊 Remove the speaker by first disconnecting the cable
- 📷 Unscrew the screws securing the camera module and remove it
The motherboard is also secured with several screws and cables. Disconnect all connectors, including the display cable, touchscreen cable and charging connector. After this, unscrew all the screws holding the board and carefully remove it. There may be cameras and other small components on the board, so be extremely careful.
⚠️ Attention! When disconnecting the display and touchscreen cables, make sure that you press the latches and do not pull the wire itself. Poor quality connectors can break if too much force is applied.
Accuracy when disconnecting loops is the key to successful work. Damage to the contacts on the motherboard can cause the entire device to malfunction.
Screw size table and location
To properly assemble your smartphone, it is important to know the exact location and length of each screw. IN Xiaomi Redmi Note 7 There are several types of fasteners used, and confusion can result in damage to the chassis or components. Below is a table with the main groups of screws and their characteristics.
| Localization | Quantity | Screw type | Length(approx) |
|---|---|---|---|
| Bottom edge (at the USB port) | 2 pcs. | P00 | 3.0 mm |
| Battery mounting board | 1 piece | P00 | 2.5 mm |
| Loop fastening board | 4 pcs. | P00 | 2.0 mm |
| Speaker module | 2 pcs. | P00 | 2.5 mm |
| Motherboard | 6-8 pcs. | P00 | 2.0-2.5 mm |
Following this table will help you avoid assembly errors. If you are using a magnetic mat, place the screws in the appropriate slots and label their locations. This will save time and stress when it comes time to put the device back together.
Please note that some screws may be coated with paint or have special markings. Do not try to unscrew them with excessive force, as this may lead to the splines breaking off. If the screw does not budge, try using a drop of alcohol to clean the threads or lightly tap the screwdriver.
Replacement of components and reassembly
After all components have been dismantled, you can begin to replace them. Install a new battery, having first cleared the place where it is attached from the remnants of old glue. Apply new double-sided tape or special battery adhesive. Make sure that the battery fits snugly against the case and is not distorted.
Install the motherboard and secure it with screws. Connect all cables in the correct order, starting with the battery connector. This is important to ensure that all contacts are securely secured. Install the metal plates and tighten the screws, but do not over-tighten them to avoid damaging the threads.
When installing the back cover, apply new adhesive seal around the perimeter of the case. Gently press the cover onto the frame and hold it there for a few minutes to allow the adhesive to set. Then heat the edges with a hairdryer and press them again to securely fix them.
- 🔧 Use new glue for the back cover and battery
- 🔌 Connect cables only after installing the boards
- 📱 Check the functionality of all functions before complete assembly
After assembly, turn on the device and check the operation of all modules. Make sure the screen responds to touch, the speaker produces sound, and the camera captures an image. If everything works properly, the repair can be considered complete.
Before complete assembly, turn on the phone and test all functions without closing the back cover. This will avoid repeated disassembly in case of malfunctions.
Common mistakes and how to avoid them
One of the most common mistakes is using excessive force when peeling off the back cover. Glass Xiaomi Redmi Note 7 It is quite fragile and can crack if moved suddenly. Always heat the glue and use plastic tools to avoid damaging the case.
Another common mistake is incorrect connection of cables. If the cable is not inserted fully or at an angle, the contacts may oxidize or come off over time. Make sure that the latch snaps into place and that the cable fits snugly into the connector.
Also worth noting is the problem with losing screws. Small screws get lost easily, especially if they fall on the floor. Use a magnetic mat and always keep the screws in one place. If you lose a screw, do not attempt to reassemble the phone without it as this may cause vibration and damage to components.
⚠️ Attention! Do not attempt to use metal tools to disconnect cables. This may cause a short circuit and damage the motherboard.
- Peeling off the back cover
- Disabling loops
- Search for spare parts
- Housing assembly
FAQ: Answers to popular questions
Is it possible to disassemble Xiaomi Redmi Note 7 without a hair dryer?
Technically possible, but highly not recommended. The adhesive that holds the back cover in place is very strong. Without warming up, you risk breaking the glass or deforming the case. If you don't have a hairdryer, you can try using hot water, but this is less effective and takes more time.
Do I need to disconnect the battery before replacing the screen?
Yes, this is a prerequisite. Disabling the battery prevents a short circuit that could occur when the display cable is disconnected. Ignoring this rule may result in serious damage to the motherboard.
How to properly dispose of an old battery?
Old lithium-ion batteries should not be disposed of in regular trash. Take them to specialized electronics collection points or stores that have battery recycling containers. This is important for the safety of the environment.
What should I do if the phone does not turn on after disassembling?
Check the connections of all cables, especially the battery connector. Make sure the screws are tightened correctly and the contacts are not damaged. If the problem is not solved, it is possible that a component was damaged during disassembly and will require diagnostics at a service center.
How long does it take to disassemble Redmi Note 7?
For a beginner, the process can take from 40 minutes to an hour. Experienced professionals can do it in 20-30 minutes. The time depends on skill, quality of tools and condition of the device (for example, the degree of wear of the glue).