Smartphone Xiaomi Redmi 7 has proven to be a reliable budget device, but over time, even the strongest equipment requires intervention. Owners often face the need to replace a broken display, worn-out battery or failed charging connector. Self-disassembly gadget can save a significant amount of money on the services of the service center, if you perform all the actions carefully and consistently.
Before you start, you need to understand that opening the case automatically voids the manufacturer's warranty. If your device is still in warranty service, it is better to contact an authorized service. However, if the warranty has already expired or the case is non-warranty, a competent approach to the case will bring the phone back to life. The main thing is to take your time and prepare all the necessary tools in advance.
In this article, we will take a closer look at all the steps of dismantling the Redmi 7, focusing on hidden screws and brittle plumes. You will learn what nuances the design of this particular machine has and how to avoid common beginner mistakes. Proper preparation of the workplace is already half the success in electronics repair.
⚠️ Warning: Before starting any work, be sure to completely turn off your smartphone. Working with the battery on increases the risk of short circuit and damage to the motherboard.
Tools and workplace preparation required
Good workplace preparation is critical to successful repairs: you'll need a spacious table with good lighting to see the smallest details and screws, and the surface should be clean and preferably covered with a special antistatic mat or at least a regular fabric so that small screws do not get lost and scratch the case.
The Xiaomi Redmi 7 will require a specific set of tools that are not always in a standard home first aid kit, such as a suction cup to lift the back cover and a set of metal blades or mediators to snap the latches, and a hairdryer to soften the glue that holds the back panel.
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Use a magnetic mat or spread out the screws in order of their extraction on a sheet of paper with a drawn diagram - this will help not to confuse fasteners of different lengths during assembly.
Here is a complete list of what should be on hand before starting the procedure:
- 🔧 Set of screwdrivers (cross-haired) Ph000 flat)
- 🔥 Hair dryer or heating platform (temperature) 80-100°C)
- 💳 Plastic card or mediator for opening
- 🧲 Glass lifting suction cup
- 🧴 Isopropyl alcohol or special liquid B-7000
Special attention should be paid to the safety of lithium-ion batteries, damage to the battery shell with a needle or sharp tool can lead to fire, so all manipulations inside the housing are carried out with the utmost care, avoiding sudden movements and pressure on the swelled cells.
Removal of the back cover and dismantling of the main components
The process of opening the Redmi 7 begins with heating the perimeter of the back cover.The glue with which it is glued must soften so that the glass can be separated from the frames without damage.Great the phone evenly throughout the perimeter for 2-3 minutes, constantly checking the temperature with your hand so that the display matrix or the battery itself does not overheat.
After enough warming up, insert a suction cup at the bottom of the back cover, closer to the logo, and slightly pull up to create a gap. Insert a thin plastic blade or mediator into the resulting gap carefully. Do not use metal tools at this stage, as they are very easy to damage the glass or tear the plume of the fingerprint scanner if it is already disconnected but is still inside.
☑️ Preparation for lid removal
Move the blade along the edges, gradually snapping the plastic latches. Pay special attention to the area around the camera and the fingerprint scanner. When the lid is completely free of glue and latches, don't try to remove it immediately. First, you need to disable the fingerprint scanner plume that connects the lid to the motherboard.
The scanner plume is at the top of the device, and you can carefully lift the lid, find the connector, and use the plastic blade to unplug it, and then you can completely remove the back panel, and underneath it you'll see a metal screen covering the main nodes, and the battery itself, which occupies most of the space.
Replacement of the battery and disconnection of plumes
To access most of the internal components, including the battery and the bottom board, you need to remove the metal cover that covers the motherboard and the plumes, which is attached to several screws of different sizes. Unscrew them all and put them away to safety. Once you remove the metal, you will have access to the main connectors.
The first thing you need to do is turn off the battery, which is a critical step to keep you safe, find the battery-to-board plume, and gently snap the connector off with a plastic blade, and never use metal to shut off the battery, so you don't short the contacts.
If you want to replace the battery, you need to remove the old battery after you turn off the plume. In Xiaomi Redmi 7, the battery is planted on double-sided tape. You can use a special pulling tool to extract it, or you can gently tweak the edge of the battery with a plastic card. Sometimes it helps to heat the back of the phone to soften the glue under the battery.
| Component | Location. | Type of attachment | Features |
|---|---|---|---|
| Battery | Central part | Adhesive tape + plume | Requires careful heating |
| Main camera. | Upper left corner | Screw + connector | Fragile module, protect from impacts |
| Lower fees | Down the device | Screws + plume | Contains a charging connector and microphone |
| Dynamician | The bottom part | Screws. | It has a rubber sealer. |
⚠️ Warning: Never pierce the battery case with a tool, which can cause a chemical reaction, smoke and even an explosion of the battery.
How to properly dispose of an old battery?
Dismantling of display and touch screen
Replacing the screen with a Redmi 7 is one of the most common reasons for disassembly. The display module here is glued to the frame, which requires careful dismantling. If you change the screen, you can not save the old frame, but if you plan to reglaze the module in the original frame, the actions must be jewelry.
To remove the display, you have to first remove all the components that prevent access to its plume, which is usually metal protection and disconnect the connector from the motherboard. The display plume is very thin and easily breaks when you carelessly handle it, so pulling it is strictly forbidden.
If you want to remove the module from the frame, use a hair dryer to heat the front around the perimeter, the glue will soften, and you can use a suction cup and a thin string or a plastic card to separate the layers. The process takes time and requires patience, because the glue freezes quickly.
- 🔥 Heat the screen perimeter evenly.
- 🧩 Disconnect the display plume from the board
- 🧪 Use a liquid to dissolve the glue (B-7000)
- 🛠 Carefully pull the module around the edges
When installing a new display, be sure to check its performance before final assembly. Connect the plumes, turn on the phone and make sure that the image is displayed correctly, and the touchscreen responds to touches throughout the area, which will save time for re-disassembly in the event of a marriage.
Working with charging connectors and lower board
Charging problems are a frequent guest of the most popular smartphones. In Xiaomi Redmi 7, the Micro-USB connector is soldered on a separate lower board. This makes repairs easier, since it does not require soldering equipment to replace the socket itself, just replace the entire board.
To access the lower board, you need to remove the back cover and unscrew some screws that lock the plastic platform at the bottom of the case, and you also need to disconnect the plume that connects the lower board to the motherboard, which runs along the battery and is often fixed with additional screws or plugs.
When replacing the lower board, pay attention to the condition of the main plume. If it has cracks or damage, it is also better to replace it, since it transmits microphone and charging current signals. Set a new board, screw it with screws and connect the plume to the characteristic click.
⚠️ Attention: The tail of the lower board is very thin, and when laying it, make sure that it does not fall under the screws and is not clamped by the body, otherwise there may be problems with the charge or operation of the microphone.
Once the components are replaced, put the phone back together, turn the device on and check the charging, the speaker sound, and the microphone, and if all the functions are working properly, the repair is considered complete.
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Replacing the lower board is the easiest type of repair that does not require soldering, and allows you to restore charging in 15-20 minutes.
Assembly of the device and check of performance
The final step is to assemble the smartphone, and it's done in reverse sequence, and you put the internals in, you plug in all the plumes, you screw in the metal, and you make sure that you don't have any screws left over, and all the connectors sit tight.
Before you stick the back cover, make sure you check the phone, turn it on, make a test call, check Wi-Fi, Bluetooth and the camera. If you find an error after gluing it, you'll have to repeat the process again, which can damage the new glue or the integrity of the cover.
Use a special electronics glue (e.g., B-7000 or T-7000) to fix the back cover. Apply a thin layer around the frame perimeter, avoiding the adhesive from the camera, speakers and internal contacts. Press the lid and lock the phone with rubber bands for 15-20 minutes before the initial grip.
It takes about 24 hours to fully polymerize the adhesive, but you can use the phone in an hour. Don't put the device under extreme stress on the first day. A properly assembled Redmi 7 will serve you faithfully for a long time to come.