Xiaomi Redmi Note 7, released in early 2019, has established itself as the “king of the budget segment”, but even the most reliable technology over time requires intervention. Most often, users face the need to replace a broken display glass or a failed battery. The process of disassembling the device is not trivial, since the design of the case involves the use of a large amount of glue and the absence of classic screws on the external frame.
Before we take action, we need to be clear about the risks. Any carelessness with a lithium polymer battery or thin plumes can cause permanent damage. Our goal is to guide you through this process as safely as possible, keeping all modules functional. In this article, we will take a detailed look at each stage of dismantling, from tool preparation to final assembly.
It's important to note that self-disassembly almost always leads to the loss of the official warranty if it was still in place. However, for a device that's several years old, it's often the only cost-effective way to restore performance. Prepare a workplace with good lighting and be patient, because the fixation of components in this model is very tight.
Preparation of the workplace and necessary tools
The success of any electronic repair operation depends on 80% of the quality of preparation. To disassemble the Redmi Note 7, you will need a specific set of tools that differs from the standard PC kit. First of all, we are talking about heating elements, since the back cover is fixed to a powerful layer of glue. Without pre-warming, it is almost impossible to open the case without damage.
The second critical aspect is the organization of space: small screws of different sizes are easy to confuse, and installing them in the wrong holes can damage the motherboard. It is recommended to use a magnetic mat or organizer with cells, signing each step of the fastener unscrewing, which will save you hours of time when you build it back.
⚠️ Attention: The use of an open fire (gas stove, lighter) to heat the body is strictly prohibited! OLED-Use only controlled heat sources, or cause the battery to bloat.
Below is a list of equipment that will ensure safe and efficient operation:
- 🔥 Hair dryer construction or special heating pad (temperature) 80-100°C)
- 🔧 Set of screwdrivers (cross-haired) PH000, PH00 flat)
- 💳 Plastic blades and mediators for opening
- 🧲 Tweezers with dielectric legs
- 🧴 Isopropyl alcohol and sucker
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Use isopropyl alcohol 90%+ concentration. It dissolves glue perfectly and evaporates quickly, leaving no conductive traces on the board.
Removal of the back panel and primary access to the insides
The first step is to remove the tray for SIM-This is a must, because if you have a tray inside the housing when you heat it up, it can become warped or stuck, and if you remove the tray, you need to warm up the perimeter of the back cover, and distribute the heat evenly over all the edges over the course of the day. 2-3 minutes, constantly checking the temperature with your hand so as not to overheat the glass.
When the body is warm to the touch, you can start creating a gap. Carefully insert the suction cup at the bottom of the back cover, closer to the logo, and slightly pull up. At the same time, you need to insert a plastic blade into the resulting microscopic slit. Move the tool along the perimeter, cutting the adhesive layer. The back panel is removed completely, opening access to the main board and battery.
So right after you take the lid off, you'll see a plastic shield covering the top of your smartphone, and it's also glued and screwed, and don't try to pull it off with a jerk, you'll need to twist all the screws you can see around the perimeter, and then you can gently peel the plastic off with a thin tool.
Dismantling the battery and disconnecting the plumes
Once you remove the top plastic panel, you'll have access to the motherboard and the battery, and the first thing you have to do is to disconnect the battery plume from the board, and this will power the device down and prevent short circuits from being shorted out as you manipulate other components further.
The battery in the Redmi Note 7 is attached to double-sided tape and additionally fixed with plastic tongues. To remove it, it is recommended to use a special pulling tongue (if it is provided by the design) or gently tamper with the battery with a plastic card on the bottom. Do not use metal tools to tamper with the battery, as puncture of the shell will cause ignition.
If the battery is very tight, you can slightly warm up the back of the case in the battery area (no longer having a back cover) on the heating pad. This will soften the glue. Once the main board plume is disconnected, you can remove the power module itself. Notice the location of the plume connecting the bottom board to the main board, which runs under the battery.
⚠️ Warning: If the battery is swelling, do not press on it or heat it too much. Remove it with utmost care, avoiding any mechanical damage to the cell housing.
Replacement of the display module and removal of the frame
The screen replacement in the Xiaomi Redmi Note 7 often requires a complete dismantling of the internal bezels, since the display module is glued into it. This is the most difficult step, requiring jewelry accuracy. First, you need to unscrew all the screws that attach the metal frame to the plastic median and remove the bottom board (dynamics).
Then there's the process of separating the frame from the broken screen, the frame is glued around the perimeter, heat the front of the device (screen) on the heating pad to a temperature of about 60-70 degrees, use a thin string or a special fishing line to "re-saw" the layer of glue around the perimeter, separating the frame from the broken glass.
Once the frame is successfully separated, it must be thoroughly cleaned of the residues of old glue. A new frame or new module (if assembled) is applied to a special adhesive B-7000 or already applied to the factory tape. Combine the frame with the new display, making sure that all the holes match, and press tightly around the perimeter.
| Component | Type of attachment | Risk of damage | Tool. |
|---|---|---|---|
| Back cover. | Clay. | Tall (cracks) | Fryer, sucker. |
| Battery | Scotch 3M | Critical (fire) | Plastic card |
| Display module | Glue + frame | Tall (cracks) | String, hair dryer |
| Maternity fee | Screws + plumes | Medium (steer break) | Screwdriver, tweezers. |
Working with motherboard and cameras
Removal of the motherboard is rarely required, usually when replacing the charging connector or repairing power chains.The board in the Redmi Note 7 is closed with a metal screen that can be welded or glued.It is not recommended to remove this screen without special equipment unless you have soldering skills.
To remove the board, you need to disconnect all the plumes: the main plume (under the battery), camera plumes, buttons and display. The cameras are fixed in the slots and can be additionally glued. Remove them vertically upwards, avoiding distortions that can damage the lenses or contacts.
When you reverse-mount the board, make sure all connectors are snapped to the characteristic clicks.The display plume is one of the most vulnerable elements - it's easy to break or damage the contacts when sloppy build. Use a magnifying glass or magnifying glass to control the fitting of the connectors.
Why doesn’t the phone turn on after assembly?
Assembly of the device and verification of functionality
The final step is to build in reverse order, start by putting the battery in place and connecting the battery plume, and then it makes sense to put the motherboard in place and fix it with screws, and check the touchscreen and the images before you stick the back cover.
Use a quality glue such as the B-7000 to fix the back cover. Apply it in a thin strip on the plastic case, avoiding getting into the camera and speaker. Press the cover with rubber harnesses or a load for 15-20 minutes for initial glue polymerization.
After assembly, be sure to check all the functions: microphone, speakers, vibration, Wi-Fi and cellular communication. Make sure that the proximity sensor is working correctly, otherwise the screen may not go out during the conversation. If all the tests are successful, you can consider the repair completed.
⚠️ Warning: Do not turn on the device if you smell burning or see sparkling. immediately turn off the battery and check the charge for any circuits or improperly installed components.
☑️ Post-repair checks
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High-quality cleaning of old glue and reliable fixation of a new lid is a guarantee that dust and moisture will not get into the smartphone, prolonging its service life.