Smartphone Xiaomi Redmi 4 Note has proven itself as a reliable device, but even the highest quality equipment over time requires intervention. Most often users are faced with the need to replace a broken display, worn battery or failed charging connector. Self-disassembly gadget is a risky but economically justified step that allows you to return the device a second life without overpaying service centers.
Before you start dismantling, you need to be clear that any physical impact on the device can lead to final failure. The internal layout of this device is quite dense, and many components are attached to adhesive. Your task is to act as cool as possible, using a specialized tool and observing safety practices. Errors in the opening phase of the case often become fatal for plumes and motherboards.
In this article, we will take a closer look at the process of dismantling the Xiaomi Redmi 4 Note, paying attention to each screw and hidden bolt. You will learn how to safely disconnect the battery without damaging the conductive tracks, and how to properly unplug the display module.
Preparation of the workplace and the necessary tool
The success of the operation depends on 90 percent proper preparation. You need not just a table, but a well-lit area where there is no air movement that carries small screws. The optimal solution is to use an antistatic mat, although for one-time repairs it is enough to clean, dry surface. Remember that static electricity is the enemy of electronics, so before you start to touch a grounded metal object.
The toolkit should be specialized. A regular hardware shop cross screwdriver can lick the screw heads, because smartphones use special coating and precision screws.
- 🔧 A set of precision screwdrivers (mandatory presence of bits) PH000 and PH00).
- 🔥 Thermophen or professional heating pad for softening glue.
- 🎴 Plastic cards, mediators or thin metal blades (poodgers).
- 🧲 Magnetic mat or container with sections for sorting screws.
- 🧤 Suction cup for careful lifting of the display.
Pay special attention to the heating element. Using a household hair dryer often does not give enough temperature, and an unadjusted building hair dryer can overheat the plastic. The ideal option is a thermo-air soldering station with an exposed temperature of about 80-100 degrees Celsius, enough to soften the adhesive base, but not damage the matrix or polymers of the case.
☑️ Preparation for disassembly
Primary dismantling: Removal of the back cover and battery
The Redmi 4 Note Opening Process Begins With Deletion SIM-This is a critical step that many people ignore when they try to warm the case right away, and if you don't remove the tray, you can damage the tray's mechanism or break the side of the tray when you try to fit the lid. After removing the tray, carefully inspect the perimeter of the device for visible damage that can complicate the process.
Then there's the heating step. You can evenly heat the back cover around the perimeter, lingering at the corners. Don't direct hot air into the center of the back, where the camera and the main nodes are located. You can warm the edges for 2-3 minutes. After heating, insert the suction cup into the bottom of the lid, create a vacuum and slightly pull up, while inserting the plastic card into the gap.
Move the map along the edges, trying not to dive deeper than 3-4 mm, so as not to touch the plumes coming from the buttons or antenna wires. When the lid is clicked around the perimeter, carefully remove it. Now you will have access to the insides, but you can not hurry. The first thing you need to turn off the power.
⚠️ Attention: The first step after removing the lid is to disconnect the battery plume from the motherboard, and ignoring this rule when disassembled further may result in the power controller shorting and failing.
The battery in this model is attached to double-sided tape. It also requires careful heating and the use of a plastic blade. You can only poke the battery at the edge of the opposite plume to avoid damaging it. If the battery is swelling, be very careful: a puncture can cause fire.
What to do if the battery is not removed?
Dismantling the metal screen and access to the board
When the battery is turned off, you can access a metal screen that covers the motherboard and the lower board. In the Xiaomi Redmi 4 Note, this screen is divided into two parts: the upper (main board) and the lower (charging connector and speaker), which are attached to many screws of different sizes and lengths.
You can twist the screws in sequence by grouping them into the place of installation. It's important not to confuse the screws of the board with the screws of the case, because long ones can break through the paths on the board. The metal screen also has the pinplates of the connectors of the display and touch screen. These, too, need to unscrew.
When you remove the metal screens, you have full access to the connectors. Before you disconnect the plumes, make sure you see the locks. This model uses side or top-lock connectors. Click them carefully without pulling the plume.
- 📱 Disconnect the main display plume.
- 👆 Turn off the touchscreen plume (digitizer).
- 🔌 Remove the connector of the front camera and the conversational speaker.
- 🎙️ Turn off the bottom microphone and buttons.
Now the motherboard can be removed. But notice the antenna cable, which goes through special slots in the case and can be glued, and release it carefully by pulling the thickened connector, not the wire itself.
Replacement of the display module and touch screen
The hardest part of repairing the Xiaomi Redmi 4 Note is working with the display. The screen is glued around the perimeter and additionally fixed in the frame. To replace the module (screen + glass + frame), the process is simplified, because you do not need to separate the matrix from the glass. If only the glass changes, you need a separator and a laminator, which is almost impossible to do at home.
Heat the front panel of the device. Keep the temperature within range. 80 degrees so as not to overheat LCD-It's a matrix that can become stained when it's overheated. 5-7 Then use a thin string or line to cut the layer of glue between the frame and the module.
The movements must be smooth, without jerks. The line is turned around the corner and led around the perimeter. After cutting the glue, the module can be removed. Clean the frame from the residue of the old glue with alcohol. Apply a new glue B-7000 or use a finished glue layer (if it comes with a spare part).
| Component | Type of attachment | Difficulty withdrawal | Risks. |
|---|---|---|---|
| Back cover. | Glue + latches | Low. | Plastic cracks |
| Battery | Double-sided scotch | Medium | Puncture, fire. |
| Display module | Perimeter glue | Tall. | Trail rupture, LCD cracks |
| Maternity fee | Screws + connectors | Medium | Contact room |
When installing a new module, make sure the plume is stacked smoothly, without clamping. Press the module against the frame and let the glue grip for 15-20 minutes using rubber rings or load. Don't turn the phone on right away, let the components cool down and take their places.
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Use isopropyl alcohol to clean contacts and remove glue residues. It evaporates quickly and does not conduct current, unlike water or vodka.
Assembly of the device and verification of functionality
The assembly is done in reverse disassembly, but there's an important caveat: before you finally twist all the screws and stick the lid, you have to do an initial check, plug the battery, the display plumes and the touchscreen, and try to turn the device on.
Check the touch screen, the button response, the speakers and the microphone, make sure the camera is focusing, and the Wi-Fi and Bluetooth are catching the signal, and if everything is working correctly, you can start the final assembly, otherwise you have to disassemble the device again to reconnect the connectors.
When you install the back cover, apply a thin layer of B-7000 glue to the plastic frame of the case. Give the glue a little dry (2-3 minutes), then press the cover. For better fixation, you can wrap the phone in rubber rings for 1-2 hours.
⚠️ Warning: Don't twist screws with excessive force.The plastic of the Redmi 4 Note's body is fragile, and a pulled screw can create a stress point that will lead to a crack on the next fall.
Final stage - installation SIM-Make sure there are no wheezing in the speaker and the speaker can hear you clearly. If you've had a speaker replaced during assembly, it might take a burn or just a while for the new membranes to develop.
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Good assembly depends not only on the correctness of the actions, but also on the cleanliness inside the case. Remove all dust and villi before closing the lid.
Typical mistakes and expert advice
Beginners often make the mistake of ignoring the order of screws spinning. At Xiaomi, screws can vary by only half a millimeter in length, but that's enough to screw a long screw into a short hole to punch the board or rest on the touchscreen from the inside. Keep a screw map or use a magnetic mat with markup.
Another common problem is plume damage, and the touchscreen plume in this model is very thin and delicate, and if it moves sloppy, it can break at the base of the connector, and repairing it is only possible in a microscope and soldering hairdryer service, or requires a complete replacement of the module.
Don't forget the moisture protection. Once built, the phone has minimal dust protection. When disassembled on its own, the leakiness is broken. If you're often in a wet environment, consider applying a special hydrophobic coating on the board, although that won't be a full guarantee.
- 🚫 Do not use metal tools to crack plastic latches.
- 🌡️ Do not overheat the body above 100 degrees.
- 🔋 Do not try to charge the swelled battery.
- 🧼 Do not use water to clean the board, only alcohol.
Compliance with these simple rules will allow you to successfully repair and extend the life of your gadget.Electronics repair is a skill that comes with experience, so the first time can take longer than expected.