Disassembly Xiaomi Redmi Note 4: detailed instructions with nuances

The Xiaomi Redmi Note 4 is one of the most popular smartphones of 2017 and is still in use today, but over time, even such a reliable device can require repairs, from replacing the battery to cleaning the connectors or recovering from a fall. If you decide to disassemble the device yourself, it is important to do so carefully so as not to damage fragile components.

In this article, you will find a step-by-step photo instruction, a list of tools you need, and critical warnings to help avoid typical errors. We will look at both the standard disassembly for replacing the battery or speaker, and the nuances of working with the Redmi Note 4 (including versions with the Snapdragon 625 and Helio X20 processor).

Before you start, consider your own strength: disassembling a smartphone requires patience and accuracy. If you've never held a T3 screwdriver or tweezers, you might want to go to a service center. But if you're ready, go ahead!

Preparation for disassembly: tools and security measures

The first step is to assemble everything you need, and without the right tools, you risk damaging plumes, leaving scratches on the body, or even breaking the mounts.

• 🔧 Torx screwdriver T3 (magnetically-tipped!).
• 📱 Plastic blades (2-3 (a) or mediators for disengaging the shell.
• 🧲 Tweezers (better curved, for working with small details).
• 🔋 Dryer or thermo-air station (if you plan to unplug the battery).
• 🧴 Isopropyl alcohol 90%+ clean-up.
• 📦 Container for screws (so as not to lose small parts).

Also, prepare the workspace: the desk should be clean and well lit, it is advisable to use an antistatic mat or at least touch an earthed object before work to remove static electricity.

⚠️ Note: If your Redmi Note 4 has been in water or has been hit hard, disassembly can be more dangerous than usual. Corrosion on the board or microcracks in the display glass can lead to unpredictable consequences (for example, short circuit when connecting the battery).

Before starting work, completely turn off the smartphone and remove it. SIM-If the battery is swelling, don't try to puncture or bend it, it could cause a fire.

Step 1: Removing the back cover

The Redmi Note 4 body is glued around the perimeter, so removing it will require careful heat exposure. heat the edge of the smartphone with a hair dryer (~60°C) for 2-3 minutes to soften the glue. Do not direct hot air to the display or camera!

Then proceed as follows:

1. Insert a plastic blade into the gap between the case and the screen at the charging connector.
2. Carefully drive the blade along the edge, separating the lid, and if you feel resistance, warm up the place again.
3. As soon as the lid begins to move away, do not pull it sharply: under it there are plumes of the fingerprint scanner and antennas.

At this stage, many people make the mistake of trying to disconnect the lid completely before the plumes are turned off. This can cause them to break! Once the lid is raised by 1-2 cm, move to the next step.

Step 2: Turn off the plumes and battery

Under the lid, you'll see a battery that's black-filmed and some plumes, and the first thing you need to do is turn off the battery to avoid short circuits.

1. Unscrew two T3 screws that fix the metal plate above the battery plume (it is located at the top of the smartphone).
2. Carefully attach the battery connector (white connector) with a plastic spatula and disconnect it.

Now you can turn off the other plumes:

• 📸 Main camera plume (black, in upper left corner).
• 👆 Fingerprint scanner plume (thin, under the battery).
• 📶 antenna plume (may be glued, disconnect gently!).

If you plan to replace only the battery or speaker, you can stop at this stage. For a complete disassembly (for example, to replace the display or motherboard), you will need to remove the metal screen that covers the internal components.

⚠️ Note: Fingerprint scanner on Redmi Note 4 If it's damaged, the fingerprint sensor will stop working and it will cost you to replace it. 30-50% smartphone.

Step 3: Removing the battery

The battery in the Redmi Note 4 is glued to the body with double-sided tape, and it takes isopropyl alcohol and patience to remove it.

1. Put a few drops of alcohol under the battery (in the gap between it and the body).
2. Wait 1-2 minutes until the glue softens.
3. Carefully tuck the battery into a plastic spatula and pull it up. Don't use metal tools - they can puncture the battery!

If the battery is swelling, it can not:

• 🔥 Puncture or cut.
• 🔋 Connect to charging after removal.
• 🗑️ Dispose of waste in regular waste (requires disposal as hazardous waste).

After removing the battery, clean the contacts on the board and inside the case of glue residues. To do this, use a cotton swab soaked in isopropyl alcohol.

Step 4: Withdrawal of the motherboard

To access the motherboard, you need to unscrew 10 T3 screws holding the metal screen. Be careful: the screws are of different lengths! Remember (or take a picture) which screw was twisted from where so as not to confuse the assembly.

And when you take off the screen, you'll see the motherboard, and it's attached to:

• 🔌 Two main connectors (power and plume display).
• 🔊 Speaker and microphone (soldered to board).
• 📡 Antenna wires (stick to the body).

Disconnect all the connectors with a plastic blade, starting with the display plume (the widest, at the bottom of the board). Then gently raise the edge charge. If it doesn't respond, check if all the screws are twisted and if you forgot to disconnect the antenna wires.

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If you're removing a charger or audio chip replacement board, take a picture of the charger's position on both sides first, which will help you set it back properly and avoid confusing the sides.

Step 5: Disassembly of the display module

The Redmi Note 4 display has several layers of touchscreen, matrix and backlight, and if you need to replace broken glass, you have to disassemble the module completely.

1. Place the display on a flat surface with the screen down.
2. Heat the hair dryer around the perimeter (temperature ~70°C) for 3-5 minutes.
3. Insert a plastic blade into the gap between the glass and the frame and carefully separate the glass.

And underneath the glass is a matrix that is attached to the frame with double-sided tape, and it also needs to be heated and separated. Be careful, because the matrix is connected to the board with a thin plume that is easy to tear!

If you only replace the glass, you need to glue it around the perimeter with a special glue (for example, B-7000) without pasting the display will "play" when pressed, and the dust will penetrate into the interior.

⚠️ Note: When disassembling the Redmi Note display 4 If the lights are broken, the lights are broken, and the screen is shining after assembly, but the image is missing, it's his fault. ~800-1200 ruble.

Build a smartphone: reverse order and testing

To collect Redmi Note 4 need in reverse order, but taking into account a few nuances:

1. Before installing the battery, make sure all the plumes are connected (especially the fingerprint scanner and camera).
2. Twisting the screws cross-cross to avoid skewing the board.
3. Before gluing the back cover, make sure that the antenna wires are not clamped.

After assembly, be sure to test:

• 🔋 Charging (connect the cable and check the indication).
• 📵 Network (Make sure antennas are working).
• 👆 Fingerprint scanner and camera.
• 🔊 Speakers and microphone.

If something doesn't work, don't panic. 90 percent of the time, it's a broken plume or a bad contact. Take your phone apart again and check all the connections.

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The most common build error is forgetting to plug the fingerprint scanner plume, so the smartphone turns on, but the fingerprint sensor doesn't respond. Always double check that moment!

FAQ: Frequent questions about the Redmi Note 4 disassembly