Disassembly Xiaomi Redmi Note 9 Pro: a detailed guide with photos and nuances

Xiaomi Redmi Note 9 Pro is one of the most popular mid-range smartphones, but even it is not immune to breakdowns. Screen with cracks, bloated battery, problems with the speaker or microphone – all these malfunctions often require disassembling the device. In this article, you will find step-by-step instructions for disassembling the features of the design of the model, as well as tips on how to avoid typical errors when self-repairing.

It's important to understand that disassembling the Redmi Note 9 Pro (codenamed joyeuse) has its own nuances, for example, the adhesive tape under the battery can make it difficult to remove it, and the fragile plume of the fingerprint scanner requires special care. If you've never disassembled a smartphone before, we recommend you first read the video reviews of the process or contact the service center. But if you are confident in your abilities, let's go!

Preparation for disassembly: tools and security measures

Before you start, make sure you have everything you need, and without the right tools, you risk damaging the case, the plumes, or even the motherboard, and here's the minimum kit you'll need:

• 🔧 Plastic mediators (2-3 pc.) - for careful liding and disconnection of adhesive joints.
• 🔨 The screwdriver (PH00 or PH0) — for the screws of the case and motherboard.
• 🔥 Hair dryer or thermal air station - to soften the glue under the back cover.
• 🧲 Magnetic mat or container – to avoid losing small screws.
• 🔋 Suction (optional) – helps to raise the screen if you disassemble the smartphone because of the display.
• 🧴 Isopropyl alcohol (90%+) — Cleaning contacts and removing glue residues.

Also, prepare the workspace: it should be well lit, without dust and static electricity. It is best to use an antistatic table or at least cover it with a clean cloth. Remember that the Redmi Note 9 Pro has a non-removable battery - it is necessary to turn off the board before any manipulation with internal components!

⚠️ Warning: If the smartphone battery is swollen, do not heat it with a hair dryer and do not puncture! This can lead to fire.

Removing the back cover: how not to break the latches

The back cover of the Redmi Note 9 Pro is attached to glue and plastic latches, and to remove it, you first need to soften the glue.

1. Turn off your smartphone and remove it. SIM-map.
2. Heat the hair dryer back cover around the perimeter (temperature ~60 ° C, distance 5-7 cm) for 2-3 minutes.
3. Insert a plastic mediator into the gap between the lid and the case (start at the bottom edge where the USB-C connector is).
4. Carefully drive the mediator along the body, snapping the mounts.

If the lid doesn't respond, repeat the heat, don't use metal tools to avoid scratching the body, and also note the antenna contacts at the top of the lid, which are easily damaged if you move around carelessly.

Once you remove the lid, you'll see the battery, the motherboard and some plumes. Don't pull the plumes, they're fragile. First you turn off the battery, and then you start disassembling them.

Disconnecting the battery and removing the motherboard

The battery in the Redmi Note 9 Pro is glued to the case, but before it is removed, you need to disconnect the connector from the motherboard.

1. Find the battery connector (usually located at the bottom of the board, next to the USB-C port).
2. Carefully put the connector on a plastic pickup or tweezers. Don't use metal, you can close the contacts!
3. After disconnecting, check with the multimeter that there is no voltage on the board (optional, but recommended).

Now you can start removing the battery, and underneath it is a tape that you need to tweak and pull carefully, and if the battery doesn't respond, heat it up a little with a hairdryer (not above 50°C!), and in no case rot the battery or puncture it, it can cause a fire or explosion.

Once the battery is removed, you can start removing the motherboard.

1. Unscrew all the screws (there are about 10-12 pieces, of different sizes – remember the location of each!).
2. Disconnect all the plumes: display, cameras, fingerprint scanner, speaker.
3. Carefully raise the fee on one side and extract it.

⚠️ Note: The Redmi Note 9 Pro board has a chip installed NFC (If your model supports it, it's next to the battery, and it's attached to the board with a small connector, and if you move it carelessly, it's easy to pull it off!

Disassembly of the display module and fingerprint scanner

If you need to replace a screen or a fingerprint scanner, you have to disassemble the front of your smartphone, which is more complicated than removing the back cover, because the display is glued around the perimeter.

Algorithm of action:

1. Heat the screen edge with a hair dryer (temperature ~50°C) for 1-2 minutes.
2. With a suction cup or plastic mediator, gently lift the display on one side.
3. Insert the mediators into the slot and gradually separate the screen from the case, softening the glue with a hair dryer.
4. After separation of the screen, turn off the display and sensor plumes.

The fingerprint scanner in the Redmi Note 9 Pro is built into the power button.

• Remove the back cover (as described above).
• Disconnect the scanner plume from the motherboard.
• Carefully remove the button along with the scanner, pulling it from the side.

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If the screen is cracked, but the sensor is working, before disassembling, paste it with tape so that the fragments do not fly apart and damage the plumes.

Common Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when disassembling the Redmi Note 9 Pro. Here are the most common of them and ways to prevent them:

• 🔧 Breaking screws - use a screwdriver with the correct sting size (PH00) And don't put too much effort into it. If the screw doesn't work, try dripping a little. WD-40.
• 🔥 Battery overheating – don’t heat it above 50°C and don't hold the hair dryer too close. It's better to warm it in short intervals.
• 📱 Damage to plumes - always turn off the battery before manipulating the board and do not pull the plumes, but carefully poke them from the edges.
• 🧲 Losing screws – use a magnetic mat or container with cells. screws in the Redmi Note 9 Pro of different sizes, and it is easy to confuse them!

Another common problem is that the antenna contacts on the back cover are damaged, and they're on the top of the back, and they're very thin, and if the contacts come off, the network and Wi-Fi signal will get worse, and to avoid that, when you remove the lid, don't just peel it at the top, but start at the bottom or the side.

Build a smartphone: reverse order and testing

The Redmi Note 9 Pro should be assembled in reverse order, but with some nuances:

1. Make sure that all contacts on the board and plumes are clean (wipe them with isopropyl alcohol if necessary).
2. When installing the battery, use a new duct tape (it can be bought in repair kits).
3. Twisting the screws cross-cross to avoid skewing the board.
4. Before final assembly, plug in the battery and check if the smartphone is turned on.

After assembly, be sure to test all the functions:

• 📶 Communication quality and Wi-Fi (check antenna contacts).
• 🔋 Charging and operation of the battery (must not be overheated).
• 🎵 Sound in speakers and microphone.
• 📸 Operating of cameras (front and main).
• 👆 Touch screen and fingerprint scanner.

⚠️ Warning: If the smartphone overheats or discharges quickly after assembly, it is possible that the battery is installed incorrectly or the thermal paste on the processor is damaged.

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The main rule of assembly: take your time! Check every step, especially the connection of plumes and screws. One mistake can lead to expensive repairs.

When to contact the service center

Not all breakdowns can be repaired on your own, but here are some of the best ways to entrust repairs to professionals:

• 💥 Bloated battery – replacing it requires special skills and equipment.
• 🔧 Damage to the motherboard (burnt elements, cracks) - for diagnosis, a soldering station and experience are needed.
• 📡 Problems with antennas or communication module – exact soldering or chip replacement is required.
• 💧 Liquid intake – even if the smartphone is turned on after drying, corrosion can occur later.

Also contact the service if after self-disassembly there are new problems: for example, the smartphone does not see SIM-This could indicate damage to plumes or contacts.

The cost of repair in the service center depends on the breakdown:

• Screen replacement: ~3,000–5,000 rubles.
• Battery replacement: ~1 500-2 500 rubles.
• Mainboard repair: from 2 000 rubles (depending on the complexity).

FAQ: Frequent questions about the Redmi Note 9 Pro