Disassembly Xiaomi Redmi Note 7: a full guide with photos, schemes and life hacks

The Xiaomi Redmi Note 7, launched in 2019, is still one of the most popular self-repair smartphones, and its modular design and availability of parts make it an ideal candidate for replacing a display, battery, or even motherboard at home, but disassembling it has several pitfalls, from the fragile plume of a fingerprint scanner to the battery’s glue mount, which can turn a simple replacement into a nightmare if acted at random.

In this guide, we will take a closer look at the Redmi Note 7 disassembly process (codenamed lavender), highlight the critical points that are often overlooked in standard instructions, and provide practical tips to avoid typical errors. You will learn what tools are really needed (and what you can do without), how to properly disconnect the plumes so that they do not break, and what to do if the smartphone does not turn on after assembly.

Preparation for disassembly: tools and precautions

Before you start disassembling, make sure you have everything you need, and even one tool that you don't have can damage the body or the internal components, and here's the minimum kit you'll need:

• 🔧 Plastic mediators (2-3) for the tidying of the lid and separation of adhesives. Metal tools are not allowed here!
• 🔨 The PH00 screwdriver is for the back cover screws. Note that the screws in the Redmi Note 7 are of different lengths, so you need to fold them separately.
• 🔋 Suction cup (2-3) - to raise the display after warming up. It is better to use suction cups with a diameter of 3-4 see.
• 🔥 Dryer or heat plate to soften the adhesive. Optimal temperature: 60–80°C. Overheating above 100°C can damage the display!
• 🧴 Isopropyl alcohol (90%+) — acetone or solvents should not be used!
• 📦 The screw containers, so you don't mess up the fasteners when you build them, you can use a small plastic container or a magnetic mat.

Important: if you are planning to replace the battery, additionally prepare a plastic card (for example, a bank card) to separate the adhesive layer and a double-sided tape or B7000 glue to fix the new battery. We also recommend having a multimeter at hand to check the voltage on the battery before installation (normal: 3.7-4.2V).

⚠️ Warning: If you're disassembling a smartphone with a damaged display, be sure to put a tape or protective film on it before warming up. Glass shards can fly apart when heated and injure!

Removing the back cover: how not to break the latches

The Redmi Note 7 back cover is mounted on 12 screws and plastic latches, and the challenge is not to damage those latches when you remove them, or the lid will hang or fall into place.

1. Turn off your smartphone and remove the tray for the SIM- cards. This will prevent accidental closure of contacts.
2. Unscrew all the screws around the perimeter of the lid. In the Redmi Note 7, they are arranged as follows: 2 screws at the Type-C connector 4 screws on the sides (2 on each side) 6 screws at the top (including the camera area)

Warm up the edges of the lid.

Put the lid on a plastic mediator.

If the lid doesn't lend itself, don't force it -- you've probably missed the screw or not warmed up enough -- Redmi Note 7 has the most fragile area, the area around the power button, and it's where the latches break most often!

Battery shutdown: why it's critical

Before you manipulate the internal components, you have to turn off the battery. In the Redmi Note 7, this is done by detaching the plume from the motherboard. Why is this so important?

• 🔌 Short circuit risk – even a smartphone turned off can supply voltage to a board when touching metal tools.
• 💥 Power controller damage – if the battery contacts are accidentally closed, the chip PM660 may burn, resulting in the device being completely inoperable.
• 📱 Sensor false alarms – When the battery is connected, the display or buttons can respond to touch, which interferes with repair.

To turn off the battery:

1. Carefully tuck the black battery connector with a plastic blade, which is located at the bottom of the board, next to the vibrating motor.
2. Unplug the connector by pulling it upwards (not to the side!) Don't pull the wires - you can tear the contacts off!
3. Fix the connector with tape to the case so that it does not touch the board during repairs.

⚠️ Warning: If, after the battery is turned off, the smartphone spontaneously turns on when the display plume is connected, this is a sign of a malfunction of the power button or controller PM660.

Battery disconnected |Point location photographed |Tools isolated (no static electricity)|Workplace lit and free of debris

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Replacement of the display: step-by-step instructions with a photo

The Redmi Note 7 display (Article: MB-LV005-1) is attached to the glue and held by 4 latches.

1. Warm up the display with a hair dryer around the perimeter for 3-5 minutes. Start at the bottom, where the plume is located.
2. Push the screen with suction cups (2 on the sides) and gently lift it. If the display does not move, warm up for another 1-2 minutes.
3. Disconnect the plumes: Display plume (wide, 30 contacts) Fingerprint scanner plume (thin, 8 contacts) - the most fragile!

Use a plastic spatula to plug the connectors.

Remove old glue

Put on a new glue

B7000

Install a new display

After you change the display, check the sensor and the fingerprint scanner, and if the scanner doesn't respond, it's likely that the plume or the connector on the board has been damaged, and you'll need to be diagnosed with a multimeter.

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If you have "waves" or squashes after you change the display, it's a sign of bad gluing. Take the smartphone apart and apply the glue uniformly, avoiding bubbles.

Battery replacement: how to avoid bloating and short circuit

The Redmi Note 7 battery (BM47, 4000 mAh) is attached to a high-strength double-sided tape tape, and it requires caution to replace it:

• 🔋 Don't puncture the battery, it could cause a fire or explosion. If the battery is swelling, use insulated tools.
• 🧲 Don't use metal objects to separate the glue. A plastic card or a mediator is the best choice.
• 🔌 Check the voltage on the new battery before installation. It should be within 3.7-3.8V (not 4.2V!).

Step-by-step:

1. Disconnect the old battery from the board (as described above).
2. Put the tape under the battery with a plastic card. In Redmi Note 7, the glue is striped, pulling them one by one.
3. Remove the glue from the case with alcohol. Don't use acetone, it corrodes plastic!
4. Apply a new double-sided tape to the case (or use B7000 glue).
5. Install a new battery starting at the bottom, make sure it's flat, free of distortion.
6. Connect the plume to the board and fix it with tape to avoid accidental disconnection.

⚠️ Warning: If a new battery is rapidly discharged or heated after installation, check the resting current using the AccuBattery app. Normal: 5-10 mA in standby mode. Exceeding this value indicates a malfunction of the board or charging controller.

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Never use a battery if it is swelling or has visible damage to the shell. Even if it is "still working", the risk of short circuit is extremely high!

Smartphone Assembly: How not to forget important details

Building the Redmi Note 7 after repair requires as much care as disassembling.

• 🔩 Rotors -- screw them in the same order that you screwed them out. Rotors of different lengths: short (2.5 mm) goes to the top, long (3.5 mm) goes to the bottom.
• 📶 Antenna contacts -- make sure that the metal springs on the back cover are in contact with the board, otherwise the network signal will deteriorate.
• 🔊 Speaker and microphone -- make sure that their holes are not covered with glue or dust. Use a toothpick to clean.
• 📱 The plumes -- all the connectors must be tightly connected. Pay particular attention to the fingerprint scanner plume, which is often dropped off when you build it.

After assembly, perform the test:

1. Turn on your smartphone and check the work of the display, sensor, fingerprint scanner.
2. Call another phone to check the microphone and speaker.
3. Connect the charging and make sure that the charging is underway (the indicator should burn).
4. Insert the SIM- card and check the network signal (should be at least 2-3 divisions).

If the smartphone doesn't turn on after assembly, don't panic.

• The battery or display is not connected.
• Closed contacts on the board (check multimeter).
• The power button plume is damaged (article: MB-LV007).

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If you've got any extraneous vibrational noise after assembly, you're probably going to have a vibratory motor (MB-LV008) that's crooked. Take the smartphone apart and correct it.

Common Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when disassembling the Redmi Note 7, and here are the most common ones and ways to prevent them:

Another common problem is that the fingerprint scanner plume is damaged, and it's underneath the display, and it's attached to the board with a thin connector, and if you're not handling it, the plume breaks, and the scanner stops working, so you don't have to do that.

• Always disconnect the display plume in front of the scanner plume.
• Don't pull the wires, just the connector!
• If the plume is still broken, it can be replaced (Article: MB-LV005-4), but this requires soldering.

FAQ: Answers to Frequent Questions