Disassembly Xiaomi Redmi Note 7 with your own hands: instructions with photos and warnings

Xiaomi Redmi Note 7 is one of the most popular smartphones of 2019, but even it is not immune to breakdowns. The screen does not respond to touches? The battery swells? The speaker stopped working? The service center will charge from 1500 rubles for dismantling, but with the tools and patience you can do it yourself. In this article, a step-by-step analysis of the process taking into account all the nuances of the model, including hidden latches, the risks of damage to the plumes and the features of battery attachment.

Before you start screwdriver, consider that the Redmi Note 7 is not designed for custom repairs, its body is glued together, and many elements (for example, a fingerprint scanner or a camera) are connected by fragile plumes. A mistake at any stage can lead to permanent damage to the motherboard due to static electricity or contact breaks. If you are not sure about your skills, you better contact the professionals.

In this instruction, we will consider:

• 🔧 What tools are needed (and what can not be replaced by professional devices)
• 📱 How to safely remove the back cover without damaging antenna lines
• 🔋 Features of battery recovery (blown vs. normal)
• 🛠️ Sequence of disconnection of plumes and disassembly of the motherboard
• ⚠️ Common Mistakes and How to Avoid Them (In Real Cases)

1.Preparation: tools and conditions

To disassemble the Redmi Note 7, you will need a specialized set that cannot be replaced by improvised means.

• 🔨 Plastic blades (preferably a set of 3-5 pieces of different thickness) - to separate the body
• 🔧 Cross screwdriver PH00 (magnetic) - for the screws of the motherboard
• 🔥 Dryer or thermo-air station (power of at least 1000 W) - for softening the glue
• 🧲 Suction (diameter 5-7 cm) - to lift the back cover
• 📏 Plastic card or mediator – for gently detaching the cover
• 🔌 Antistatic bracelet (or alternatively touching your heating battery before work)
• 🧴 Isopropyl alcohol 90%+ — cleaner

⚠️ Warning: Do not use metal blades or knives! They will damage antenna lines on the inside of the cover, which will lead to loss of Wi-Fi signal and mobile network. Also avoid cheap Chinese screwdrivers - they often "lick" the slime screws.

Better work on a clean desk with good lighting, cover the surface with white paper or cloth without pile, this will help you not lose small parts (screws, gaskets). If you disassemble the phone from a bloated battery, perform the procedure away from flammable objects and in a ventilated room.

Removal of the back cover: technique and risks

The Redmi Note 7's back cover is glued around the perimeter and is held on plastic latches, and the main challenge is not to damage the antenna contacts (thin metal tracks under the lid), if they break, the phone will lose communication with the networks.

Procedure:

1. Turn off the phone and remove it. SIM-scatter-card.
2. Heat the cover with a hair dryer around the perimeter (temperature) ~60–70°C, 10 to 15 cm away) for 2-3 minutes.
3. Then, lift the lid from the bottom (where the suction connector is located). USB-C). If the suction cup does not hold, reheat this area.
4. Put a plastic blade in the gap, and carefully guide it along the body, snapping the mounts. Do not force! If the lid does not respond, heat the problem area again.

⚠️ Warning: There are two fragile antenna lines on the top of the lid (near the camera), and if the blade catches them, the signal will be sent. 4G And the Wi-Fi will be gone forever!

After removing the cover, you will see:

• 🔋 Battery (stick to the body)
• 📷 Metal framed main camera module
• 📶 Antenna contacts (black and silver tracks)
• 🔊 Dynamics and vibrator

3. Battery Removal: Bloated vs. Normal

The 4000mAh Redmi Note 7 battery is glued to the body with double-sided tape, and if it swells, it cannot be pierced or bent, which can cause a fire or explosion!

Instructions for a normal battery:

1. Disconnect the battery plume (it's under a black protective film) Use a plastic blade to plug the connector.
2. Pull the battery from any angle and pull the black thrust tape (if you have one), if you don't, gently pull the battery around the perimeter, pouring isopropyl alcohol to dissolve the glue.
3. Don't pull the wires! They're soldered to the board and they can come off.

If the battery is swelling:

• 🚨 Do not use metal tools – only plastic or wood.
• 🔥 Wear protective glasses and gloves.
• 📦 Place the phone in a tight package while you extract it to localize possible electrolyte splashes.
• 🔋 Carefully swell the battery, starting with the least bloated part.

⚠️ Warning: If the battery is severely deformed (more than 10 mm high), it is better to leave it to professionals, in such cases the risk of fire if the shell is damaged reaches 30%.

4. Disconnection of plumes and removal of motherboard

Once the battery is removed, you can start disassembling the fillings, so the key is not to confuse the order of turning off the plumes and damage them. Redmi Note 7 has only 6 of them:

• 📞 Display plume (the widest, at the top of the board)
• 📷 Main camera plume (thin, under metal frame)
• 📸 The plume of the front camera and sensors (near the display connector)
• 🔊 Dynamic plume (small, at the bottom of the)
• 📡 The antenna plume (glued to the cover, detached lastly)
• 🔋 Charging plume/USB-C (battery-operated)

Procedure:

1. Take a picture of the location of the plumes - this will help with the reverse assembly.
2. Turn away 11 screws that attach the motherboard (use a magnetic screwdriver to avoid losing them).
3. Start turning off the plumes with a plastic blade, putting them on the black locks.
4. Then, make sure you are on the right side of the charge. USB-C) And get it out.

⚠️ Attention: The fingerprint scanner plume (if you have one in your modification) is extremely fragile, and a break in it will lead to a broken sensor that cannot be restored, just replace the entire module.

💡

Before you turn off the plumes, mark them with a marker (e.g., "D" for display, "C" for camera) which will speed up the reverse assembly and reduce the risk of error.

5. Disassembly of additional modules

If you need to reach the speaker, vibromotor or camera, after removing the motherboard, do the following:

• 📷 Camera: Turn 2 screws on the metal frame and gently lift the module.The camera plume is short - don't pull it too much!
• 🔊 Speaker: Sticked to the case, put a plastic blade on it, and unplug the plume from the board.
• 📳 Vibromotor: Located at the top of the body, glued but easily removed after heat by a hair dryer.
• 📡 Antenna modules: Sticked to the lid. Replacing them requires a soldering iron and experience.

Pay special attention to flexible flat cables (FPC). They're attached to the board with a latch that you have to lift with a blade before you take it out, and if the latch breaks, the plume will hang around, and the contact will disappear.

Typical problems in disassembling modules:

• 🔧 Torn screws - use a screwdriver with the correct size of the slit.
• 🔥 Overheating boards - don't keep the hair dryer too close to the chips.
• 💧 Getting alcohol on the screen - this can damage the oleophobic coating.

💡

The most common mistake in disassembling the Redmi Note 7 is the shattering of the fingerprint scanner plume, which is thinner than the others and has no margin in length, and if the sensor stops working after assembly, the plume is likely damaged.

6. Backup Assembly: How to Avoid Errors

It is often harder to assemble a phone than to disassemble it, and here are the key points to avoid problems:

1. Check all the plumes for damage before connecting, and if there is dirt on the contacts, clean them with alcohol.
2. Hold the latches of the plumes to the click, and not tight enough will lead to artifacts on the screen or a broken camera.
3. Put new glue on the back cover. The old glue loses its properties when heated. Double-sided tape will do. 3M or special glue B-7000.
4. Check the leakproofness before final assembly. Make sure all gaskets (e.g., around the camera) are in place.

⚠️ Warning: If the phone doesn't turn on after assembly, check: Is the battery plume connected (a common mistake is forgetting to connect it back), is the contacts on the board closed (check under a microscope or a magnifier). Is the back cover skewed (this can press on the board and cause a short circuit).

After assembly, turn on the phone and check:

• 📶 Mobile network and Wi-Fi (if there is no signal, antenna lines are damaged).
• 📷 Camera (if the image with artifacts – the plume is connected loosely).
• 🔋 Charging (if there is no current - check the connector) USB-C).
• 🔊 Sound (if the speaker is not working – the plume has moved or damaged).

7 Frequent breakdowns after self-disassembly

Even with a careful disassembly of the Redmi Note 7, there can be problems, and here are the most common ways to fix them:

If after disassembly there are artifacts on the screen (strips, flickering), most likely damaged the display plume or flexible cable, in this case, you will need to replace the module, since soldering plumes at home is almost impossible.

When to contact the service:

• 🔧 If after assembly the phone overheats (possibly a short circuit on the board).
• 📵 If the mobile network is lost (antenna contacts are damaged).
• 🔋 If the battery is re-swelled (the charging controller is faulty).

FAQ: Answers to Frequent Questions