Replacement of the back cover on Xiaomi Redmi Note 9 Pro: detailed instructions with photos and tips

Replacing the back cover with the Xiaomi Redmi Note 9 Pro is a challenge that owners face after falling, scratching or wanting to upgrade the design of a smartphone. Despite its apparent simplicity, the procedure requires care: one wrong move can damage plumes, buttons or even the battery. In this article, we will discuss all the steps from tool preparation to final assembly, and also explain how to avoid common errors.

Many users are afraid to disassemble the smartphone themselves, fearing to lose the warranty or break the device, but if the warranty period has already expired, and the service center calls the price in the case of a new device. 3-5 You know, thousands of rubles for a simple lid replacement, it's more logical to try to do it yourself.

What tools will be needed to replace the cover

Before you start disassembling the Redmi Note 9 Pro, prepare a full set of tools. Without them, you risk damaging the body or internal components.

• 🔧 Plastic blades (2-3 (a) - for the careful liding and disconnection of the plumes.
• ⚙️ Cross screwdriver (size) PH00 or PH0) — rear-panel.
• 🔥 Hair dryer or thermo-air station - for softening the glue (temperature) 60-80°C).
• 🧲 Magnetic mat or container – to avoid losing small screws.
• 📱 Screen suction cup (optional) – helps to lift the lid after heating.
• 🧴 Isopropyl alcohol (90%+) — glue-residue.
• 🎨 Double-sided tape or glue B-7000 — lock-in.

If you don't have a thermo-air station, you'll need a hair dryer, which is hot air and temperature control, and don't use metal tools to lick the lid, because they'll scratch the body and they can close the contacts on the board.

We also recommend buying a spare cover in advance. Original parts from Xiaomi are expensive (from 2000 rubles), but guarantee the perfect fit. Alternatively, quality replicas from trusted sellers (for example, on AliExpress or in specialized stores).

Preparing the smartphone for disassembly: security steps

Before removing the back cover, you need to properly prepare the device, which minimizes the risk of damage to the internal components and simplifies the assembly process.

1. Turn off your smartphone and remove it. SIM-cards and memory cards (if installed).
2. Charge the battery before 30-50%. Fully discharged or charged on 100% The battery can cause a short circuit in case of accidental damage.
3. Remove the case and clean the case of dust and dirt, and debris particles can get inside the device.
4. Prepare the workplace: a flat surface, good lighting, no carpets or fluffy coatings (they accumulate static electricity).

It is important to note that your Redmi Note 9 Pro was in water or was subjected to severe humidity, disassembly is better to postpone on the water. 2-3 Humidity inside the enclosure can lead to corrosion of contacts when heated by a hair dryer.

⚠️ Attention! Do not use metal objects to disconnect the battery. Even a small circuit of the contacts can incapacitate the power controller.

If you’ve never taken a smartphone apart, practice on an old device or watch Redmi Note 9 Pro video demos on YouTube to help you understand how hard you can push your shoulder blade and how to lift the lid properly.

Step-by-step: how to remove the back cover

Now, the most important step is to remove the old lid, and follow the instructions carefully so that you do not damage the plumes or buttons.

Step 1: Heating the glue layer

The back cover of the Redmi Note 9 Pro is glued around the perimeter, and to separate it, you need to soften the glue.

1. Turn on the dryer at medium power (temperature) 60-80°C).
2. Heat the lid in a circle, paying special attention to the corners and edges (on the edges). 15-20 seconds on each site).
3. After heating, try to gently tuck the lid with a plastic blade in the area of the charging connector (there is less glue).

Step 2: Separation of the cover

When the glue softens, insert the blade into the gap and slowly lead it along the edge of the lid. Do not put excessive effort — if the lid does not respond, reheat the problem area.

Be especially careful in the areas:

• 📷 Around the camera module (there are plumes).
• 🔊 Next to the speaker and microphone.
• 🔋 In the battery area (do not damage it!).

Step 3: Disconnecting the plumes

After removing the cover, you will see several plumes:

• 📶 Antenna contacts (glued to the cover).
• 🔘 The plume of the power button and volume control.
• 📷 Camera plumes (if the lid is removed from the module).

Carefully disconnect them with a plastic spatula. Don't pull the wires! - better put the connector on the side.

⚠️ If the lid is already glued to the antenna tape, don't force it off. You'd better heat it up with a hair dryer and slowly separate it.

Video instructions for disassembly (example):

YouTube → "Redmi Note 9 Pro back cover replacement"

Installation of a new cover: nuances and tips

When the old lid is removed, you can start installing a new one, and it's important not only to fix it properly, but also to ensure that all functions of the smartphone are sealed and kept safe.

Step 1: Cleaning the hull

Before installing the new cover:

1. Remove the remnants of old glue from the smartphone frame (use isopropyl alcohol and cotton swab).
2. Check the integrity of sealing rubber bands (if any) - they protect against dust and moisture.
3. Make sure all the plumes and contacts are in place.

Step 2: Applying glue

For fixing the cover can be used:

• 🧴 Double-sided scotch (e.g., double-sided scotch, 3M) — Simple option, but less reliable.
• 🎨 Clay. B-7000 — It provides a strong attachment, but requires accuracy.
• 🔥 Thermoclee (for professionals) – applied with a gun.

Apply a thin layer of glue around the frame, avoiding hitting the speaker, microphone or connectors. For antenna contacts, use special tape (usually complete with a new cover).

Step 3: Installation and fixation

Carefully apply the new lid to the body and press it evenly.

1. So, turn all the stains (not to be worn).
2. Connect the plumes in reverse order.
3. Check the buttons, cameras and wireless modules (Wi-Fi, NFC).

Tip: After assembly, turn on your smartphone and test all the features. If something doesn't work (for example, it doesn't catch the network), the antenna contacts are likely not glued well.

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If the Wi-Fi or mobile signal deteriorates after the cover is replaced, check if the antenna contacts fit tightly, sometimes additional foil tape sticking helps.

Common Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when replacing the back cover, and here are the most common ones and ways to prevent them:

Another common problem is that the holes on the new lid don't match, which happens if you buy a cheap replica.

• 📏 Dimensions and shape of cutouts under the camera and sensors.
• 🔍 Availability of a magnet for wireless charging (if supported).
• 🎨 Color and texture – some lines differ in shade.

If the lid is overheated after the replacement, check if it closes the vents (for example, near the speaker), and make sure that the heat paste on the processor was not accidentally erased.

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The most common cause of broken buttons after a cover is replaced is a misconnected plume, and always check the fixation before the final assembly.

How much does it cost to replace the cover in the service vs. independently

If you're in doubt, you can go to a service center, but the prices are often too high.

As you can see from the table, self-replacement costs 2-3 times less, but if you don't have experience, the risk of damaging your smartphone increases, in which case you'd better pay extra for a professional.

Where can I buy parts?

• 🛒 AliExpress is a great choice, but a long wait (2-4 weekdays).
• 🏬 Local parts stores (e.g., "Fix-Price Repair" or "Chip and Deep").
• 🌍 eBay or Amazon – original details, but more expensive.

When buying, check if you have glue and antenna stickers, without which the installation can be problematic.

What to do if something doesn’t work after replacement

Sometimes, after the lid is replaced, owners of the Redmi Note 9 Pro will experience problems.

1. Volume or power buttons are not working

Reason: The button plume is not connected or damaged.

Decision:

• Take apart the smartphone and check the connection of the plume.
• If the sleeve is broken, it will need to be replaced (cost). ~500 ₽).

2. Poorly catches the net or Wi-Fi

Reason: antenna contacts are poorly glued or damaged.

Decision:

• Check if the antenna stickers fit tightly.
• If necessary, re-paint them with foil tape.

3.The smartphone is overheating

The reason: the thermal paste on the processor is erased or the cover fits tightly to the radiator.

Decision:

• Remove the cover and check the condition of the thermal paste.
• If necessary, apply a new one (for example, Arctic). MX-4).

4.The camera does not focus or gives an error

The reason: the camera plume has gone or become contaminated.

Decision:

• Gently wipe the contacts of the plume with alcohol.
• Reconnect the plume and check the fixation.

If neither of these methods worked, maybe the problem isn't the lid, it's the board itself, and in that case, you should go to the service.

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Before the final assembly, take a picture of the location of all the plumes and screws, which will help to avoid errors when re-installing.

FAQ: Frequent questions about replacing the cover with the Redmi Note 9 Pro