How to carefully remove the back cover with Xiaomi Redmi Note 9S: tools, steps and risks

Why do you need to remove the cover from the Redmi Note 9S?

The back cover of the Xiaomi Redmi Note 9S is not just a decorative element, but part of the structure that protects the internal components from dust, moisture and mechanical damage. However, there are situations when it has to be removed: replacing the battery, repairing the charging plume, cleaning from dust or installing additional modules (for example, wireless charging). Unlike older smartphones with removable batteries, modern models like the Note 9S require accuracy – the cover is glued to the body, and under it hides fragile plumes.

Many users are afraid to disassemble the phone themselves for fear of damaging it or losing warranty. Indeed, careless actions can lead to cracks in the lid, a fracture of the fingerprint plume or even failure of the main board. But if you approach the process correctly — with the right tools and step-by-step instructions — the risks are minimized. In this article, we will discuss all the steps of removing the lid, from preparation to final assembly, and also tell how to avoid mistakes.

Before you start, consider that if your Redmi Note 9S is still warranty, self-repair will cancel it, in which case you should contact the Xiaomi service center. If the warranty period has expired or you are willing to take a risk, read on.

What tools will be needed to remove the cover

Without the right tools, it's almost impossible to remove the lid from the Redmi Note 9S -- you'll either damage the body or you won't be able to tamper with it evenly.

• 🔧 Plastic blade or mediator to gently lick the lid. Metal tools can leave scratches!
• 🔥 Hair dryer or thermo-air station to soften the glue. Optimal temperature: 60-80°C (not higher, otherwise damage the display!).
• 🧲 Suction cups (1-2 pcs) - help to evenly lift the cover after heating.
• 📏 Thin screwdriver (cross, 1-1.5 mm) - for unscrewing screws under the lid (if you plan to disassemble further).
• 🧴 Isopropyl alcohol (90%+) — You can't use acetone or solvents, because they're going to damage the plastic!
• 📦 The screw container is designed to keep the small parts intact, and even a plastic bottle lid with a magnetized bottom is fine.

If you don't have a thermophen, you can use a normal hair dryer, but you need to keep it at a distance of 10-15 cm and constantly move it so as not to overheat one area. The alternative is to put the phone on a warm battery (not hot!) for 5-10 minutes.

⚠️ Warning: Do not use a knife or other sharp objects to lid the lid! The risk of scratching the case or damaging the fingerprint plume (located under the lid at the top edge) is extremely high.

Preparing the phone for disassembly: Step-by-step

Before you start heating and removing the cover, you need to properly prepare the Redmi Note 9S. Neglecting this step can lead to short circuit or data corruption.

1. Turn off the phone and remove it. SIM-Even when the residual charge in the capacitors is off, it can cause a circuit to close when it comes into contact with metal tools.
2. Remove the cover and film (if any). Plastic accessories can melt when heated.
3. Discharge the battery to 20-30%, a fully charged battery is more dangerous if it is accidentally damaged.
4. Back up your data. Although disassembly does not erase information by itself, there is always a risk of error (e.g., disabling the display plume).

We also recommend working on a clean, flat surface with good lighting, putting white cloth or paper on the table to help you avoid losing small details and notice fallen off elements (for example, rubber pads).

Step-by-step: how to remove the cover from the Xiaomi Redmi Note 9S

Now, to the most critical stage, follow the instructions in strict order, without missing steps. If something goes wrong (for example, the lid does not respond), do not apply force, you better warm up the problem area again.

Step 1: Heating the lid

Turn on the dryer at medium power and evenly warm the back cover of the Redmi Note 9S for 2-3 minutes. Pay special attention to the edges where the glue is densest. Keep the dryer at a distance of 10-15 cm and constantly move it to avoid local overheating.

Check the temperature of the lid with your hand, which should be warm, but not burning. If you use a thermophen, set the temperature to 70°C.

Step 2: Filting the lid

Put a suction cup on the bottom of the phone (near the USB-C connector) and pull up slightly. If the lid doesn't lend itself, warm up the area for another 30 seconds. Once there's a small gap, insert a plastic blade into it.

Carefully swipe the lid around the edge of the lid, separating it from the body. Don't try to tear the lid off right away - the glue may be unevenly softened. Move slowly, 1-2 cm at a time.

Step 3: Complete removal of the lid

When the lid is separated around the perimeter, remove it completely. Be careful that thin plumes (such as antenna contacts or fingerprint scanner plumes) may stick to it. If you feel resistance, check if you have forgotten to disconnect a piece.

Put the lid on the clean surface with the inside up, and you'll see the battery, the plumes, and other components, and if you're looking to replace the battery or clean it, you can start the next step, and if you've removed the lid for diagnostics, check it for cracks or deformities.

⚠️ Warning: If after removing the lid you see that the fingerprint plume is torn off or bent, do not turn on the phone! this may lead to a short circuit. Carefully return the plume to place or contact the service.

Common Mistakes and How to Avoid Them

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

• 🔥 Overheating the lid - causes plastic to deform or detach paint. Solution: Use a thermometer or check the temperature with your hand.
• 🔪 Using metal tools -- scratches the body and can puncture the battery. Solution: Plastic blades or mediators only!
• 💧 Getting alcohol on the display corrodes the oleophobic coating. Solution: Apply alcohol only to the edge of the lid using a cotton swab.
• 🔋 Battery damage - a bloated battery can burst if it is not removed gently.Solution: If the battery is blown up, don't disassemble the phone yourself!
• 📱 Display plume breaks -- occurs when the lid is removed abruptly. Solution: Separate the lid slowly, starting at the bottom edge.

Another common problem is that the lid is not evenly glued when it is reassembled, so if you replace the adhesive layer (like double-sided tape), make sure it's evenly distributed around the perimeter, otherwise the lid will walk or fall off over time.

1) Is the battery connected (sometimes the plume leaves when the cover is installed).

(2) Is the power plume (thin black wire at the charging socket) damaged?

3) Are the contacts closed (check for foreign metal particles).-->

How to glue the lid back: assembly tips

Remove the lid is half the battle, and it's also important to put it back in the right way, so that the phone retains its dust-resistant lid (the Redmi Note 9S' IP53) and doesn't creak when you press it.

1. Clean the surfaces of the old glue with isopropyl alcohol and a lilac-free wipe. Don't use paper towels -- they leave fibers.
2. Apply a new glue. The best option is a special glue B-7000 or double-sided 3M 9448A tape (0.2 mm thick), apply it in a thin layer around the perimeter, receding 1-2 mm from the edges.
3. Line the lid before the final press. Start at the bottom edge (at USB-C) and gradually press it against the body as you move upwards.
4. Secure the lid with plugs or heavy books for 10-15 minutes. Don't turn the phone on immediately - let the glue dry (at least 1 hour).

If you notice that after assembly, the volume buttons or power buttons become less responsive, then the lid presses on them, in which case you will have to repeat the procedure, putting a thinner layer of glue in the problem area.

To check the tightness, you can use a test for dust protection:

1. Blow around the buttons and connectors - there should be no whistle (meaning there are no gaps).
2. Put the phone in a silica gel bag for 10 minutes (it will absorb moisture if it has penetrated inside).

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If the phone overheats or runs out quickly after assembly, it's likely that the battery or power plume is damaged.

When is it better to contact the service, rather than disassemble yourself

While removing the lid from the Redmi Note 9S is a feasible task, there are situations where the risks outweigh the benefits.

• 🔋 Battery swollen or deformed (risk of fire if damaged!).
• 💧 The phone has been in water or other liquid (a complete corrosion diagnosis is needed).
• 📱 The display is cracked or the sensor is not working (when disassembling, you can aggravate the problem).
• 🔌 The phone is not powered on or charged (the reason may be in the motherboard).
• 🛠️ You have no experience in disassembling electronics (beginner mistakes are expensive).

The cost of replacing the lid in the service is usually 1,500-3,000 rubles (depending on the region and the reason for disassembly). If you need to replace the battery or plume, the price will rise to 3,000-5,000 rubles.

Xiaomi’s official service centers use original parts and give a guarantee for work, but if you are using an informal service, check what parts will be used (original or analogue) and whether there is a warranty.

FAQ: Frequent questions about the dismantling of Xiaomi Redmi Note 9S