How to carefully remove the back cover on Xiaomi Redmi 9: instructions with photos and warnings

The back cover of the Xiaomi Redmi 9 is not just a decorative element, but a complex design that protects the internal components of the smartphone from dust, moisture and mechanical damage. However, over time, it may need to be removed: to replace the battery, clean the dust, repair plumes or even replace broken glass. Unlike the flagship models with metal cases, the Redmi 9 uses a plastic cover with adhesive attachment, which complicates the process of disassembly, but makes it possible at home.

This article will help you figure out how to properly dismantle the back panel without damaging your smartphone. We will look at official and alternative methods, list the necessary tools, and warn you of typical errors that lead to permanent damage to the adhesive layer or flexible plumes. If you have never taken your phones apart before, don’t worry: with a competent approach, even a beginner can cope with the task in 20-30 minutes.

Preparation for disassembly: tools and conditions

Before you start removing the lid, make sure you have everything you need, and using the wrong tools is the main cause of damage to the body or internal components, and here is the minimum set you'll need:

• 🔧 Plastic mediators or shoulder blades (2-3 pieces) - for careful lid lashing!
• 🔥 Hair dryer or thermo-air station - for softening the glue (optimum temperature: 60-80)°C).
• 🧴 Isopropyl alcohol (90%+) — cleansing.
• 📱 Suction cups (optional) – help lift the lid after heating, but are not mandatory.
• 🔋 New glue layer or double-sided scotch – if you plan to collect your phone back.

Also prepare the workplace:

• 🪑 Work at a table with good lighting (better to use a desk lamp).
• 🧹 Remove any small items that may get inside the phone (clips, pins, etc.).
• 📸 Take a picture of the disassembly process at each stage – this will help to properly assemble the phone back.

⚠️ Warning: Do not use knives, screwdrivers or other sharp metal objects to pull the lid! Even a small pressure can damage the plumes or leave scratches on the plastic, which will then be noticeable when assembled.

Removal of the back cover: which one to choose?

There are three main ways to dismantle the Redmi 9 cover, each with its own pros and cons, depending on your experience, tools and purpose.

For Redmi 9, we recommend the thermal method as the safest, which involves heating the adhesive layer evenly around the perimeter of the lid, which reduces the risk of cracking the lid, and the mechanical method can only be used as a last resort if you do not have a hair dryer, but be prepared for possible damage.

If you’re disassembling a battery replacement phone, consider that the 2020-2021 Redmi 9 models often have particularly strong battery adhesives, which may require additional heating or a special adhesive solvent.

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Before heating, remove the cover and protective glass (if any) - they can melt or prevent uniform warming.

Step-by-step: remove the cover by the thermal method

This section provides a detailed guide to removing the back panel using a hair dryer. Follow the instructions strictly in order to avoid errors.

Turn off the phone and remove it. SIM-memory-card|Check the availability of all tools|Heat the hair dryer to 60-70°C (not higher!)|Put the phone on a soft surface (towel or napkin)-->

Step 1: Heating the glue layer

Turn on the hair dryer and direct the hot air flow to the edges of the back cover, holding it at a distance of 5-7 cm. Move the hair dryer around the perimeter of the phone, paying special attention to the corners and areas near the camera. Heat time: 2-3 minutes.

Signs that the glue has softened:

• 🌡️ The body became warm to the touch (but not hot!).
• 🔍 Under the light there are small gaps between the lid and the frame.
• 🎯 With a light press on the cover, a characteristic "creak" of glue is heard.

Step 2: Filting the cover with a mediator

Take a plastic pickup and gently insert it into the gap between the lid and the frame of the phone. Start at the lower left corner (there are fewer plumes there). Slowly drive the pickup along the edge, gradually lifting the lid.

If the lid doesn't lend itself:

• 🔥 Repeat the heating for another 1-2 minutes.
• 🔧 Try using a second mediator to fix the already raised part.
• ⚠️ Don’t apply excessive force – it’s better to heat it up again than to break the latches!

Step 3: Complete removal of the lid

When the lid is raised 2-3 mm around the perimeter, carefully remove it with the edges. Don't pull by the middle - so you can damage the fingerprint scanner plume (if you have one in your model).

After the lid is removed:

• 🧴 Remove the glue residues from the phone frame with isopropyl alcohol.
• 📸 Take a picture of the location of the plumes and screws (if you plan to further disassemble).
• 🔋 If you change the battery, disconnect it from the charge first thing!

⚠️ Attention: Some versions of Redmi 9 have a fingerprint scanner plume glued to the lid. If you tear it, the sensor will stop working! Before you remove the lid, check if the plume is reaching behind it.

Common Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when disassembling the Redmi 9, and here are the most common ones and ways to prevent them:

1. Battery overheating: If you heat your phone too long or at a high temperature (above 80°C), the battery can swell. Symptoms: the body becomes hot, there is a chemical smell, in which case immediately stop heating and let the phone cool for an hour.
2. Damage to the fingerprint scanner plume, which is often glued to the lid, and to avoid a cliff, check before you remove the lid, if a thin black wire is reaching for it, if so, carefully unplug it from the lid with your nail or plastic blade.
3. Using metal tools. Knives, screwdrivers, or even scissors can scratch plastic or tear plumes. Always use only plastic mediators!
4. If the phone doesn't turn on after repair, check it out: 🔌 Is the battery connected to the board. 🔧 Do you have all the slacks (but don’t pull them!). 📶 Will there be a slack between the lid and the frame.

If you doubt your abilities, it is better to contact the service center.The cost of dismantling Redmi 9 in most workshops does not exceed 500-1000 rubles, which is cheaper than repairing after an unsuccessful independent attempt.

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The most common cause of breakdowns in dismantling is haste. Heat the glue enough, but don't overheat, and use only plastic tools.

What to do after the lid is removed?

When the lid is successfully removed, the internal structure of Redmi 9 will open before you.

• 🔋 Battery replacement. The battery in this model is glued, so it needs to be heated before you take it off. ~1000-1500 rubles.
• 🧹 Dust cleansing. Use a soft brush or compressed air can to remove dust from the speaker, microphone and connectors.
• 🔧 If the camera, speaker or buttons are not working, check the integrity of the flexible plumes. You can replace them yourself (price: ~300-800 rubles apiece).
• 📱 Replacement of broken camera glass.Camera glass is often glued to double-sided tape.New glass stands ~200-500 rubles.

If you just wanted to see what's inside, or clean your phone, make sure to remove the old glue from the frame and the lids after you've inspected it. Use isopropyl alcohol and cotton swabs. The new adhesive layer can be bought as double-sided tape (e.g. 3M 9448A) or special glue for phones (e.g. B-7000).

When assembly, make sure that:

• 🔌 All the plumes were connected to the connectors on the board.
• 🔧 The screws were tightened cross-to-cross (to avoid skewing the lid).
• 📶 The antenna contacts on the lid coincided with the contacts on the board.

Alternative methods: when the standard method does not work

Sometimes the Redmi 9 lid is so tight that even after heating it can not be removed, in which case you can try alternative methods, but they require caution.

The thread method

This is a good way to do it if you don't have any mediators, and if you have a strong thread, like a dental thread, you can snag it under the lid from one of the corners, and then you can seep it around the perimeter, like a "razing" of glue, and you can't get the risk of cutting the plumes if the thread slips.

Adhesive solvent method

If the glue is too strong, you can put a few drops of acetone or white spirit into the gap between the lid and the frame. The solvent will loosen the glue, and the lid will be removed more easily.

• 🔥 The solvent can damage plastic or rubber seals.
• 💨 Acetone vapors are harmful to health – work in a ventilated room.
• 🔋 Do not allow liquid to hit the board or battery!

Vacuum-suction method

The suction cup helps you to lift the lid evenly after heating, glue it to the center of the lid, press it and pull it up. If the lid doesn't lend itself, don't exert excessive force, you'd better repeat the heat.

⚠️ Note: If none of these methods worked, don’t try to remove the lid by force. In some Redmi 9 batches (especially in 2020), the glue was applied with excess, in which case it is better to contact a service that uses professional tools (for example, iOpener for uniform heating).

FAQ: Frequent questions about the Redmi 9 disassembly