Disassembly Xiaomi Redmi Note 7: how to carefully remove the back cover

Removing the back cover of the Xiaomi Redmi Note 7 is the first step in most repairs, from battery replacement to cleaning connectors. However, the design of a smartphone with adhesive panel mounting requires a special approach. Dismounting errors can lead to damage to the plumes, cracks in the glass or even failure of the sensors. In this article, we will discuss three proven methods of disassembly suitable for both beginners and experienced users.

The Redmi Note 7 (codenamed lavender) stands out among Xiaomi’s budget smartphones with a sturdy Gorilla Glass 5 case, but this property makes it difficult to disassemble. Unlike plastic lids, the glass panel requires uniform heating and precise application of force. We will describe each stage in detail, specify critical risk areas (such as the area near the camera), and give recommendations for the choice of tools.

Preparation for disassembly: tools and security measures

Before you start dismantling, you need to assemble a set of tools, and the quality of the tools is responsible for 80 percent of the success of the operation.

• 🔥 A hair dryer or a thermo-air station (at least 1,000 watts) to soften the glue, even a household hair dryer, but with temperature adjustment, will do.
• 📱 Plastic mediators (2-3 pieces) with a thickness of 0.1-0.2 mm. Metal blades can scratch glass.
• 🧲 A 4-5 cm diameter suction cup with a rubberized base, it is important that it fits snugly to the surface.
• 🔧 Screwdriver. T3 for twisting screws (Redmi Note 7 uses screws with a cross-shaped slime).
• 🧴 Isopropyl alcohol 90%+ Acetone or solvents won't work, they can damage seals.

Also prepare the workplace:

• 🪑 Work on a flat surface with good lighting, and a white tablecloth is perfect, so it's easier to spot the screws that have fallen.
• 📦 Put the tools in order of use. For example, left to right: hair dryer. → sucker → mediator → screwdriver.
• 🔋 Make sure the battery is discharged to 20 to 30 percent, which will reduce the risk of short circuits in case of accidental damage to the contacts.

⚠️ Warning: Do not use knives or other sharp objects to lick the lid.Even a micro-crack on the glass can cause the panel to collapse completely when heated.

Method 1: Classic disassembly with heating (recommended for beginners)

This method is suitable for most users, as it minimizes the risk of damage to the internal components, the basic principle is uniform heating of the adhesive layer to a temperature of 60-70 ° C, at which it becomes elastic.

Step-by-step:

1. Turn off your smartphone and remove the tray for SIM-This will prevent dust from entering the enclosure.
2. Heat the back cover with a hair dryer for 2-3 minutes, holding it at a distance of 5-7 cm. Movements should be circular, without delay in one area. Pay special attention to the edges and corners - there the glue is applied more abundantly.
3. Install the suction cup closer to the bottom edge (near the USB-C connector). Press to create a vacuum.
4. Carefully pull the suction cup up while putting the lid on with a plastic mediator. Once a gap of 1-2 mm appears, insert a mediator into it.
5. Swipe the mediator along the edge, gradually increasing the gap. Take your time, the glue may be unevenly softened.

If the lid fails, repeat the heat for another 1-2 minutes. The main thing is not to apply excessive force. In the Redmi Note 7, the most vulnerable areas are:

• 📸 Area around the main camera (there are sensor plumes).
• 🔊 Top edge (near the speaker) where the glue is often applied in a thick layer.

Is the phone off?|Is the tray removed? SIM-map?|Are plastic mediators ready?|Checked the temperature of the hair dryer (not higher than 70)°C)?|Is there a suction cup on hand?-->

Method 2: Disassembly with thread (for experienced users)

This is a good way to do it if you don't have a hair dryer or you're afraid of overheating your smartphone, and instead of heating it uses a strong thread (for example, a guitar string or a fishing line 0.3-0.5 mm thick) that cuts through the adhesive layer mechanically.

Algorithm of action:

1. Secure one end of the thread on the bottom edge of the lid with scotch.
2. Carefully draw the thread along the edge, slightly pulling it. The movements should be smooth, without jerking.
3. Once the thread passes 2/3 of the perimeter, slap the cover with a mediator and separate it completely.

Advantages of the method:

• ✅ No risk of battery or display overheating.
• ✅ Suitable for smartphones with damaged glass (if cracks do not block access to the edges).

⚠️ Attention: The thread may be able to pick up antenna plumes around the perimeter of the body, so if you feel resistance, stop moving and try another area.

What to do if the lid is not removed?

Sometimes even after heating, the lid remains tightly glued, and here are the possible causes and solutions:

• 🔥 Underheating: Repeat the procedure by paying attention to the corners. Use thermocouples to control the temperature (optimum 60-70)°C).
• 🧴 Old or too strong glue: Some Redmi Note 7 batches use glue B-7000, which requires a higher temperature (up to 80)°C. Be careful at 90.°C+ plastic frame may be deformed.
• 🛠️ Damaged latches: If the phone fell, the internal plastic clips could break, and only a careful threading of the glue would help.

If nothing helps, try the combination method:

1. Heat the cover with a hair dryer for 3 minutes.
2. While the glue is warm, thread one edge.
3. Put the lid on with a sucker and a mediator.

Disassembly without damage: tips from the masters

Experienced repairmen share a few tricks that will help avoid typical mistakes:

• 🕒 Take your time: Average disassembly time for beginners is 20-30 minutes. If you hurry, the risk of damage increases 3 times.
• 📏 Control the depth of the mediator: It must penetrate no deeper than 1-2 mm, otherwise you can touch flexible plumes.
• 🔄 Alternate heating and mechanical action: Heat for 1-2 minutes, then try to separate the lid.

Pay special attention to the fingerprint scanner plume that attaches to the back cover. In the Redmi Note 7, it is located under the top of the panel and can come off if you move sloppy, and if that happens, the scanner will stop working, and it will cost 800-1,200 rubles to replace it.

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Before the final removal of the lid, take a picture of the location of the plumes and screws. This will help to properly assemble the smartphone back and avoid “extra” parts after repair.

Build the phone after repair: how to seal the lid back?

Once the repair is complete, the lid must be re-fixed, and you can't use the old glue, because it loses its properties when heated.

• 🧴 Double-sided scotch 3M VHB (0.5 mm thickness) or glue B-7000.
• 🧼 Isopropyl alcohol for degreasing surfaces.
• 📏 Plastic scraper for uniform pressing of the cover.

Step-by-step:

1. Clean the body and lid of the residue of old glue with alcohol. Dry for 5-10 minutes.
2. Apply a new glue with a thin layer along the perimeter of the body, retreating 1-2 mm from the edges (so as not to squeeze out when compressed).
3. Carefully install the lid, combining holes for screws and connectors.
4. Press it evenly, from the center to the edges. Use a scraper to avoid bubbles.
5. Twisting the screws (but not until the end!) and leaving the phone under the press (for example, under a stack of books) for 1-2 hours.

⚠️ Warning: Do not turn on the smartphone immediately after assembly. Let the glue fully polymerize (at least 12 hours), otherwise the cover may move away when heated during operation.

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For reliable fixation of the cover, use the glue B-7000 - it is elastic and withstands repeated heating, unlike conventional superglue.

Frequent Mistakes and How to Avoid Them

Even with careful disassembly, users often make mistakes that lead to additional costs, and here are the most common ones:

If you damaged the plume or other component, do not try to repair it yourself without experience. In Xiaomi service centers, the cost of replacing the plume of the fingerprint scanner starts from 800 rubles, and replacing the rear cover as a whole - from 2500 rubles. For comparison: the new Redmi Note 7 on the secondary market costs 6000-8000 rubles, so sometimes repair is not economically feasible.

FAQ: Answers to Frequent Questions