Xiaomi Redmi 8 is one of the most popular budget smartphones, but repairing it often requires care. The back of the device is attached to glue and latches, so improper disassembly can lead to cracks, damage to plumes or even battery failure. In this article, you will find detailed instructions on what tools to use, how to avoid typical errors and what to do if the lid does not respond.
Many users try to open the case with a knife or a screwdriver, which is the most common cause of breakdown, and we'll show you how to do it professionally, with minimal risk. The instructions are suitable for all the versions of the series: Redmi 8A, Redmi 8A and Redmi 8A Dual, because their design is identical. If you're planning to replace the battery, speaker or charging plume, start with this guide.
Preparation for disassembly: tools and security measures
Before you start, make sure you have everything you need, and not having one tool can turn a simple procedure into a nightmare.
- 🔧 Plastic mediators (2-3 - for tidy lids. Metal tools scratch the body!
- 🔥 Dryer or thermo-air station - for softening the glue (temperature 60-80)°C).
- 📱 Suction cups (optional) – help separate the cover after heating.
- ⚡ Screwdriver. T3 — screw-off.
- 🧴 Isopropyl alcohol 90%+ — glue-residue.
Also, prepare the workplace: the desk should be clean, no debris. Never take your smartphone apart on a carpet or soft surface - static electricity can damage the motherboard. If you work in high humidity (more than 60%), use an antistatic bracelet.
⚠️ Warning: Do not heat the body above 80°C, which can warp plastic or damage the battery. Use a dryer at minimum power and keep it at a distance of 10 to 15 cm.
Next Next post: How to Open the Redmi 8
Follow the algorithm in strict order. If you skip a step (for example, do not warm up the glue), the lid can crack.
- Turn off the phone and remove it. SIM-The battery should be charged no more than 30 percent, which will reduce the risk of fire when heated.
- Warm up the edges of the body with a hair dryer for 2-3 minutes, evenly driving along the perimeter. Start at the bottom (where the charging connector).
- Put the mediator in the gap between the lid and the frame. Start at the corner next to the power button, there are weaker latches. Carefully drive the tool along the edge, separating the glue.
- Lift the lid after the mediator has passed around the perimeter. If it doesn't respond, warm up for another 1 minute.
If the lid is lifted but not fully removed, don't force it! It can leave undetached glue or plumes underneath. In Redmi 8, the fingerprint scanner plume is glued to the lid, and it's easy to tear.
☑️ Checklist before lid removal
Common Mistakes and How to Avoid Them
Even experienced users make mistakes when disassembling, and here are the most dangerous ones:
| Mistake. | Effects of consequences | How to avoid |
|---|---|---|
| Use of a knife or metal screwdriver | Scratches on the frame, cracks in the lid, damage to plumes | Only plastic mediators or special shoulder blades |
| Overheating of the shell (>80°C) | Deformation of plastic, battery bloating | Control the temperature with a thermometer or tactile (the body should be warm, but not hot) |
| Sharp compartment of the lid | Breakage of the fingerprint scanner plume or speaker | Lift the cover slowly, checking for connected elements |
| Disassembly without battery shutdown | Short circuit when touching the board | After removing the lid, first disconnect the battery |
And if you pay special attention to the fingerprint scanner plume, it goes from the power button to the motherboard, and in 70 percent of cases, the breakdowns in the dismantling are related to it, and if the smartphone doesn't recognize the fingerprint after assembly, it's likely that the plume is damaged.
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Before the final removal of the lid, take a picture of the location of the plumes and screws - this will simplify the reverse assembly.
What to do if the lid is not removed?
If you warmed up the body, carefully led the mediator, but the lid still does not lend itself, two reasons are possible:
- The glue is too old and dried, which is what happens if the phone has been in use for more than 2 years. Solution: Increase the heating time to 5 minutes and use more isopropyl alcohol to dissolve the glue.
- The latches are not unlocked -- there are about 20 in Redmi 8, and if there's one that's locked, the lid won't move. Check the corners, the latches are the most stubborn.
If none of these methods worked, don't take any chances, call the service. Forced lid separation can cause a crack in the area of the camera or charging connector, which is expensive repair.
⚠️ Warning: If smoke or a strong smell comes out of the lid after heating, stop disassembling immediately! This is a sign of battery damage. Put the phone aside for 30 minutes and don't turn it on.
How to remove the glue after removing the lid?
Once the lid is successfully removed, you'll see sticky traces of glue on the frame and the lid itself, and they need to be removed, otherwise the leakage will be broken when you reassemble it.
- 🧴 Isopropyl alcohol is the safest option. Put it on a cotton-coated disc and wipe the surfaces.
- 🧼 Soap solution – suitable for removing fresh glue (if disassembly is carried out for the first time).
- 🔥 Fen + A plastic scraper for dried glue. Warm up the site and scrape the residue carefully.
Do not use acetone or gasoline-based solvents, which can damage plastic and rubber seals. After cleaning, wipe the surfaces with a dry wipe and let them dry for 10-15 minutes.
How to replace isopropyl alcohol?
Phone Builder: How to Put the Cover Back on?
If you've removed a battery replacement or repair cover, you need to lock it back in. Services use a special glue B-7000 or double-sided 3M 9448A tape, but you can use a regular superglue (dot it!).
- Apply the glue with a thin layer along the perimeter of the frame, retreating 1-2 mm from the edges (so as not to squeeze inside).
- Carefully apply the cover, starting from the top (where the headphone connector is).
- Press it evenly, avoiding distortions. For reliability, place a book weighing 0.5-1 kg on top for 10 minutes.
Don't turn the phone on immediately after assembly -- let the glue dry for 1-2 hours. Check if there's any gap between the lid and the frame. If there's any, disassemble the device and re-apply the glue.
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Use only silicone-based glue (e.g. B-7000) – it is elastic and will not damage plastic in future disassemblies.
When should I contact the service?
Not all breakdowns can be repaired by yourself.
- 🔋 Battery swollen or deformed - its replacement requires special equipment.
- 📱 After disassembly, the phone does not turn on or constantly restarts - the motherboard may be damaged.
- 🔊 The sound in the speaker or microphone is missing – this may be due to a plume break.
- 📲 Touchscreen works incorrectly (self-pressing, zones of insensitivity).
The cost of dismantling in the service usually does not exceed 500-1000 rubles, but you will get a guarantee for the work done. If you are not sure of your skills, it is better not to risk - repairing Redmi 8 after an unsuccessful self-disassembly often costs more than the original problem.