Disassembling the Xiaomi Redmi 8 is a challenge that owners face when replacing a battery, repairing a speaker or cleaning connectors. Despite its apparent simplicity, doing the wrong thing can damage plastic latches, plumes, or even the motherboard. This model, launched in 2019, has a specific body design with hidden mounts that require caution.
Unlike the flagship metal framed devices, the Redmi 8 is built on plastic clips and adhesive joints, which makes it easier to disassemble, but increases the risk of failure when exposed to rough. In this article, you will find a step-by-step photo instruction, a list of necessary tools, and unique adhesive layer tips that are not mentioned in standard manuals. If you are planning a hand repair, read on to avoid mistakes.
What tools will be needed to disassemble
Before you start dismantling the back cover, prepare a set of tools, and if you don't have one, it can make it difficult or damage. Here's the full list:
- 🔧 Plastic blade (or mediator) - to separate the body without scratches!
- 🔩 The screwdriver. PH00 — It's important to twist the screws: PH00 It's perfect, but PH0 may break the slime.
- 🧲 Magnetic mat or container to keep the screws small. Redmi 8 has 10 of them of different lengths.
- 🔥 Hair dryer or thermo-air station for softening the glue. Optimal temperature: 60-70°C (not higher!).
- 🧴 Isopropyl alcohol (90%+) — to remove glue residues from the frame and cover.
- 📦 Suction cups (optional) - help lift the lid after heating, but do not replace the shoulder blade.
If you don't have a thermophen, you can use a regular hair dryer, but keep it 10 to 15 cm away from the body so that the battery doesn't overheat, and a plastic card (like a discount card) can be used to cut it to the shape of a shoulder blade.
⚠️ Warning: Do not use knives or screwdrivers to separate the body! Even the gentle pressure of metal leads to microcracks on the plastic, which the later becomes a hotbed of breakages.
Preparing the phone for disassembly: what to do
Before you open the Xiaomi Redmi 8, follow a few critical steps, which can lead to data loss, short circuit, or even battery fire.
Turn off the phone and remove it. SIM-memory-card
Charge the battery to 30-50% (full charge is dangerous when heated!)
Make a backup copy of the data (photos, contacts, messages)
Remove the cover and protective film (if any)
Prepare the workplace: flat surface, good lighting-->
Pay special attention to the battery. If it is under 10%, the board can suddenly turn on when the plumes are connected, which can damage the components. On the other hand, a fully charged battery (100%) can deform or swell when heated with a hairdryer.
It is also recommended to wear an antistatic bracelet, or at least touch a grounded metal object before disassembling, and static electricity is one of the main causes of failure of chips on the motherboard.
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If you don't have an antistatic bracelet, wrap your hands in cotton gloves or periodically touch the heating battery.
Step-by-step: how to open the back cover
Now, the most important step is the separation of the back panel. In Xiaomi Redmi 8, it is mounted on 10 screws and adhesive layer around the perimeter.
- Heat the body. Turn the dryer on to the minimum power and evenly warm the back cover for 2-3 minutes, paying attention to the edges. The glue becomes elastic at 60-70 ° C.
- Separate cover. Insert the plastic blade into the gap between the cover and the frame (start with the lower left corner where the notch is located for the lid). SIM-Carefully drive the blade along the body, separating the latches.
- Latch control. Redmi 8 has 5 plastic clips on the sides and 2 metal latches on the top (near the camera).
- Final section. When all the clips are released, lift the lid, but don't remove it completely -- it's connected to the fingerprint scanner plume!
If the lid doesn't lend itself, don't force it. Go back to the hair dryer for another 1-2 minutes. A common mistake of beginners is to try to tear the lid off with a sharp motion, which leads to a plume break or cracks in the plastic.
What to do if the lid does not open?
Separation of plumes and battery recovery
Once the back cover is removed, you will see the Redmi 8's interior design, and it is important to be very careful, as the plumes are fragile and the battery can be blown up (which is dangerous!).
- Turn off the battery. With the shoulder blade, gently tuck the battery connector (it is located at the bottom of the board, next to the battery). USB-And disconnect it. That'll prevent short circuits.
- Remove the metal shield. It's mounted on 4 screws (unscrew them and remove the plate), and underneath it, there's a camera plume and a speaker.
- Disconnect the plumes. Use tweezers or a spatula to gently lift the latches of the connectors. In Redmi 8, the plumes are marked in color: red is the main camera, blue is the fingerprint scanner.
- Check the battery. If it's bloated, don't try to remove it yourself, go to the service center. The bloated battery could ignite!
Removing the battery will require a special suction cup or double-sided tape. Tuck the battery from the bottom edge and slowly pull up. If it does not respond, moisten the glue under the battery with isopropyl alcohol (no more than 2-3 drops) and wait 5 minutes.
⚠️ Warning: Never use metal tools to remove the battery! Even the slightest closure of the contacts can cause a fire. If the battery is deformed, pack it in a bag immediately and take it to the recycling point.
| Component | Number of screws | Type of attachment | Notes |
|---|---|---|---|
| Back cover. | 10 | Cross PH00 + glue | Wheels of different lengths - remember the location! |
| Metal board protection | 4 | Cross PH00 | Underneath it are hidden camera plumes and speakers |
| Battery | — | Glue + connector | For extraction, a bilateral scotch or suction cup is needed. |
| Maternity fee | 6 | Cross PH00 + latches | Turn off all plumes before extraction! |
Common Mistakes and How to Avoid Them
Even experienced craftsmen sometimes make mistakes when disassembling the Xiaomi Redmi 8, and here are the most common ones and ways to prevent them:
- 🔧 The screws are ripped off. Use the screwdriver strictly in size (PH00) And don't push too hard. If the screw doesn't twist, drop it on it. WD-40 And wait 5 minutes.
- 🔥 Battery overheating. Don't point the hair dryer directly at the battery -- heat only the edges of the lid. Optimal temperature: 60-70°C.
- 📱 The fingerprint scanner plume breaks. It's attached to the lid. Don't pull it upwards, first disconnect the card connector.
- 💧 Use isopropyl alcohol only to remove the glue from the lid and battery. It should not be on the chips.
- 🔌 Forgotten battery connector. Always turn off the battery before working with the board, or you risk burning it if you accidentally circuit.
Another common problem is the screws are confusing. In Redmi 8, they're of different lengths, and if you mix them up, you can damage the board or the screen, and to avoid that, you can either fold the screws on the magnetic mat in the order you twisted them, or sign them.
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The most vulnerable part of disassembly is the fingerprint scanner plume, which is thinner than paper and glued to the back cover. Always unplug its plug on the board BEFORE you remove the lid!
How to put your phone back together: Assembly tips
Assembling Xiaomi Redmi 8 after repair is no less responsible process than disassembly. Here it is important to observe the inverse sequence and take into account several nuances:
- Check all the connectors. Make sure the camera plumes, speaker and fingerprint scanner are tightly inserted into the connectors. They should snap with a click.
- Apply new glue. If the old glue is lost stickiness, use 3M double-sided tape or a special glue for smartphones (e.g. B-7000) and apply it with a thin layer around the perimeter of the lid.
- Turn the screws cross-cross. Start with the corner screws, then move to the center screw, and this will evenly distribute the pressure on the lid.
- Check all the modules. After you build, turn on the phone and test the camera, the speaker, the fingerprint scanner, the vibration. If something doesn't work, take the phone apart and check the plumes.
If you've replaced the battery, calibrate it after assembly: fully charge, then discharge before turning off and recharge it by 100%, which will extend the life of the new battery.
⚠️ Warning: Do not turn on the phone immediately after assembly if you have used isopropyl alcohol.Let it evaporate within 10-15 minutes, otherwise the pairs may damage the chips.
When is the best time to contact the service center
While the Xiaomi Redmi 8 is relatively simple to disassemble, there are situations where self-repair is impractical or dangerous.
- 🔋 Battery is bloated or leaking (risk of fire!).
- 📱 After a fall, the phone does not turn on or the screen flashes (may damage to the board).
- 💧 The board was hit by liquid (even if the phone is working, corrosion can occur later).
- 🔧 You have broken the latches of the cover or plumes (replacement of parts will be required).
- 🔍 Failure to diagnose the problem (e.g., the phone spontaneously restarts).
The cost of repairs at Xiaomi Service Center or Authorized Workshops is usually:
- Battery replacement: 1,500–2,500 ₽ (work).
- Screen replacement: 4,000–7,000 ₽ (depending on the display model).
- Board repair (for example, after moisture): 3000–10 000 ₽.
If you're not sure about your skills, it's better to pay for repairs than risk permanently breaking your phone, for example, mis-solding the plumes can cause the camera or sensor to lose function, and damage to the battery contacts can cause the battery to short circuit.
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Self-repair is only justified when replacing the battery, dynamics or cleaning the connectors. For complex work (soldering, replacement of chips) requires professional equipment.