How to disassemble Xiaomi Redmi 8 yourself: instructions with photos and warnings

Xiaomi Redmi 8 is one of the most popular budget smartphones of 2019, but even it is not immune to breakdowns. The screen does not respond to touches? The battery runs out quickly? Or just want to clean the device from dust? In these cases, disassembling the case can be the first step to repair. However, improper dismantling often leads to damage to plumes, cracks on the board or loss of leakage. In this guide, we will detail how to disassemble the Redmi 8 without risking it into a brick, what tools will be required and what to pay attention to.

It's important to understand that Xiaomi didn't design this smartphone for custom repairs, there's no removable battery like the old Redmi Note 3, and the back cover is glued around the perimeter. However, with care and proper preparation, the procedure is quite feasible at home. We'll look at two disassembly options: partial (battery replacement/dynamics) and full (access to the motherboard), and we'll also tell you what mistakes beginners most often make and how to avoid them.

Preparation for disassembly: tools and security measures

Before you start the screwdriver, make sure you have everything you need. The Redmi 8 is not an iPhone where you can do with a single suction cup, but you don't need professional equipment.

• 🔧 Plastic mediators (2-3 (S) - for the removal of the lid without scratches.
• 🔩 The screwdriver (PH00 or PH0) — screw-hole.
• 🔥 Dryer or thermo-air station - for softening the glue (temperature 60-80)°C).
• 📱 Suction - will help to lift the lid after heating.
• 🧴 Isopropyl alcohol (90%+) — glue-cleaner.
• 🔋 New glue, for example, B-7000) — If you plan to collect back.

⚠️ Warning: Do not use metal tools to separate the cover! Even a gentle movement can leave microcracks on the aluminum frame, which will subsequently lead to loss of antenna signal (especially important for models with support). 4G+). Avoid overheating if the temperature is above 90.°C. There is a risk of damage OLED-screen (in versions with AMOLED) plume-detachment.

Before starting work, it is mandatory to:

1. Turn off your smartphone and remove it. SIM-map + memory-card.
2. Discharge the battery to 20-30% – this will reduce the risk of fire in case of accidental circuit.
3. Make a backup of your data (via Mi Cloud or ADB).

Step 1: Removing the back cover is the most important step

The Redmi 8's back is glued around the perimeter, and the top is further latched, and the main mistake of the newcomers is to try to plug the lid from the corner without first heating, which almost always ends in a crack of plastic or damage to the antenna contacts.

Algorithm of action:

1. Heat the back cover with a hair dryer (hold at a distance of 5-7 cm, evenly driving on the surface for 2-3 minutes). The glue should become elastic, but not melt.
2. Apply the suction cup closer to the bottom edge (where the USB-C connector is located) and gently pull up. If the lid fails, repeat heating.
3. Insert a plastic mediator into the gap and slowly lead along the edge, separating the glue. Be especially careful in the area of the camera - there are antenna tracks!

The critical thing is, underneath the top of the lid, there are latches that are easy to break, so if you feel resistance, don't push harder, but heat that area again.

The cover is evenly heated (60-80°C) |

The suction cup is snugly attached to the surface |

The mediator is inserted no deeper than 1-2 mm |

No sudden movements in the camera area-->

Step 2: Shutting down the battery – why do it first

Once the lid is removed, your first instinct may be to unscrew the motherboard screws immediately. This is a gross mistake! The battery in Redmi 8 is plugged into the board permanently, and any circuit (such as a screwdriver touching the contacts) can lead to:

• 🔥 Short circuit and combustion of the power controller.
• 💥 Battery bloating (especially if it is already worn out).
• 📵 Poose. IMEI (if the module is damaged RF).

To turn off the battery:

1. Find a black plume with a red marker (usually located to the right of the battery).
2. Carefully tuck it with a plastic spatula - the connector is fixed with a latch that you need to lift.
3. Make sure that the contacts do not come into contact with the body (you can glue tape).

⚠️ Attention: If the battery is blown up (as seen by the bulge of the lid), do not try to remove it yourself! The risk of fire when lithium polymer cells puncture is extremely high.

Step 3: Removing the battery – when you need a replacement

The battery in the Redmi 8 (BM47 model, capacity 5000 mAh) is glued to the body with double-sided tape.

1. Fill the battery with a plastic spatula from any angle.
2. Carefully pull on the black tape (traction strap), trying not to damage the cell.
3. If the tape is broken, use isopropyl alcohol to dissolve the glue (it will be useful to heat the battery to 40 ° C).

Signs that the battery should be changed:

• ⚡ Smartphone discharges in 3-4 hours with moderate use.
• 🔌 Charging jumps (for example, from 80% immediately to 100%).
• 🌡️ The body warms up in the battery area even without loading.
• 📉 In Mi Battery Health, the capacity is less than 80%.

💡

If you are changing your battery, choose the original battery with the MBJ405740 or certified analogues from Patona or Baseus. Cheap Chinese copies often have real capacity 20-30% below the declared.

Step 4: Dismantling the motherboard – Access to all components

If you need to get to a speaker, a charger or a camera, you'll have to take out the motherboard.

1. Unscrew all the screws (there are 12 pieces, of different lengths – remember the location of each!).
2. Disconnect the plumes: 📸 Main and front cameras. 🔊 Dynamician and microphone. 📶 Antenna contacts (2 pcs.).

Carefully tuck the board on the side with a plastic spatula. Don't pull around the corners - there are fragile elements there!

⚠️ Warning: The Redmi 8 board has a Qualcomm Snapdragon 439 chip that is sensitive to static electricity. Make sure to touch an earthed object (such as a heating battery) or use an antistatic bracelet before working.

1. Is the battery plume connected?

2. Are the contacts closed on the board (look under the magnifying glass).

3. whether the antenna wires are properly installed (they are easily confused!).-->

Step 5: Disassemble the front panel – screen and sensor

Replacing the screen with the Redmi 8 is one of the most difficult procedures, because the display and the touch module are all combined into a single unit (OGS-The plume runs under a metal frame. If you've never worked with Xiaomi displays, you should trust the professionals.

If you decide, follow the instructions:

1. Heat the screen around the perimeter (temperature 70-80 ° C).
2. Tap the display with a plastic spatula, starting at the bottom edge (where the Home button is located, if any).
3. Disconnect the display plume (it is fixed by a latch, as well as the battery).
4. Remove the metal frame that holds the screen (screws under the cross screwdriver).

Typical problems after changing the screen:

• 🖥️ White stripes - damaged plume or contacts.
• 👆 The touchscreen is not working – the touch controller is not connected.
• 🔍 Autobrightness is not regulated - the illumination sensor is damaged.

Frequent Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make annoying mistakes when disassembling the Redmi 8.

1. If you hold the hair dryer too close, the plastic will deform and the glue will drip in, so you can use a thermometer or heat it in short intervals (30 seconds).
2. The screws in Redmi 8 are different lengths, so if you mix them up, you can damage the board. Solution: spread them out on the magnetic substrate in order of twisting.
3. The plumes are damaged. The camera and display plumes are thinner than paper. Solution: just prick them with a plastic tool.
4. Ignoring antenna contacts. If you forget to connect the antenna, the smartphone will lose the network. Solution: check the connections from the photo before disassembly.

💡

If the smartphone does not catch the network after assembly, the antenna contact most likely left. In Redmi 8, there are two of them: the main one (for the camera) and the additional one (for the USB-C connector).

FAQ: Answers to Frequent Questions