The Xiaomi Mi Mix is a step-by-step analysis 2S: motherboard

Xiaomi Mi Mix 2S

Self-disassembly

detail

warning-and-warning

Many users are afraid to disassemble the Mi Mix 2S Because of the brittle ceramic body and the complex mounting system, there are no traditional screws under the back cover, and instead of using adhesives and latches, and improper exposure can lead to cracks or damage to the plumes. But with the right approach, it takes 30 to 40 minutes to disassemble, and the key is to follow the sequence and take your time. If you've never taken a smartphone apart before, practice on a simpler model or watch video disassembly before you start.

In the article you will find:

• 🔧 Complete list of tools (including alternatives to professional devices)
• 📸 Step-by-step process with photos and explanations of each stage
• ⚠️ Critical errors that cause the device to break down
• 🔄 Tips for reverse assembly and performance check

1.Preparation: tools and safety

Before the dismantling of the Xiaomi Mi Mix 2S Make sure you have everything you need. Not even one tool can make it a nightmare. For example, without a plastic mediator, you risk scratching the body or tearing the plumes, and without a sucker, you risk breaking the latches of the back cover.

Here is the minimum set you will need:

• 🔩 Set of screwdrivers (cross-haul) PH00, flat 1.5 mm, five-pointed Y00 back-coat)
• 🧲 Suction cup (diameter 5-7 cm) for separation of the back panel
• 📏 Plastic mediators (or guitar mediators) to disengage the body
• 🔥 Hair dryer or thermo-air station (for softening glue)
• 🧴 Isopropyl alcohol 90%+ (cleaner)
• 📦 Container for screws (so as not to lose small parts)

If you are planning to replace the battery or screen, prepare:

• 🔋 New battery (original or qualitative analogue, for example, from Baseus or ZMI)
• 🖥️ Double-sided Scotch (for battery fixation if the original glue has lost properties)
• 🔌 Multimeter (to check battery voltage before installation)

⚠️ Warning: Don't use metal tools to separate the back cover! ceramic case Mi Mix 2S It's extremely fragile and can crack from point pressure.

Also, before disassembly, be sure to discharge the battery to 25-30%. A fully charged battery can ignite if it accidentally breaks. If the battery is swelling, do not disassemble the smartphone yourself!

2 Removal of the back cover: combating glue and latches

The most critical step is to separate the back panel, where many people make mistakes that cause cracks or damage to antenna lines, and the key is that the glue that's glued to the lid needs to be softened with heat, but not overheated!

Step-by-step:

1. Turn off your smartphone and remove the tray for SIM-map.
2. Then put the suction cup on the bottom of the back cover (closer to the connector). USB-C).
3. Heat the edge of the body with a hair dryer around the perimeter for 2-3 minutes. Temperature - 60-70°C (not higher!).
4. Carefully pull the sucker up, while putting the lid on with a plastic mediator.
5. Once a gap appears, run the mediator along the entire perimeter, separating the latches.

If the lid doesn't lend itself, don't force it! Reheat it again. The main mistake of the beginners is to try to tear the lid off without first softening the glue.

• 💀 Cracks on ceramics (especially in corners)
• 📡 Damage to antenna contacts (network loss after assembly)
• 🔌 Breakage of the battery plume (smartphone will not turn on)

Heated the body around the perimeter|Suction cup is tightly glued|Mediator ready to split|The lids are not opened (they are not!)-->

When you take the lid off, you'll see the internal structure: the battery, the motherboard, the camera and the plumes. Don't touch the metal parts with a screwdriver, it can cause a circuit. If there's dust on the board, remove it with a soft brush.

3.Switching off battery and plumes: why it's critical

Before you continue disassembling, be sure to turn off the battery. Even when it is off, the circuit board still has a voltage, and an accidental circuit can disable the power controller or processor. 2S The battery connector is located at the bottom of the board and closed with black insulation tape.

How to turn off the battery:

1. Carefully put the insulation tape on the battery connector.
2. Use a plastic mediator to lift the connector up.
3. Make sure that the contacts do not come into contact with the body.

Once the battery is off, you can start removing the plumes. 2S three:

⚠️ Attention: Trains in Mi Mix 2S Don't pull them by the wires, just by the plastic connector, if the contacts are bent, straighten them carefully with tweezers.

If you're planning to replace the screen, you can move on to take it off at this point.

1. Unscrew 4 screws that fix the metal frame of the display.
2. Heat the screen around the perimeter with a hairdryer (temperature 50–60)°C).
3. Substitute the screen with a plastic spatula, starting at the bottom edge.

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If the plume doesn't detach, don't use force. It's probably glue-locked. Put the isopropyl alcohol on the connector and wait 10 seconds to dissolve the glue.

4. Motherboard extraction: screws and hidden fasteners

Motherboard in Mi Mix 2S It's fixed with 12 screws of different sizes, and you have to remember where they are, because you have to put the screws in their place, or you don't have to put the board tightly on the body, so you can take a picture of the board before you take it out, or you can use a circuit:

Screwing order:

1. Two screws under the battery (long, Y00).
2. Four screws at the corners of the board (short, PH00).
3. Six screws along the edges (average length, PH00).

Once you unscrew the screws, you can gently raise the board by the edges, it can stick to the body because of the thermal paste on the processor, and don't use metal tools to separate, just plastic blades.

On the back of the board you will see:

• 📱 Snapdragon 845 processor (under metal screen)

⚠️ Warning: If you notice bloated or leaked capacitors on the board, do not turn on the smartphone after assembly! This is a sign of a short circuit and the device may fail permanently.

5 Battery Replacement: Nuances and Alternatives to the Original

Battery in the Mi Mix 2S — One of the most vulnerable areas, and after 3-4 years of use, it drops in capacity by 30 to 40 percent, and bloating can damage the screen.

Step-by-step process:

1. Unplug the protective film from the battery (it fixes the plume).
2. Put a plastic blade on the battery from any angle, so don't put metal in the battery, it can cause fire!
3. If the battery is glued heavily, use isopropyl alcohol to dissolve the glue.
4. Install a new battery by fixing it with double-sided tape.

When choosing a new battery, pay attention to:

• 🏭 Manufacturers: Reliable Brands – Baseus, ZMI, Patona.

After replacing the battery, be sure to check it with a multimeter. the voltage should be in the range of 3.7-4.2 V. If the indicator is below 3.5 V, the battery is discharged and needs to be charged before first turning on.

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Never use a battery if it is swollen or has visible damage. Even if the smartphone turns on, the risk of fire remains high.

6. Screen replacement: difficulties with glue and sensor

The Mi Mix screen 2S — It's not just a display, it's also a touch layer glued together. You can't use a screen from the Mi Mix 2 when you replace it -- the connectors and the sizes don't match! The original module is expensive, but cheap ones often have color rendering or multi-touch problems.

Replacement algorithm:

1. Remove old glue from the frame and apply new (for example, B-7000).

After changing the screen, check:

• 🎨 Color rendering (whether yellow or broken pixels)
• ☝️ Sensor operation (multi-touch, gestures)
• 🔦 Brightness (are there any darkened areas)

⚠️ Warning: If the smartphone doesn't turn on after changing the screen, check the plume connection. Often the problem is bent contacts or loose fit of the connector.

7. Backup Assembly: How to Avoid Errors

Assembly of Mi Mix 2S It should be in reverse order, but taking into account a few nuances:

• 🔩 Screws: Make sure all 12 screws are screwed into their places. One extra screw can close the board!
• 🧲 Trains: Make sure all connectors are tightly snapped (a characteristic click should be heard).
• 🔋 Battery: before fixing, make sure that its plume is not bent and clamped with the body.

Before the final assembly, turn on the smartphone in disassembled form (without the back cover) and check:

• 📶 Network (antennas must catch the signal)
• 📸 Cameras (are there artifacts in the photo)
• 🔊 Sound (speakers and microphones working)

If everything works, stick the back cover carefully.

1. Apply a thin layer of glue B-7000 perimeter.
2. Press the lid and fix it with tape for 10-15 minutes.
3. Place your smartphone under a press (such as a stack of books) for 1-2 hours.

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If the smartphone warms up more than usual after assembly, check the heat paste on the processor.

8.Frequent problems after disassembly and their solution

Even with a careful disassembly, there can be problems, and here are the most common ways to fix them:

If after assembly the smartphone is not charged, the reasons may be as follows:

• 🔌 Bend the connector. USB-C (need to be soldered)
• 🔋 Charging controller is faulty (charge diagnosis required)
• 🔄 Flown the firmware (try to reflash through Fastboot)

In most cases, problems are solved by re-disassembling and checking contacts. If you are not confident in yourself, contact the service center with a description of the symptoms.

FAQ: Answers to Frequent Questions