How to disassemble Xiaomi Mi9: a complete guide with photos and expert tips

Xiaomi Mi9 — The flagship smartphone of 2019, which is still popular today thanks to its powerful hardware and affordable price in the secondary market.However, over time, even such reliable devices require repairs, from replacing the battery to cleaning the connectors or recovering from a fall. Mi9 It has its own characteristics – here and fragile AMOLED-screen, and adhesive battery, and the risk of damaging antenna contacts. In this article, you will find a step-by-step photo instruction, a list of necessary tools, as well as critical warnings to help avoid typical errors.

It's important to understand that disassembling a smartphone is always a risk. Even with careful action, you can face loss of leakage of the body (IP53 in the Mi9 will not save from moisture after disassembling) or damage to the plumes. If you have never held a tweezer or a plastic blade, you better go to the service center. But if you are ready to try, read on. We will discuss the process from unscrewing the screws to removing the motherboard, paying attention to each step.

Preparation for disassembly: tools and security measures

Before you start, gather all the necessary equipment. Without the right disassembly tools, the Xiaomi Mi9 turns into a lottery — you can break the latches of the case or tear the plumes. Here is the minimum set you will need:

• 🔧 Set of screwdrivers (cross-haired) PH00, pentalobe P2 for screws under the back cover, flat for undercoating)
• 📱 Plastic blades/mediators (2-3 pc, thickness 0.2–0.4 mm for shell separation)
• 🔥 Dryer or thermo-air station (to soften the glue under the battery and screen)
• 🧲 Magnetic mat or container (in order not to lose the screws - their Mi9 more than 20!)
• 🩹 Isopropyl alcohol 90%+ (Cleaning contacts and removing glue residues)
• 🔋 Screen suction cup (optional, but simplifies the removal of the display)

Also, prepare your desk: clean, well-lit, and without static electricity (ideally an antistatic mat); turn off your smartphone 10 to 15 minutes before disassembly to keep your battery cool; if the battery is swelling, don't disassemble your phone yourself; and bloated Li-ion batteries can ignite when punctured.

⚠️ Attention: Xiaomi Mi9 It has hidden latches under the volume and power buttons. If you pull the lid by force, they will break! Use a plastic blade to gently detach the body around the perimeter, starting at the bottom edge.

Step 1: Removing the back cover

The back cover of the Mi9 is attached to glue and latches. To remove it, you first need to unscrew the two Pentalobe P2 screws, which are hidden under the plugs near the Type-C connector. Use a thin screwdriver or needle to fit the plugs - they are glued, but are removed effortlessly.

After removing the screws, heat the edges of the body with a hairdryer (~60°C) for 1-2 minutes. This will soften the glue. Then insert the plastic blade into the gap between the lid and the frame (start at the lower left corner where the antenna connector is). Carefully drive the blade around the perimeter, alternately snapping the locks. Do not apply force - if the lid does not respond, warm up again.

When all the latches open, remove the lid. Underneath it, you'll see:

• 🔋 Battery with connected plume
• 📶 Antenna contacts (do not touch them with metal tools!)
• 🔧 18 screws of different lengths (remember the location of each one!)
• 🖥️ Metal screen covering the motherboard

⚠️ Attention: Mi9 There's a fingerprint scanner plume underneath the screen, and if you're planning to take the display off, be careful, because it's easy to tear the plume when you're not moving gently.

Step 2: Shutting off the battery and removing the motherboard

Before you continue, be sure to turn off the battery.

1. Carefully tuck the black battery connector with a plastic spatula (it is located to the right of the battery).
2. Disconnect the plume by pulling it up perpendicular to the board.
3. Wait 30 seconds, and that will discharge the residual charge in the capacitors.

Now you can twist the screws that hold the metal screen over the motherboard. The screws are of different lengths, so we recommend that you arrange them in order (for example, on a numbered magnetic mat).

• 📱 Motherboard with Snapdragon 855 processor and memory
• 📷 Triple camera module (48 MP) + 12 MPs + 16 MPs)
• 🎤 The speaker and microphone at the bottom
• 🔌 Type-C connector on a separate plume

To remove the motherboard, disconnect all the plumes (screen, cameras, buttons, antennas) and use tweezers or plastic spatulas, putting connectors on the side instead of pulling the wires! After that, gently raise the board - it can "stick" to the heat paste on the processor.

Step 3: Removing the battery is the riskiest step

The battery in Xiaomi Mi9 is glued to the body with double-sided high-strength tape. To remove it, you will need:

1. Warm up the body with a hair dryer (70-80 ° C) for 3-5 minutes, evenly driving on the surface of the battery.
2. To expose the edge of the battery with a plastic spatula or a special sucker for batteries.
3. Carefully pull up, putting thin strips under the battery (for example, plastic cards) to prevent it from sticking back.

The Mi9 uses a battery with flexible contacts — if you pull it by force, you can tear off the ears of the mount or damage the thermistor (temperature sensor). If the battery does not respond, warm up again. Don't use metal tools — they can pierc the battery!

Step 4: Disassemble the screen and replace the display

Screen. Mi9 — it AMOLED-It is expensive to replace it (from 8 000 rubles in services), so if you decide to replace yourself, be extremely careful:

1. Warm up the edges of the screen with a hair dryer (60°C) for 2-3 minutes.
2. Suction the display from the bottom edge (there are no plumes).
3. Carefully drive the plastic shoulder blade along the long side, separating the glue.
4. When the screen rises by 1-2 mm, turn off the plumes: the display, fingerprint scanner and touch panel.

If you are changing the screen to a new one, check the compatibility of the model. The original displays for the Mi9 are marked DM-063 or DM-064. After installing the new screen, you may need to calibrate the color through the service menu (code ##6484##).

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If the fingerprint scanner doesn't work after you change the screen, check to connect a small white plume under the battery, which often flies away when it's not built properly.

Common Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when disassembling the Xiaomi Mi9, and here are the most common problems and ways to prevent them:

• 🔌 Type-C connector damage: occurs when you press the plume too much. Solution: turn off the connector by putting it on the side, not pulling the wires.
• 📵 Loss of mobile network: most often the antenna contacts are to blame. Solution - after assembly, check if the metal frame of the antennas fits tightly to the body.
• 🔋 Fast discharge of the new battery: if the battery goes down in a few hours, it is likely that it is not original or damaged the charge controller.Solution - buy batteries only labeled Xiaomi Original and check the voltage with a multimeter (should be) ~3.8–4.2V).
• 🖥️ Artifacts on the screen after assembly: usually it's a consequence of poor contact of the plume of the display. Solution - reconnect the plume and make sure it's not bent.

Another common problem is that the volume or power buttons are broken, and the reason is that there are small spring contacts under the lid, so if the buttons stop pressing after assembly, take the phone apart and check if the contacts have shifted.

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The most vulnerable part of the Mi9 when disassembling is the fingerprint scanner plume, which is thinner than the others and the location under the battery. Always turn it off last and plug it in first!

Building a phone: reverse order and testing

The Xiaomi Mi9 should be assembled in reverse order, but with some nuances:

1. Before installing the battery, clean the case of the remnants of old glue with isopropyl alcohol.
2. The new two-way battery tape should be thinner than the original (thick scotch can cause bloating).
3. Screw the screws cross-curl to avoid skewed boards.
4. After assembly, check the tightness of the case - if there are gaps, the moisture protection (IP53) will not work.

After turning on the phone, perform a full test:

• 📞 Check the calls and mobile internet (turn on) 4G customized).
• 🔊 Test the speaker and microphone (voice recording, music playing).
• 📸 Take photos on all cameras (wide-angle, main and telephoto lens).
• 🔋 Make sure the phone is charging (plug in the charger and check the indicator).
• 👆 Check the fingerprint scanner and touch screen at all corners.

If something doesn't work, don't panic. 90 percent of the time, it's re-disassembled and the plumes are checked, and if it doesn't turn on at all, check:

• Is the battery connected (sometimes the connector is not fixed to the end).
• Are the contacts closed on the motherboard (look for foreign objects).
• Is the power plume (thin red wire from battery to board) damaged?

FAQ: Frequent questions about the dismantling of Xiaomi Mi9