How to disassemble Xiaomi Mi 9: detailed instructions with photos and nuances

Deconstructing the Xiaomi Mi 9 is a challenge that owners face when replacing a battery, screen or other internal components. Despite its apparent simplicity, the procedure requires accuracy and knowledge of the design features of the model. This smartphone, released in 2019, has a number of nuances: a glued case, a fragile plume of a fingerprint scanner under the screen and a complex motherboard mounting system. Without proper preparation, the risk of damage to the device reaches 70%, especially on the first experience of disassembly.

In this article, you will find a step-by-step guide with photos of key stages, a list of necessary tools and unique tips that you will not find in standard instructions. We will also discuss common errors (such as damage to a flexible camera cable when it is not opened neatly) and how to avoid permanent damage to the microphone due to static electricity, a problem that even experienced craftsmen keep silent about. If you are planning to replace the battery EMMC5.1 or repair Type-C connector, this guide will save time and nerves.

Before you start, evaluate your strength: parsing the Mi 9 is more difficult than a model with a removable back cover (for example, the Redmi Note 8). If in doubt, contact the service center. But if you decide to act on your own, follow the instructions carefully: every step is important.

Preparation: security tools and measures

The Xiaomi Mi 9 will require a specialized toolkit to parse, and using improvised tools (knives, screwdrivers of the wrong size) is almost guaranteed to cause scratches on the body or damage to the plumes.

• 🔧 Plastic blades (2-3 pieces, 0.2-0.4 mm thick) - for separation of the back cover.
• 🔨 Cross screwdriver PH00 (magnetic) - for the screws of the motherboard.
• 🧲 Suction cup (∅50–60 mm – helps to lift the cover after warming up.
• 🔥 Dryer or thermo-air station (temperature 70-80)°C) - for softening the glue.
• 📦 Container for screws - so as not to confuse the mounts (in Mi 9 there are 12 pieces of different lengths!).
• 🧤 Antistatic bracelet – protection against damage to chips by static electricity.

Pay special attention to temperature. Overheating of the housing above 90°C deforms plastic clips inside, and insufficient heating (below 60)°C) will not soften the glue, the cover will not respond.

⚠️ Attention: Don't use metal blades! In the Mi 9, the antenna tracks are located along the ends of the body. NFC or wifi.

Before the examination, it is mandatory:

1. Turn off your smartphone and remove it. SIM-map.
2. Discharge the battery to 20-30% (full charge is dangerous in case of accidental circuit!).
3. Remove the cover and protective film (if any) - they interfere with warming up.

Step 1: Removing the back cover

The most important step is to detach the lid. In the Xiaomi Mi 9, it is glued around the perimeter and additionally fixed with 18 plastic clips. If you pull the lid by force, the clips will break, and the body will dangle after assembly.

Procedure:

1. Warm up the body around the perimeter (especially corners!) for 2-3 minutes, keeping the hair dryer at a distance of 5-7 cm.
2. Suction suction the bottom of the lid (near the Type-C connector) and pull up.
3. In the resulting gap, insert a plastic shoulder blade and slowly lead it along the end, separating the glue.
4. Repeat the procedure for all sides. Clips should come out of the grooves without resistance.

If the lid doesn't lend itself:

• 🔥 Warm up the problem area for another 30 seconds.
• 💧 Drip isopropyl alcohol (90%+) into the gap, it dissolves the glue.
• ⚠️ Don't use force! The broken clips will have to be glued with superglue, which will complicate future debriefings.

After removing the cover, you will see:

• 🔋 Battery with connector JST 1.0 (black connector).
• 📸 Triple camera module (main camera module) + wide-angle + telephoto).
• 📶 Perimeter antenna tracks (do not touch them with metal objects!).

Is the cover evenly separated from all sides?|Are there any cracks in the body?|All the clips are intact (check visually)?|Whether the battery is switched off (see next step)?-->

Step 2: Disconnect the battery and remove the motherboard

Before you touch any components, be sure to turn off the battery. The Mi 9 uses a latch connector, so you have to shovel it on the side and pull it up, and if you just pull the wires, the connector will break!

Instructions for charging:

1. Unscrew 12 screws (noted in the photo below) screws of different lengths - remember the location of each!
2. Then, make sure to keep the right hand side of the sleeve.
3. Disconnect the plumes: 📱 Display plume (white latch). 🔍 Fingerprint scanner plume (black latch). 🎤 Microphone plume and speaker (orange connector).

Common mistakes at this stage:

• ❌ Mixed screws - long screws in short holes damage the board.
• ❌ The fingerprint scanner plume is ripped off - it's brittle and glued to the screen.
• ❌ Forgot to disconnect the antenna cable (thin black wire at the top edge of the board).

⚠️ Warning: The Mi 9 has a second layer of glue underneath the board, which locks the battery. If you're planning to replace the battery, don't pull it by force: warm up the back of the case first (10-15 minutes after the charge is removed).

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If the screws are “rigged” and do not unscrew, drop on them. WD-40 And wait 5 minutes. Don't use pliers. The snails that are ripped off will make it harder to assemble.

Step 3: Replace the battery (optional)

The battery in Xiaomi Mi 9 is one of the most vulnerable places. After 2-3 years of active use, its capacity drops by 30-40%, and the original batteries MDY11EM It's expensive. It's 3 to 5 times cheaper to replace it if you make it yourself.

Step-by-step process:

1. Disconnect the battery connector (as described above).
2. Warm up the case from the back (from the screen) to 70.°C - this will soften the glue under the battery.
3. Tap the battery with a plastic card (not metal!) from any angle and slowly pull up.
4. If the battery fails, use isopropyl alcohol - it dissolves the glue B-7000, Xiaomi is fixing the batteries.

Important:

• 🔋 The new battery should be the same model (MDY11EM or analogue with identical parameters: 3300 mAh, 4.44V).
• 🔌 Before installation, clean the contacts with alcohol - oxidation worsens the charge.
• 📏 Check the thickness of the new battery: it should not exceed 3.85 mm, otherwise the lid will not stand in place.

After replacing the battery, be sure to calibrate the charge controller:

1. Charge the phone to 100%.
2. Turn off the charge and use until full discharge (off).
3. Repeat the cycle 2-3 times.

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Do not use batteries from other Xiaomi models (e.g. Mi) 9T) — They have a different voltage and can damage the charge controller.

Step 4: Screen Display Display Replacement

Replacing the screen with the Xiaomi Mi 9 is one of the most difficult procedures because of the under-display fingerprint scanner. If you damage the plume, the touch-id will stop working, and this module is not sold separately. So act very carefully.

Procedure:

1. Warm up the screen around the perimeter (temperature 60-70)°C).
2. Subdense the display with a plastic spatula, starting from the lower right corner (there are fewer plumes).
3. Unplug: 📺 Display plume (white latch). 👆 Fingerprint scanner plume (black latch, glued to screen!). 🔊 Dynamic plume (orange connector).

Typical problems:

• ❌ Fingerprint scanner plume is off - screen will work, but Fingerprint is not.
• ❌ The flexible backlight cable is damaged - the screen glows unevenly.
• ❌ The remnants of glue under the new screen - there will be divorces when pressed.

When installing a new screen:

1. Check Compatibility: Original Display Marked Tianma NT36672A.
2. Apply a new double-sided tape (thickness 0.1–0.15 mm) around the frame perimeter.
3. Connect the plumes in reverse order and check the operability before final assembly.

⚠️ Warning: If you've got yellow spots after you've changed the screen, you've overheated the matrix. AMOLED-panel sensitive to temperatures above 80°C. Solution: Replace the screen with a new one (the spots won't disappear over time).

Step 5: Replace Type-C connector or dynamics

The Type-C connector and the bottom speaker in the Mi 9 are frequent victims of sloppy handling, the connector fails after 500 to 1,000 connections (especially when using poor-quality cables), and the speaker suffers from dust or moisture.

How to replace the Type-C connector:

1. Disconnect the battery.
2. Unscrew 2 screws fixing the metal plate above the connector.
3. Tap the connector with a spatula and solder it off with a soldering hair dryer (temperature 350)°C).
4. Install a new connector (original – Xiaomi) 1802-0139) And solder your contacts.

To replace the speaker:

1. Unplug the protective film over the speaker (it is glued to the body).
2. Disconnect the plume (orange connector).
3. Put the speaker on the shoulder blade - it is held on glue.
4. Install a new (compatible) model: AAC 201-00198-00 GoerTek GTK-2016>).

Post-replacement check:

• 🔌 Connect charging - the connector should hold the cable tightly, without backlash.
• 🔊 Turn on music – the sound should be clear, without wheezing.
• 📶 Check it out. OTG — plug in the flash drive.

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If after replacing the connector, the phone does not charge, check the capacitors near the USB-port (marking) C1608). They are often touched by soldering, which leads to a short circuit.

Assembly and testing

The Xiaomi Mi 9 should be assembled in reverse order, but with a few nuances in mind:

• 🔧 Screw the screws cross-cross so that the charge rises exactly.
• 🧲 Before installing the cover, clean its inner side of the old glue (use isopropyl alcohol).
• 🔥 Warm up the new hair dryer cover glue (temperature 50)°C) so he can grab better.

After assembly, be sure to test:

1. Screen: Check for broken pixels and touch screen sensitivity.
2. Cameras: Take a photo on the main, wide-angle and telephoto cameras.
3. Fingerprint scanner: Add a new fingerprint and check the recognition speed.
4. Sound: Call your phone and check the microphone and speaker.
5. Network: Make sure you catch 4G, Wi-Fi and Bluetooth.

If something's not working:

• ❌ Not turned on: check battery connection and power button.
• ❌ The touchscreen does not work: reconnect the display plume.
• ❌ Cameras give out an error: clean the contacts of plumes with alcohol.

⚠️ Warning: If the phone overheats after assembly, chances are you forgot to fasten the metal plate over the processor (it removes heat.

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After successful assembly, let the phone run for 2-3 hours as normal. If everything is stable, the analysis was successful!

FAQ: Frequent questions about the Xiaomi Mi 9