Step-by-step dismantling of Xiaomi Redmi 9T: from the lid to the motherboard

Xiaomi Redmi 9T is one of the most popular budget smartphones, but even it is not immune to breakdowns. The screen does not respond to touch, the battery is swollen, or the speaker began to wheez? In most cases, repairs are cheaper if you disassemble the device yourself. However, improper disassembly can lead to damage to the plumes, the failure of screws or even short circuit.

In this guide, we will explain in detail how to disassemble Redmi. 9T (model M2010J19SG), You'll learn what tools you'll need, how to disconnect the battery properly, and where the most vulnerable elements are located. 9T, including versions NFC (M2010J19SC) without him.

If you've never disassembled a smartphone, you should practice on an old device or go to a service center. 80% of self-disassembly damage is due to misuse of a mediator or screwdriver.

Preparation: security tools and measures

Before you start disassembling, make sure you have everything you need, and the absence of even one tool can cause permanent damage to the body or internal components.

• ✅ Plastic mediator (or guitar mediator) – to separate the back cover.
• ✅ The screwdriver. PH00 (magnetic - for Redmi screws 9T.
• ✅ Suction (optional) - helps to suction the cover if the glue is too strong.
• ✅ Tweezers - for careful disconnection of plumes.
• ✅ Isopropyl alcohol (90%+) — Cleaning contacts and removing glue residues.
• ✅ Heat pad or hair dryer - if the glue is not amenable (heat not above 60)°C!).
• ✅ Antistatic bracelet (recommended) – to protect against static electricity.

Also, prepare the workspace: it should be well lit, free of dust and foreign objects, and spread the screws in order of their extraction (you can use a magnetic substrate or a piece of paper with the designated areas).

⚠️ Warning: Do not use metal tools to separate the lid! Even a small scratch on an aluminum frame can become a hotbed of corrosion.

Step 1: Removing the back cover

Redmi back cover 9T It's glued around the perimeter, so it's hard to separate it without heating it. SIM-- The cards are off the tray:

1. Heat the edges of the body with a hair dryer (temperature not higher than 60 ° C) for 1-2 minutes. This will soften the glue.
2. Insert the mediator into the gap between the lid and the frame (start with the lower left corner where the tray notch is located). SIM-map).
3. Carefully drive the mediator around the perimeter, separating the lid, and if you feel resistance, warm up the area again.

Don't put too much effort into it! If the lid doesn't lend itself, check if there are any undetached areas, and most of the time, the problems are in the area of the camera and the charging connector.

Make sure the phone is turned off|Extract SIM-memory-card|Warm up the edges of the body with a hairdryer|Prepare the mediator and the sucker.-->

⚠️ Warning: If there is any trace of moisture or corrosion under the lid, stop disassembling immediately! this may indicate damage to the motherboard - in this case, professional diagnosis is required.

Step 2: Battery disconnection

When you take the lid off, you'll see the battery glued to the body, and the first thing you need to do is disconnect the plume to avoid short circuits.

1. Find the battery connector (located at the top of the board, next to the camera).
2. Carefully tuck the black plastic fixture with tweezers and disconnect the plume.
3. Check with a multimeter that there is no voltage on the contacts of the battery (optional, but recommended).

If the battery is swelling, don't try to puncture it or bend it! Bloated batteries are extremely dangerous - they can ignite or explode, in which case it is better to trust the replacement to specialists.

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If the adhesive under the battery is too strong, moisten it with isopropyl alcohol and wait 5-10 minutes. This will help to gently separate the battery without damage.

Step 3: Removing the motherboard

The Redmi 9T motherboard is mounted on 10-12 screws (depending on the modification). Before you unscrew them, take a picture of the location of each screw - they can vary in length!

After the screws are removed:

1. Disconnect all the plumes: display, touch screen, cameras, speaker and power/volume buttons.
2. Carefully tuck the board with a plastic spatula, starting at the top edge.
3. Make sure that no plume is stretched - otherwise you can tear off the contacts.

The most vulnerable elements are located on the board:

• 🔌 The charger connector (often detached when sloppy extraction).
• 📶 Antenna contacts (fragile and delicate).
• 🔊 Microphone and speaker (can be glued to board).

Step 4: Disassembly of the display module

The Redmi 9T has three parts: sensor glass, LCD panel, and frame. If you just need to replace the glass, you can do without disassembling it completely, but if you damage the matrix, you have to change the entire module.

For display compartment:

1. Heat the edge of the screen with a hairdryer (temperature 50–60°C).
2. Insert the mediator in the gap between the frame and the display.
3. Carefully drive the mediator around the perimeter, separating the duct tape.

⚠️ Warning: If the display cracks, put Scotch tape on it to prevent the fragments from crumbled!

After the display is separated, you will see:

• 📱 Touch screen plume (thin, easily torn).
• 🖥️ The matrix plume (wider, but also fragile).
• 🔋 Flexible light cable (often glued).

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If you're replacing a display module, be sure to transfer a metal frame and adhesive tape from the old one to the new screen. Without them, the new display won't fit tightly.

Step 5: Replace the speaker, camera, and other components

If the purpose of the disassembly is to replace the speaker, the camera or the charging connector, you don't have to remove the motherboard.

• 🎤 The microphone and speaker are attached to 2-3 screws and a plume, often glued to the body.
• 📸 Main camera - disconnect the plume and unscrew the module mount screws.
• 🔌 The charging connector is the most capricious element. When you replace it, check the integrity of the contacts on the board.

When you change your camera, look for a dust pad, which you have to move to a new module or replace with a similar one, and without it, the camera will quickly become contaminated.

Common Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when disassembling the Redmi 9T. Here are the most common of them and ways to prevent them:

• ❌ Break the screws, use a good screwdriver and don't put too much effort into it.
• ❌ Damage to plumes - never pull on plumes! Always poke them by the plastic fixture.
• ❌ Overheating during soldering - if you have to solder, use a soldering station with temperature adjustment (max. 300)°C).
• ❌ Loss of screws – spread them out in order of extraction or use a magnetic mat.
• ❌ Ignoring antistatics – even a small discharge can damage chips on the board.

If the phone does not turn on after assembly, check:

1. Is the battery connected correctly?
2. Have you forgotten to plug in the display plume or buttons?
3. Is there a short circuit on the board (checked by a multimeter).

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If the phone turns on after disassembly, but the sensor or display is not working, most likely the plumes are not connected tightly. Try reconnecting them, after cleaning the contacts with alcohol.

FAQ: Frequent questions about the Redmi 9T disassembly