How to disassemble Xiaomi Redmi Note 9T: a step-by-step guide with photos and tips

Xiaomi Redmi Note 9T is a popular smartphone with a balance of price and performance, but even it is not immune to breakdowns. Does the screen react to touch? Is the battery swollen? The speaker stopped working? In most cases, repair requires disassembling the device. However, do not rush to carry the phone to the service center: with the patience and the right tools, you can disassemble the Redmi Note 9T yourself.

This article will help you avoid the typical novice mistakes, from broken latches to damaged display plumes, and we will take a closer look at each step, from the workplace to the motherboard, and give you tips on how to minimize risks.

If you’ve never taken a smartphone apart before, start by watching video instructions (easily found on the Redmi Note 9T teardown) but remember that even experienced craftsmen sometimes face surprises – for example, this model has screws under the lid are different lengths, and confusing them when assembled means risking damage to the board.

Preparation for disassembly: tools and security measures

Before you take on the screwdriver, make sure you have everything you need. The absence of at least one tool can lead to irreparable consequences - for example, trying to fit the lid with a knife instead of a mediator is almost guaranteed to leave scratches on the body.

Here is the minimum set you will need:

• 🔧 Set of screwdrivers (cross-haul) PH00, flat 1.5 mm, five-pointed Y00 screw-cover)
• 📱 Plastic mediators or guitar mediators (to separate the cover and body)
• 🔥 Hair dryer or thermo-air station (for softening glue)
• 🧲 Magnetic mat or screw container (so as not to lose small details)
• 🔋 Suction cup (helps to lift the lid after heating)
• 🛠️ Tweezers (for working with plumes and small connectors)

Also, prepare the workspace: it should be well lit, draft-free (glue cools faster in the cold) and with enough space for laying out parts. Put white paper or a napkin on the table, which is easier to notice the screws that have fallen.

⚠️ Please note: if your Redmi Note 9T If you've been in water or been hit hard, you can be more dangerous than normal, and if you're corrosive, you can have cracks in the case, you can have a short circuit.

Step 1: Turn off and remove the back cover

The first and most important step is to separate the back cover, and it's glued around the perimeter, and if you act rudely, you can damage both the cover and the internal components (like antenna contacts).

1. Turn off the phone and remove it. SIM-card from the tray (if installed).
2. Heat the edges of the cover with a hair dryer (a temperature of ~60 ° C) for 2-3 minutes. Keep the hair dryer at a distance of 5-7 cm so as not to overheat the plastic.
3. Put the lid on any angle (usually starting at the bottom, where the connectors are located). If the lid doesn't lend itself, warm up the area again.
4. Carefully swipe the mediator around the perimeter, separating the glue. Don't try to tear the lid off sharply, so you risk tearing the fingerprint scanner plume.

On the Redmi Note 9T, the lid is not only glued, but also plastic latches along the top and bottom edges. If you feel resistance, check if all latches are snapped, sometimes by swaying the lid from side to side.

Check that the phone is off and the battery will not go up.

Prepare a hair dryer and mediators

Heat the edges of the cover evenly

Start at the bottom corner (near the USB-C connector)

Do not make excessive efforts-->

Once you remove the lid, you'll see the battery, the motherboard and some plumes, and you'll take your time to unplug them, and you'll need to unscrew the screws that hold the metal protection first.

Step 2: Turn off the battery and plumes

Before you touch any components, be sure to turn off the battery. Even when it's off, there's still a voltage on the board, and accidental circuiting can damage it. On the Redmi Note 9T, the battery connector is located at the bottom of the board and is closed with black insulation tape.

Shutdown algorithm:

1. Remove the insulating tape from the battery connector (you can tweez with tweezers).
2. Carefully dent the connector with a plastic tool (metal can close contacts).
3. Disconnect the display plumes, fingerprint scanner and camera (they are fixed with latches that need to be lifted).

Pay attention to the colors of the plumes, which will help you not confuse them when you build them back, for example, the plume of the display is usually wide and white, and the plume of the fingerprint scanner is thin and black.

⚠️ Attention: If you notice that the battery is blown (the lid is raised, the body is deformed), do not try to pierce or bend it. Bloated batteries are prone to spontaneous combustion. In this case, it is better to immediately replace the battery with a new one, before wearing protective gloves.

Step 3: Removing the motherboard

The Redmi Note 9T motherboard is attached to the middle frame with 12 screws of varying lengths, and this is one of the most insidious things about disassembly: if you confuse the screws when you build them, they can damage the board or the screen, and we recommend taking a picture of the location of each screw before you unscrew them.

Procedure:

1. Unscrew all screws (use a magnetic screwdriver to keep them from falling out).
2. Carefully raise the charge with a plastic spatula. Start with the side opposite the connectors.
3. Disconnect the remaining plumes (vibromotor, speaker, antenna cables).
4. Completely remove the board and put it on an antistatic surface (for example, on the package from the package).

The Redmi Note 9T board has several vulnerable elements:

• 📶 Antenna contacts on the edges - easily bend with careless handling.
• 🔌 Charging connector (USB-C) — often breaks off with excessive effort.
• 🎤 Microphone module – small and fragile, located next to the speaker.

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If the screws don't twist, don't force them, check if the screwdriver is the right size. Xiaomi models often use vandalism-proof screws (like a five-pointed slime), and a regular cross screwdriver just licks them.

Step 4: Dismantling the battery

The battery in the Redmi Note 9T is glued to the body with double-sided tape, and removing it is one of the most time-consuming tasks, and if the battery is not bloated, you can try to separate it with a plastic blade and isopropyl alcohol (it dissolves glue).

Instructions:

1. Put the battery on any edge with a plastic spatula.
2. Drop a few drops of alcohol under the battery (do not overdo it - the liquid should not get on the board).
3. Carefully drive the blade under the battery, separating it from the body. If the resistance is too strong, add alcohol.
4. After extraction, clean the body of glue residues with a napkin soaked in alcohol.

If the battery is swollen, don't try to let it down, it's dangerous! Bloating indicates that the cell is malfunctioning and needs to be disposed of. Service centers use special bags for hazardous waste.

Step 5: Disassemble the screen and camera

If you need to replace your display or your camera, you have to go further, and the Redmi Note 9T is glued to the frame, and the camera is attached to a separate module, and here's how to dismantle them:

For the screen:

1. Heat the edges of the display with a hairdryer (temperature ~50°C).
2. You can put the mediator on either side of the screen, and be careful, the plume is very fragile.
3. Disconnect the plume from the fee (if it is not already removed).
4. Completely separate the screen from the frame by removing the glue residue.

For the camera:

1. Unscrew the screws that hold the camera's metal protection.
2. Disconnect the main and front modules.
3. Carefully remove the camera without touching the lenses (greaty prints degrade the quality of the photo).

When changing the camera, note the module markings. The Redmi Note 9T may have different camera versions (e.g., OV48B or S5KGM1), and not all of them are interchangeable.

Phone Assembly: Reverse Order and Typical Errors

Putting the Redmi Note 9T back together is often harder than disassembling, and the rule is, go backwards, but with the nuances in mind.

• 🔄 The screws must go into the same holes that were twisted from, and if you confuse them, you risk damaging the board or the screen.
• 🔋 The battery must be clean and dry before it is connected.
• 📶 The plumes should be tightly fixed with the latches. If the display plume is not fully inserted, the screen may not work.
• 🔊 Speaker and microphone, check for dust. Clogged holes make sound worse.

Typical errors in assembly:

• ❌ Installation of the fingerprint scanner incorrectly – if the plume is bent, the sensor will not work.
• ❌ Tightened screws – this can lead to cracks on the board or case.
• ❌ Dust hitting the screen - because of this, white spots appear when turned on.

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Before you finish building, turn on the phone with only the battery and display connected, and if the screen lights up, the main components are working correctly.

Frequent Questions (FAQ)