Xiaomi Redmi Note 9S is a popular smartphone with a balance of price and performance, but even it is not immune to breakdowns. Screen not responding to touches? Is the battery swollen? Or just want to clean your device from dust? In most cases, repairs are cheaper if you do them yourself. However, disassembly Redmi Note 9S requires caution: there are fragile cables inside, the adhesive base of the battery and the risk of damage to the hydrophobic gaskets.

These instructions will help you disassemble your phone without errors - from removing the back cover to removing the motherboard. We described each stage in detail, indicated critical moments, where parts most often break, and gave advice on choosing tools. If you have never disassembled smartphones, start with preparation: read the article to the end to understand whether you can do it yourself or whether it is better to contact a service.

Preparation: Tools and Safety Precautions

Before disassembly Redmi Note 9S make sure you have everything you need. Without the right tools you risk damaging the case, cables, or even the motherboard. Here is the minimum set:

  • 🔧 Plastic picks (2–3 pcs.) - for removing the cover without scratches.
  • 🔨 Phillips screwdriver (PH00 or PH0) - for housing screws.
  • 🧲 Magnetic mat or a container - so as not to lose small parts.
  • 🔥 Hair dryer or hot air station - to soften the battery glue.
  • 🧴 Isopropyl alcohol (90%+) — for cleaning contacts and removing glue residues.
  • 📱 Sucker (optional) - helps to lift the lid after heating.

If you plan to replace the battery or screen, purchase adhesive tape for fixation (For example, 3M 9448A) and hydrophobic gaskets - They are easily damaged during disassembly. Also prepare your work area: the table should be clean, free of debris, and the lighting should be bright.

⚠️ Attention: Don't take it apart Redmi Note 9S with power on! Even if the phone does not respond to the power button, disconnect the battery first - this will prevent a short circuit. If the battery is swollen, do not try to puncture it: there is a risk of fire!
📊 Have you disassembled smartphones before?
  • Yes, repeatedly
  • Yes, but for a long time
  • No, this is my first experience
  • I prefer service centers

Step 1: Removing the back cover

Housing Redmi Note 9S It's glued around the perimeter, so you can't just open it. Heat will be required to soften the glue. Use a hair dryer at minimum power (or a hot air station at 60–70°C), heating the edges of the phone evenly for 2–3 minutes. Do not direct hot air at the screen or camera!

After heating:

  1. Place the suction cup 近近 on the bottom edge of the phone (next to the connector USB-C).
  2. Gently pull up and a small gap should appear.
  3. Insert into the slot plastic pick and slowly move it along the body, separating the cover.
  4. Do not use excessive force: if the lid does not budge, heat it again.

Pay special attention to the area around the power and volume buttons - they often remain there. unseparated areas of glue. If the cover is removed but resists, check to see if you have forgotten the screws (there aren't any, but sometimes users confuse them with other models).

Heated all edges evenly|Using a plastic pick, not metal|Didn't put pressure on the screen or camera|Made sure there were no hidden screws-->

Step 2: Disconnecting the Battery

Once the cover is removed, the first thing to do is disconnect the battery. To do this:

  1. Find battery cable — it is located at the top of the phone, under the metal protection.
  2. Gently pry black connector plastic pick or tweezers. Don't pull the wires!
  3. Make sure that the contacts are not shorted - you can check with a multimeter (if you have one).

In Redmi Note 9S, the battery is glued to the body with double-sided tape rather than liquid glue. This simplifies replacement, but requires caution: if it is pulled off abruptly, the cable may break or the NTC sensor (thermistor) may be damaged.

If the battery is swollen, do not try to remove it by force. Better:

  • 🛠️ Heat the case with a hairdryer (but not higher than 80°C).
  • 🧴 Pour isopropyl alcohol under the edge of the battery - it will dissolve the glue.
  • 🪛 Pry off the battery with a plastic spatula, starting from the corner.
⚠️ Attention: If the battery is deformed, do not use metal tools - risk of puncture and fire! As a last resort, wrap the pick in electrical tape.
What to do if the battery cable comes off?

If the cable contacts come off the board, the phone will not turn on even with a new battery. In this case you will need soldering or replacing the motherboard. Do not try to connect the wires by twisting them - this will lead to a short circuit!

Step 3: Removing the Motherboard

Motherboard Redmi Note 9S attached to 12 screws different lengths. Remember the location of each - if you mix it up, you can damage the board or case. We recommend taking a photo of the process or placing the screws in order on a magnetic mat.

Procedure:

  1. Unscrew all screws (use a screwdriver PH00).
  2. Disconnect the cables:
    • 📱 Display (in the center, wide connector).
    • 🔊 Speakers and microphone (thin cables on the right).
    • 📷 Main camera (at the top).
  • Carefully lift the board, starting from the top edge. Do not pull on the connectors!
    • Screw Size Quantity Location
    Black (short) 1.3 mm 4 At the corners of the board
    Silver (medium) 2.0 mm 6 Along the edges
    Gold (long) 2.5 mm 2 Near the charging connector

    If the board cannot be removed, check:

    • 🔌 Are all the cables disconnected (especially the cable touch glass).
    • 🔧 Are there any hidden screws under stickers or cables?
    • 🧲 Is there any magnetic interference (sometimes the board “sticks” to the case).
    💡

    If the screws are rusty or won't come out, apply a drop of water to them. WD-40 or alcohol. Do not use force - stripped threads will complicate assembly!

    Step 4: Disassembling the Display Module

    Screen Redmi Note 9S consists of three parts: touch glass, display (OLED matrix) And frame. If you are only changing the glass, you can do without complete disassembly, but when replacing the matrix you will have to remove everything.

    Algorithm:

    1. Warm up the screen with a hairdryer (60–70°C) for 3–5 minutes.
    2. Use a plastic spatula to pry up the glass, starting from the corner. Use suction cup for convenience.
    3. Disconnect the matrix and sensor cables (they are secured with latches).
    4. Remove the metal frame - it is held in place by latches and glue.

    Important details:

    • 🔥 Do not overheat the screen - the OLED matrix is sensitive to high temperatures.
    • 🧴 To remove glue residues, use isopropyl alcohol, not acetone.
    • 📱 If the sensor does not work after assembly, check the cable for microcracks.
    ⚠️ Attention: B Redmi Note 9S The sensor cable runs under the battery. If you remove the screen with the battery connected, you risk shorting the contacts! Always turn off the power beforehand.

    Common mistakes and how to avoid them

    Even experienced craftsmen sometimes make mistakes when disassembling Redmi Note 9S. Here are the most common:

    • 🔧 Screws mixed up - long screws in short holes damage the board.
    • 🔌 Torn trains — most often the display or camera cable is affected.
    • 🔥 Battery overheating - may cause swelling or fire.
    • 🧲 Loss of hydrophobic pads — without them, the phone will lose protection from moisture.

    To minimize risks:

    • 📸 Take photos of every stage - this will help with reassembly.
    • 🔍 Check cables for bends before connecting.
    • 🧪 Test your phone after every step (for example, after connecting the battery).

    1) Is the battery connected?

    2) Are there any closed contacts on the board?

    3) Are the display and button cables installed correctly?-->

    FAQ: Answers to popular questions

    Is it possible to disassemble Redmi Note 9S without a hair dryer?

    Theoretically, yes, but the risk of damaging the case or cables increases significantly. The adhesive on the cover and battery is very strong, and without heating the plastic may crack. If you don't have a hairdryer, use hot water in a bag (place the phone in a bag of warm water for 5-7 minutes), but make sure that no moisture gets inside!

    What should I do if the camera does not work after disassembling?

    Most likely, the cable has come loose or the contacts have been damaged. Check:

    1. Is the camera cable connected to the motherboard?
    2. Is there any visible damage on it (cracks, creases).
    3. Are the contacts clean (wipe with alcohol if necessary).

    If the cable is intact, but the camera does not work, the matrix itself or the controller on the board may be damaged.

    How to check that hydrophobic pads are not damaged?

    Inspect the white/gray rubber gaskets around the perimeter of the housing. If they:

    • 🔹 Torn - replace with new ones.
    • 🔹 Deformed - align or replace.
    • 🔹 None - the phone will lose standard protection IP53.

    Gaskets can be purchased in a repair kit or cut from silicone tape.

    How much does it cost to disassemble Redmi Note 9S?

    The cost depends on the complexity of the work:

    • 🔧 Battery replacement — 1 000–1 500 ₽.
    • 📱 Screen replacement — 2,500–4,000 ₽ (including parts).
    • 🔊 Cleaning from dust — 800–1 200 ₽.
    • 🛠️ Diagnostics — 500–1 000 ₽.

    Do-it-yourself repairs are cheaper, but without experience you can make the damage worse.

    Is it possible to assemble a phone without the original screws?

    Technically yes, but not recommended. Screws in Redmi Note 9S have different lengths and threads:

    • Short screws (1.3 mm) - for attaching the board to the case.
    • Long screws (2.5 mm) - for fixing metal screens.

    If you use the wrong screws, you may damage the board or screen. As a last resort, select analogues with the same thread and length.