Modern smartphones, including the popular Xiaomi Redmi 9, are designed to ensure maximum tightness and protection of internal components. However, there comes a time when the user needs to access the hardware: a broken display, a battery failure or a charging plume replacement. Self-opening of the device is a risky, but often the only cost-effective procedure to bring the gadget back to life without going to the service center.
The Redmi 9 disassembly process requires not only precision, but also a specific set of tools, since the device body is assembled without the use of screws on the front panel. The back cover here is plastic, but is held on a powerful adhesive layer, and the screen frame often requires heating for safe separation. Before starting work, it is important to understand that any interference with the design will void the warranty if it is still valid.
In this guide, we will take a detailed look at each step of dismantling, from the preparation of the workplace to the shutdown of the plumes, you will learn how to properly heat the case, which screwdrivers to use and how not to damage the fragile components of the motherboard.
Workplace preparation and necessary tool
Before you start to physically affect the Redmi 9 body, you need to organize a safe space. The work surface should be clean, well-lit and preferably not conduct static electricity. Using an antistatic mat or a conventional wooden board will significantly reduce the risk of electronics being disabled by accidental discharge.
You need a specialized set of tools to disassemble properly. You don't need to rely on universal supermarket kits, as their metal is often too soft or fragile. Xiaomi micro-screws require precision magnetic-tipped screwdrivers.
- 🔥 Dryer or thermoplatform - to soften the glue under the screen and back cover.
- 🔧 Set of screwdrivers (cross-crosses) PH00, PH000 and flat) - for twisting screws of different sizes.
- 🎴 Plastic blades and mediators - for safe snapping clips without scratches.
- 🧲 Magnetic mat or organizer - for sorting screws, so as not to confuse them when assembling.
Pay special attention to the suction cup. It must be of high quality to create a vacuum the first time. A weak suction cup will make you put extra effort, which can lead to cracks in the glass or deformation of the frame. Also at hand should be isopropyl alcohol or a special solvent of glue (B-7000) to facilitate the process of separation of elements.
⚠️ Warning: Never start disassembling if the battery charge is above 25% Damage to the lithium-ion battery with a sharp tool can cause instant fire or chemical burn.
Primary dismantling: Removal of the back cover and SIM tray
The process of opening the Xiaomi Redmi 9 begins with removing external elements that may interfere with access to the screws.The first step should always be to remove the tray for the propellers. SIM-This is critical, because trying to open the case with the tray installed is guaranteed to break the mechanism or damage the motherboard.
☑️ Pre-mortem checks
Once the tray is removed, you need to turn off the device. Even if the phone is software-enabled, it is recommended to wait a minute before work begins. The Redmi 9 back cover is made of polycarbonate and glued around the perimeter. It will require heating to remove it. Use a hair dryer by warming the edges of the rear panel for 2-3 minutes. The temperature should not exceed 80-90 degrees so as not to melt the plastic.
Once the body is warm to the touch, apply a suction cup to the bottom of the back cover and pull up slightly, creating a gap. Insert a plastic mediator into the resulting gap. Do not use metal blades at this stage - there is a high risk of damage to the fingerprint scanner plume or antenna conductors, which often pass under the lid.
Move the mediator along the perimeter, gradually snapping the clips. The movements should be sliding, parallel to the plane of the smartphone. After passing all sides, the lid should easily separate. If you feel strong resistance, stop pulling and warm up the problem area again.
Disconnection of the battery and removal of the protective plate
When you remove the back cover, you'll see an interior space dominated by a battery and a protective plastic bar covering the plumes. On Redmi 9, this bar is attached with multiple screws of different sizes. It's critical to remember the location of each screw, because a longer screw screw screw screw screw screw screwed into a short hole can pierce the motherboard right through.
The first step after removing the protection is to turn off the battery, which is the golden rule of mobile repair: Find the battery connector (usually a wide plume at the bottom or middle of the board) and gently tuck it into a plastic blade, and shutting down the power will prevent short circuits from accidentally touching other components with the tool.
| Component | Location. | Type of attachment | Risk of damage |
|---|---|---|---|
| Battery | The bottom part | Glue + connector | Tall (fire) |
| Screen plume | Upper part | Protective plate. | Middle (cliff) |
| Vibromotor | Lower end | Screws + plume | Low. |
| Maternity fee | Upper part | Screws + plumes | critical |
Only after the battery is turned off can you start disassembling further. If you plan to change the screen, you now need to remove all the screws that hold the metal frame or additional plastic linings that cover the display plumes. In the Redmi 9 model, you often find a layout where the plumes of the display and touchscreen are closed by a common metal plate in the upper third of the body.
What do I do if the screw is ripped off?
Dismantling of display and touch screen
Removing the display module is the most delicate step. The Redmi 9 screen is attached to a double-sided tape around the perimeter and possibly on the glue in the center. To separate, you need to use heating again. Grease the front panel moderately, constantly checking the temperature with your hand so that the matrix does not overheat, which from high temperature can leak or go in colored stripes.
Use a thin line or a special string knife if the glue is too strong. Swipe the tool between the frame and the glass, making sawing movements. Plastic blades here are less effective, because they can crush the edges of the matrix. Act slowly, without jerking.
- 🔍 Visually inspect the plumes - they can be glued to the frame.
- 🌡️ Do not overheat the top of the screen where the plume is located.
- 👐 Raise the display evenly from different sides.
When the module is separated from the case, don't pull it sharply.The plumes are still plugged into the board (unless you've disabled them earlier, which is the last thing to do before taking them off completely).Gently bend the display like a page of a book to access the connectors.Click the display and touchscreen plumes using a plastic shoulder blade.
⚠️ Warning: The display plumes are very thin and have a multilayered structure. Even a microscopic tear or a hall can lead to stripes on the screen or a complete absence of the image.
Replacement of the battery and work with adhesive base
If the purpose of the autopsy was to replace the battery, after removing the screen or protective plates, you will have access to the battery. In Redmi 9, the battery can be glued quite strongly. Do not try to tamper with a metal tool from the bottom or side - a puncture of the battery housing will cause it to ignite.
Use a suction cup and warm-up of the back of the case (if the lid is already removed, you need to warm up through a metal screen or carefully around the perimeter) to safely extract the suction cup, and it is also effective to use a thin plastic card that is soaked in isopropyl alcohol. Enter the card under the battery and make sawing movements, gradually cutting off the adhesive layer.
When installing a new battery, make sure to apply a new layer of glue. You can use special adhesive tapes (B-7000 or similar strips) to ensure that the battery is fixed and prevents it from bloating or displacing when falling.
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Residues of old glue from the frame are best removed with a soft cloth soaked in isopropyl alcohol. Do not use acetone, as it can melt the plastic frame of the case.
Device assembly and initial inspection
The Xiaomi Redmi 9 is built in reverse order, but requires even more care. First, plug in the battery and check if the device is turning on without fully collecting it, which will avoid re-disassembly if you forgot to plug in a plume or made an error.
Make sure all connectors are standing up to the characteristic click. The plumes should be flat, free of clamps and tension. Once the torque, sound and vibration are successfully turned on and checked, you can start fixing the components. Stick the screen, install the protective plates and twist all the screws.
The back cover also needs to be placed on a new glue. Apply a thin layer of glue around the perimeter, press the lid and lock the device with rubber bands for 15-20 minutes before the initial grip. Don't turn the phone on immediately, give the glue time to polymerize.
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The main mistake in assembly is to forget to put the vibrator motor or antenna wire in the groove. Always make sure that all flat plumes and wires are in their channels before closing the case.