Xiaomi’s Redmi Note series has earned a reputation for being reliable, with great autonomy, but over time, any battery loses its capacity. If your Redmi Note 9S starts to run out quickly, stops turning on or gets mechanically damaged, the only way out is to replace the components on its own. Disassembly of this gadget requires care, since modern models are tightly assembled, and adhesive connections make it difficult to access the insides.
Before you start dismantling, make sure you have the right tool and workplace. The wrong sequence of actions can damage the plumes or break the glass back cover. In this article, we will take a detailed look at the process of opening the case, disabling the plumes and removing the main modules so that you can carry out the repair without unnecessary risks.
It's worth noting that self-interference in the design of the device will void the official warranty if it's still valid. However, if the phone is no longer warranty-worthy, a competent approach will extend its life for several years. We'll take a look at all the nuances that beginners often miss, including working with heating equipment and thin connectors.
Preparation of the workplace and the necessary tool
The electronics disassembly starts well before the first screw is unscrewed, and you need to have a well-lit space where the small details are not lost or swept away by drafts, and an antistatic table is ideal, but a clean, cloth-covered wooden surface is also suitable.
To work with the Xiaomi Redmi Note 9S, you will need a specific set of tools that are not always in a standard home first aid kit. The main element will be a heating device, since the back panel is fixed to a powerful layer of glue. Without first warming up, trying to open the case will lead to cracks in the glass.
- 🔥 Hair dryer or heating pad for pre-softening of the adhesive layer.
- 🪛 Set of screwdrivers (cross-crosses) P2, P5 flat).
- 🎴 Plastic mediators and suction cup for neat opening.
- 🧲 Magnetic mat or organizer for screws of different sizes.
Pay special attention to the condition of the battery before work. If the battery is swelling, you can not heat the device - this can provoke ignition. In such cases, disassembly is carried out with the utmost care, trying to minimize the mechanical pressure on the bloated battery.
Removal of the back cover and primary access
The first step in the disassembly procedure is to turn off the power, and since it is impossible to remove the battery from the closed case of the Redmi Note 9S, it is necessary to completely discharge the device before turning off, a critical safety step that prevents short circuits from disconnecting the plumes.
When you turn off the phone, you need to warm up around the perimeter. Use a hair dryer by setting the temperature around the perimeter. 80-90 and warm the sides evenly during the 2-3 Do not keep the hot air flow in one place for a long time so as not to damage the air. OLED-matrix or adhesive layer of the display on the back.
⚠️ Warning: Do not attempt to lid with a knife or metal spatula immediately after heating.The glass is still fragile at this point, and a sharp jerk is guaranteed to cause chipping or complete destruction of the rear panel.
When the body is sufficiently warmed, place a suction cup at the bottom of the back cover, just above the Redmi logo. Pull the suction cup up, creating a gap, and simultaneously inject a plastic mediator into the slot. Carefully guide the tool along the faces, cutting through the softened glue.
💡
If you don't have a professional heating pad, you can use a tightly closed hot water bag, put your phone down for 5-7 minutes, which is a gentler method of heating.
Once the perimeter is passed, the lid should be easy to remove. If you feel resistance, don't use force, you better warm up the problem area again, inside you will see a plastic panel covering the main part of the components, and the main camera module.
Dismantling the protective panel and disconnecting the plumes
And underneath the back, there's a long plastic plate that protects the motherboard and the battery from dust and mechanical stress, and it's mounted with a lot of screws of different calibers, so it's important to keep the screws spinning and remembering the location.
Use a magnetic-tipped screwdriver to extract the fasteners. The screws can be hidden under stickers or rubber plugs that need to be carefully removed. Once all the fasteners are removed, the panel is removed by moving upwards.
Now you have access to the main connectors, and the first thing you need to do is to disconnect the main battery plume from the motherboard, and then use a plastic blade to gently lift the connector up, and you should avoid using metal tools to keep the insulation from breaking through.
| Component | Type of attachment | Features of withdrawal |
|---|---|---|
| Battery | plume connector | Strictly from below, do not press on the fee |
| Display. | plume connector | Located next to the battery, requires care |
| Camera module | plume connector | Fragile, easily damaged with a sharp jerk |
| Charging charges | plume connector | It goes through the whole body, requires careful extraction. |
Once the power is out, you can unplug the other plumes, the display, the cameras, the antennas and the buttons, and notice the antenna wires, which are often glued to the body, and you have to unplug them slowly, starting with the thickened part of the connector.
☑️ Check before charge is withdrawn
Removal of the battery and replacement of components
In the Redmi Note 9S, the battery takes up a significant portion of the internal volume and is glued to the frame with double tape. You can't just pull it out with your fingers, you need to use force and chemistry. Before you start extracting, make sure that all the plumes on top of the battery are free.
To facilitate the task, it is recommended to use a special liquid to dissolve the glue (for example, B-7000 Or isopropyl alcohol, which you have to inject under the edges of the battery through the gaps. 5-10 minutes to get the chemistry deep.
Use plastic cards or special suction cups to pull out the battery. It is strictly forbidden to use sharp metal objects, since a puncture of the lithium polymer cell will cause instant fire or caustic smoke. Pull evenly, without distortion.
⚠️ Warning: If the battery is too swelling, don't press it. Any deformation may damage the integrity of the inner layers. Remove it with the edges and place it in a safe place immediately.
The new battery is installed on a fresh layer of double-sided tape. Be sure to degrease the surface of the frame before sticking to keep the new cell secure. Once installed, plug the plume in and check the reaction of the device without collecting it completely.
How to dispose of an old battery?
Removal of the display module and work with the frame
If your goal is to replace a broken screen, the process is complicated by the fact that in the Xiaomi Redmi Note 9S, the display is glued to the frame, not just inserted into it. Quality repairs often require repainting new glass to the original frame or replacing the module assembled.
To remove the frame with the display, you need to twist all the screws around the perimeter and disconnect the plume that goes to the bottom control board. Be careful with the fingerprint scanner plume, if it is integrated into the side button - it is easy to damage.
Heating the front panel requires even more care than heating the back cover. The temperature should not exceed 70-80 degrees, so as not to damage the matrix and not deform the plastic elements of the frame. Use a suction cup and mediators to separate the glass from the body.
When you install the new module, make sure that all sealing gums are in place, they protect the insides from dust and moisture. After assembly, check the touchscreen and display the image before the final gluing of the case.
💡
Replacing the display assembled with a frame is a more expensive, but much simpler and more reliable way of repair than gluing the glass separately.
Assembly of the device and verification of functionality
And you do it in reverse sequence, but with a lot of care, and you first put the battery in and stick it in, then you plug it in, and then you can put the rest of the components in and you can screw the plastic panel.
Make sure all screws are tightly twisted, but without fanaticism, so as not to disrupt the thread in the plastic seats. Pay special attention to the plume of the main speaker and antennas - they should lie in their channels and not be clamped.
Before you stick the back cover, be sure to turn on your phone and check all the features: sound, vibration, camera performance, Wi-Fi, Bluetooth and touch screen. If you forget to check something now, you will have to disassemble the device again.
- 📱 Check the sensor across the entire screen area.
- 🔊 Test the volume of the speaker and microphone.
- 📸 Take a few pictures on all the cameras.
- 🔋 Make sure the phone sees charging and displays percentage correctly.
The final step is to apply a new adhesive layer to the body frame. Use a special adhesive sealant B-7000 or a ready-made adhesive circuit. Apply the composition with a thin layer, let it dry a little (2-3 minutes), then tightly press the back cover and lock the device with rubber bands for 1-2 hours.
⚠️ Warning: Do not turn the phone on immediately after assembly if you used liquid glue. Let it be completely polymerized, otherwise the adhesive vapors may settle on the cameras or board, causing clouding of the optics.