The process of dismantling modern smartphones requires high accuracy and understanding of the internal architecture of the device. Xiaomi Redmi Note 12 is no exception, as the manufacturer technology hidden screws and adhesives to improve moisture protection and aesthetics. Before starting any manipulations, you need to clearly understand the risks associated with leakage of the case.
Incorrectly performed procedures can damage plumes or even damage the motherboard. In this article, we will look at each stage of dismantling in detail to minimize the likelihood of errors. Preparation of the workplace and the availability of a specialized tool are the foundations of successful repairs.
Any work with electronics begins with preparation, and dismantling Xiaomi Redmi Note 12 requires special attention to detail.
You need to provide good lighting and a clean surface so that small screws do not get lost in the carpet pile.
Ignoring this stage often causes loss of fasteners or mechanical damage to the housing.
Necessary security tools and measures
A high-quality disassembly of a smartphone is not enough just a screwdriver, you will need a whole arsenal of specialized equipment, the main tool will be a set of precision screwdrivers, including cross bits PH00 and PH000, as well as flat slits for tweaking plumes.
The heating device is critical, because the display module is mounted on double-sided tape around the perimeter, and using a hair dryer or heat pad will soften the adhesive without overheating the internal components.
- 🔧 A set of precision screwdrivers with magnetic bits
- 🔥 Thermostol or building dryer with temperature control
- 💳 Plastic cards or mediators for opening the body
- 🔫 Suction cup for display lift
⚠️ Before starting work, be sure to turn off the smartphone and wait for it to completely turn off to avoid short circuits when accidentally touching contacts.
Special attention should be paid to protection against static electricity, which is harmful to chips, it is recommended to use an antistatic bracelet or periodically touch a grounded metal object.
Also, prepare the screw sorting containers, because the design uses different lengths of fasteners, and if you mix them up when you build them, you can damage the thread or you can break through the body.
Primary dismantling and removal of the back cover
The first step will be to remove the tray for SIM-Use a paper clip or needle by pressing the tray on the bottom end of the device into the hole.
After removing the tray, carefully examine the bottom of the smartphone, where you will find two screws that lock the back panel.
Heating the back cover is the most important moment of the initial stage of disassembly.
Evenly warm the perimeter of the body to a temperature of about 80-90 degrees Celsius, holding the tool no more than 3-4 seconds in one place.
Excessive heating can cause the battery to bloat or damage the adhesive base of the display on the back.
Temperature regime
After warming up, install a suction cup at the bottom of the back cover and pull up slightly, creating a gap.
In the resulting gap, carefully insert a plastic card or mediator and lead the tool along the perimeter, cutting the adhesive layer.
Move smoothly, without jerking, so as not to damage the fingerprint scanner plume, which is often attached to the inside of the cover.
Removal of the protective plate and disconnection of plumes
Once you successfully remove the back cover, you will see a metal frame that covers the main components, and this plate is fixed by many screws around the perimeter and in the center.
You'll need to unscrew all the visible screws, including those that can be hidden under stickers or rubber plugs. Beware: some screws may be of different lengths, and it's important to remember or unfold them in the order of removal.
☑️ Removal of the protective plate
When all the fasteners are removed, carefully lift the metal protection, trying not to touch the plumes passing under it.
Use a plastic blade to snap the battery connector off the motherboard, a critical step to prevent short circuits when working with other components.
- 🔋 Disconnect the battery connector first.
- 📱 Turn off the main display plume
- 📷 Remove the connectors of the camera plumes
- 🎚️ Turn off the button and speaker plume
Now you can take off the protective plate itself and have full access to the insides of the smartphone, and at this point you can see the main board, the charging connector and the battery.
Visually inspect the plumes for any cracks or oxidation that may have occurred before, and any defects require replacement of the corresponding modules.
Replacement of the battery and work with the battery
In the Redmi Note 12, the battery is located at the bottom of the body and is attached to powerful adhesive strips. Retrieval will require reheating the bottom of the device.
Use of metal objects for tampering with the battery is strictly prohibited, since a puncture of the lithium-polymer element will lead to its ignition or explosion.
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Use special hood tongues (pull-tabs), if they are preserved, or carefully enter the plastic card under the battery after warming up, making sawing movements.
After removing the old battery, clean the seat of glue residue with an alcohol solution or a special cleaner. Apply a new double-sided tape for a new battery to securely lock.
Connect the new battery to the motherboard and check the smartphone's response to the connection. The device should vibrate or show a charge indication when connected to the network.
⚠️ Warning: Never attempt to bend or deform the battery when installed, this can damage the internal structure and cause a fire.
The process of replacing the battery requires patience, especially when removing old glue.Take your time to avoid damaging adjacent components such as the charging port plume.
Make sure the battery connector sits tightly in the connector, but don’t overdo it with effort to avoid breaking the fragile contacts on the board.
Dismantling of the display module and cameras
If your goal is to replace a broken screen, then once the protective plate is removed and the plumes are turned off, the display module in this model is glued to the frame.
To remove the module, you need to warm up the front of the smartphone. Be extremely careful with the temperature so as not to damage the device. OLED-matrix that is sensitive to overheating.
Use a suction cup and mediators to separate the display from the frame.
Move around the perimeter, gradually increasing the gap.
After removing the module, access to a subscreen fingerprint scanner and plumes will open.
| Component | Type of attachment | Difficulty withdrawal |
|---|---|---|
| Back cover. | Glue + 2 screws | Medium |
| Protective plate. | Lots of screws. | Low. |
| Battery | Strong glue | Tall. |
| Display. | Perimeter glue | Tall. |
The main camera in the Xiaomi Redmi Note 12 is located in the upper left corner and is often closed with an additional protective frame.
The camera module can be glued to the body, so it is recommended to warm up the area around the lens slightly before extraction. Pull the camera strictly vertically upwards, avoiding distortions.
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When replacing the display, always check the operability of the touchscreen and matrix before final assembly and gluing of the new module.
Assembly of the device and verification of functionality
The assembly is done in reverse disassembly order, but with the mandatory replacement of adhesive elements. Old adhesive does not ensure tightness, so the use of new moisture-protective frames or B-7000 glue is mandatory.
Apply the glue thinly on the frame of the case and let it dry slightly (about 1-2 minutes) before joining the parts.
Install all components in their places, making sure that the plumes are laid in special slots and not clamped.
Twirl all screws, observing the order and effort, so as not to break the thread in the plastic bushings.
Connect the battery and check the operation of all smartphone functions before the final fixation of the lid.
- ✅ Checking the speaker and microphone
- ✅ Testing of communication modules and Wi-Fi
- ✅ Checking camera and flash
- ✅ Touchscreen test across the entire area
The final step is to install the back cover, warm up the edges and press it tightly against the body, locking it with rubber harnesses or a load for 15-20 minutes.
Do not turn on the device immediately after assembly, let the glue gain final strength within a few hours to restore moisture protection.