Smartphone Redmi Note 12 from Xiaomi has become one of the most popular budget devices of 2023 thanks to its balanced characteristics, stylish design and affordable price. However, like any gadget, it is not immune to breakdowns: a broken screen, a swollen battery or a broken speaker can damage the phone. In such cases, disassembly necessary, but it is important to do it correctly so as not to damage fragile components.
This article will help you understand all the intricacies of the process - from preparing tools to reassembling. We will consider step by step instructions with photos, typical mistakes of beginners, and also give advice on replacing key modules. We will pay special attention hidden latches under the battery and SIM card tray, which often break if opened carelessly. If you've never disassembled smartphones before, start by learning the structure Redmi Note 12 - this will save time and nerves.
Preparing for Disassembly: Tools and Safety Precautions
Before you begin, make sure you have everything you need. Without the right tools, you risk damaging the case or internal components. Here minimum setwhich you will need:
- 🔧 Plastic picks (2-3 pcs.) - for carefully lifting the lid.
- 🔩 Phillips screwdriver (PH00 or PH0) - for rear panel screws.
- 🧲 Magnetic mat or a container - so as not to lose small parts.
- 🔥 Hair dryer or hot air station — to soften the glue (if the screen is glued).
- 📱 Sucker - will help remove the display module.
Also prepare your workplace: it should be well lit, without dust and static electricity. Use antistatic wrist strap, if you are working with the motherboard, this will protect it from damage. Don't forget that Redmi Note 12 has IP53-certification, but this does not mean that it is protected from dust during disassembly!
⚠️ Attention: If the phone has been in water or been subjected to strong impacts, disassembling it can be dangerous! Condensation inside the housing or deformed components may cause a short circuit. In such cases, it is better to contact the service.
- Yes, many times
- Tried it 1-2 times
- No, but I want to learn
- No and I don't plan to
Removing the back cover: hidden latches and glue
The first step is to remove the back panel. B Redmi Note 12 it is attached to glue and plastic latches, so you need to proceed with caution. Start by heating the edge of the case with a hairdryer (temperature ~60°C) for 1-2 minutes. This will soften the glue and make the process easier.
Insert a plastic pick into the gap between the cover and the frame (it’s better to start from the bottom corner where the connector is located USB-C). Carefully move the tool along the perimeter, releasing the latches one by one. Don't use force - if the lid does not budge, warm it up again. Pay special attention to the area around the camera: there are additional latches there.
Heat the edges with a hairdryer|Use only plastic tools|Start from the bottom corner|Do not press on the middle of the lid (the battery is there!)|Mark the location of the latches on the photo-->
After removing the cover, you will see the internal structure: battery, motherboard and cables. Do not rush to disconnect them - first take a photograph of the location of all the elements. This will help with reassembly.
What to do if the latch is broken?
If the plastic latch breaks off, don't panic. It can be replaced with a similar one from the donor body or fixed with superglue (just don’t overdo it!). In extreme cases, the lid will be held on by glue, but this is a temporary solution.
Battery disconnection: why is it critical?
Before any manipulation of the insides Redmi Note 12 be sure to disconnect the battery. This will prevent short circuit and damage to the motherboard. The battery in this model is secured with adhesive tape with a tab - pull it to release the battery.
If the tab breaks (which happens often), use a plastic pick to gently pry the battery from the side. Do not pierce it with metal objects - this may cause a fire! After removal, inspect the battery for swelling. If it is deformed, replacement must be carried out with gloves and in the open air.
| Sign | What to do | Consequences of ignoring |
|---|---|---|
| The battery is swollen | Immediate replacement | Hull rupture, fire |
| The adhesive tape is torn | Use a pick | Battery damage from sharp objects |
| Battery contacts are oxidized | Clean with alcohol | Poor contact, rapid discharge |
⚠️ Attention: If a battery is punctured or leaking electrolyte, immediately place it in an airtight container with sand or salt. Do not throw it in regular trash - it is dangerous for the environment!
Screen replacement: nuances of the display module
Screen Redmi Note 12 - one of the most vulnerable places. It is glued to the frame and will require patience to replace. First, disconnect all the cables leading to the motherboard (usually 2-3 of them: the main display, touchscreen and backlight). Use tweezers or a plastic spatula to carefully pry up the connectors.
The new screen should be fully compatible with the model Redmi Note 12 (check the article!). When installing, make sure that the cables are not twisted or pinched. After connecting, test the display for functionality before final assembly - this will save time if something goes wrong.
Before gluing the new screen, clean the frame of any old adhesive with isopropyl alcohol. This will provide better fixation and prevent peeling.
If after replacement the screen flickers or does not respond to touches, check:
- 🔌 Correct connection of the cables (they should sit tightly, without backlash).
- 📱 Compatibility of the new module (sometimes cheap analogues do not support all functions).
- 🔧 Integrity of contacts on the motherboard (oxidation or contamination).
Disassembling the motherboard: what can be damaged
Motherboard Redmi Note 12 Compact, but it contains many small elements. To remove it, first unplug:
- Battery (already done in the previous step).
- Cables for camera, speaker and buttons.
- Antenna wires (these are attached to the top of the board).
- Screws securing the board (usually 6-8 of them, of different sizes!).
Avoid touching the board when working with it. microcircuits And capacitors - Static electricity can damage them. If you need to replace e.g. charging connector or microphone, use a soldering station with a thin tip and flux. For beginners, we recommend practicing on non-working boards.
Not all motherboard components Redmi Note 12 can be replaced at home. For example, repairing a processor or memory requires professional equipment and micro-soldering skills.
Reassembling: how not to forget anything important
Assembly is often more difficult than disassembly. To make sure you don't miss anything, follow reverse order actions and check each step:
- Make sure all cables are connected tightly.
- Check if there are any foreign objects (screws, pieces of plastic) left inside the case.
- Close the lid, starting from the top (there are fewer latches there).
- Warm up the edges with a hairdryer before finally fixing the glue.
After assembly, turn on the phone and test all functions: camera, speakers, sensors, charging. If something does not work, disassemble the device again and check the problem unit. Often the reason is poorly connected cable or a forgotten screw that presses on the board.
⚠️ Attention: If your phone doesn't turn on after assembly, don't panic. Check that the battery is connected and that the contacts on the board are not shorted. Sometimes it helps to hold the power button for 20-30 seconds to reset the charge on the capacitors.
FAQ: answers to frequently asked questions
Is it possible to disassemble Redmi Note 12 without a hairdryer?
Theoretically, yes, but this significantly increases the risk of damaging the cover or cables. Glue on Redmi Note 12 Quite durable, and without heating the latches may break. If you don't have a hairdryer, try using hot water in a bag (apply to the lid for 5 minutes), but this is less reliable.
How much does it cost to replace a screen at a service?
The cost depends on the type of display. An original module will cost 5,000–8,000 rubles, and a non-original (Chinese equivalent) will cost from 2,500 to 4,000 rubles. The service will charge another 1,000–2,000 rubles for the work. Replacing it yourself will be cheaper, but requires care.
What should I do if the camera does not work after disassembling?
Most likely the problem is in the cable or connector. Disassemble the phone again and check:
- Is the camera cable connected to the motherboard?
- Are there any dirt on the contacts (wipe with alcohol).
- Is the cable itself damaged (sometimes it frays due to careless assembly).
If the cable is intact, but the camera does not work, the board itself may be damaged - only diagnostics at the service center will help here.
How to check whether the original battery is installed?
Original battery Redmi Note 12 has:
- Logo Xiaomi or Redmi on the body.
- Clearly marking the container (e.g.
5000mAh 3.85V). - Factory packaging with a hologram (if purchased separately).
Counterfeits are often lighter in weight and have blurry printing. Also, the original holds a charge longer and does not get hot when charging.
Is it possible to wash Redmi Note 12 after disassembly?
No! Even if you clean the board from dust, use only dry brush or compressed air. Water, alcohol, or other liquids can damage components if they are not completely dry. To clean contacts it is permissible to use 90% isopropyl alcohol, but only in minimal quantities and followed by drying for at least 24 hours.