Modern Xiaomi, Redmi and Poco smartphones are famous for their performance, but over time, any device may require maintenance. Self-disassembly of a gadget is not only a way to save on services of a service center, but also an opportunity to better understand the device.
In this guide, we will take a detailed look at the steps of opening the case, turning off the plumes and dismantling key components, you will learn about the intricacies of working with adhesive adhesive adhesive and the risks that can be faced with inept handling of thin electronics.
Disassembly of models from different series can be significantly different: budget Redmi often have removable rear panels, while the flagship Mi and Xiaomi are usually sealed. We will focus on the most common scenario - the dismantling of the device with a glued body, as it causes the most questions from users. Proper preparation of the workplace is already half the success of the entire operation.
Tools and workplace preparation required
Before you start dismantling, you need to have a comfortable space, the surface of the table should be clean, well-lit and not conduct electricity to eliminate the risk of static discharge, Ideal antistatic mat, but in extreme cases you can use a clean sheet of dense paper.
For quality work, you will need a specialized set of tools that can be purchased in electronics stores or ordered online. The use of improvised tools such as kitchen knives or pins is strongly discouraged, as they can easily damage internal components or scratch the case.
- 🔧 Precision screwdriver kit (cross-hatch) PH000, PH00 and flat) for screw twisting.
- 🔥 A hair dryer or heating platform to soften the adhesive layer under the screen and cover.
- 🎴 Plastic cards, mediators or special blades for snapping latches.
- 🧲 Magnetic mat or organizer for sorting screws of different sizes.
- 🧴 Isopropyl alcohol or special solvent of glue (B-7000) surface-cleaner.
Pay special attention to heating. The temperature should not exceed 80-90 degrees Celsius, so as not to damage OLED-overheating can cause yellow spots on the display or deformation of the frame. 2 before 5 minutes, depending on the thickness of the glass and the type of glue.
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Use the suction cup together with the mediator: heat the edge, attach the suction cup, slightly pull and insert the plastic spatula into the resulting gap.
Removal of the back cover and primary access
The first step is always to remove the tray. SIM-This action not only frees up access to the insides, but also prevents accidental damage to the tray when heated or pressurized. In some Xiaomi models, the screws can hide under the tray or decorative stickers.
Once the perimeter is heated, you need to carefully insert a thin plastic blade into the junction between the frame and the back cover. Move the tool along the perimeter, trying not to dive deeper than 3-4 mm, so as not to touch the plumes or components located at the edges. The characteristic crackling of the adhesive is normal.
⚠️ Warning: Don't force the back cover if it doesn't lend itself.This is a sure sign that the glue isn't warm enough and you risk breaking the glass or damaging the fingerprint scanner plume if it's embedded in the button or cover.
Once the lid is removed from the frame, don't make any sudden movements. Often, a fingerprint scanner plume or flash LED is glued to the inside of the glass. Carefully inspect the insides and, if you have connections, carefully disable the connectors using a plastic blade or nail. Metal tools can't be used here.
Next comes the spinning of screws that fix the plastic frame (the middle part) that holds the motherboard. The number of screws can range from 8 to 15. Some of them can be hidden under stickers or rubber plugs, so carefully examine the surface.
☑️ Checking before removing the framework
Dismantling the battery and motherboard
Once you remove the middle plastic bezels, you'll have access to the main nodes, and the first thing you need to do is disconnect the battery plume from the motherboard, which is a critical step that shuts down the device and prevents short circuits from further manipulation.
The battery in modern Xiaomi smartphones is usually glued to double-sided tape. To extract it, you can use a special hood with suction cups or carefully tuck the battery with a plastic card, starting from the opposite edge of the plume. In no case pierce the battery body and do not bend it.
- 🔋 Disconnect the main battery plume with the connector up.
- 🧩 Remove protective plastic linings from the display and touchscreen connectors.
- 🔌 Carefully click the display plumes, moving parallel to the plane of the board.
- 📱 Remove the vibrator if it interferes with access to the board (often located at the bottom).
The motherboard can be attached to the screws or held on the guides. Before removing, make sure that all antenna cables (usually black with round connectors) that go from the board to the top and bottom of the case are disabled.
Nuances of work with antenna cables
When you remove the board, keep it by the edges, avoiding touching gold contacts and chips with your fingers. Fat marks from your fingers can oxidize over time and cause contact disruption. If you change the charging connector, which is often soldered on a separate board, it is dismantled in a similar way.
Screen and touchscreen replacement
Replacing the display module is one of the most common causes of disassembly. In most modern Redmi and Xiaomi models, the screen is glued directly to the frame. To replace, you need to completely unstick the broken module, heating the perimeter, and transfer all the small parts (speaker, mesh, plumes) to the new frame.
The glue re-adhesive process requires patience. Old glue is removed with alcohol and a plastic blade. New frames often come with a layer of glue already applied, a protective film closed, and you need to remove the film immediately before installing a new screen to avoid dust.
| Type of damage | What to change | Difficulty | Need some glue. |
|---|---|---|---|
| Only glass (image available) | Touchscreen glass | High (needs separator) | Yes (LOCA) |
| Black spots, stripes | Display module | Medium | Yes (B-7000) |
| The touch doesn't work. | Module assembled | Medium | Yes (B-7000) |
| Glass and matrix broken. | Module assembled | Medium | Yes (B-7000) |
When you install a new module, first plug in the plumes and check the phone's performance without sticking it permanently, make sure the sensor, the image and the sound are working, and only after a successful test can you apply the glue and fix the module in the frame.
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Purchase of a module assembled with a frame greatly simplifies repair, since there is no need to re-adhesive and clean the old case of glue residues.
Cleaning the speaker and microphone from dirt
A common problem with users is the quiet sound of a conversational speaker or wheezing, and often it's not the breakdown, but the banal contamination of the grid with dust and earwax, and disassembly allows you to get to the dynamic emitter and clean it without damaging the membrane.
To clean, use a soft toothbrush or brush. You can slightly moisten the pile with isopropyl alcohol, but it is important not to pour the speaker with liquid. The movements should be sweeping, from center to edge. After cleaning, let the alcohol completely evaporate before assembly.
- 🧹 Carefully walk with a dry brush on the speaker grid.
- 💧 In case of severe pollution, use a minimum amount of alcohol.
- 🌬 Blow the holes with a pear for dust (not with your mouth so that moisture does not get into the hole).
- 🔍 Check the condition of the sealing rubber bands around the dynamic module.
A similar procedure is performed for the bottom microphone, which is often clogged with pile from pockets. If the problem does not disappear after cleaning, you may need to replace the sound module itself, which is usually attached to screws or latches.
⚠️ Warning: Do not use sharp objects (needles, pins) to pick the speaker grid. You can pierce the protective membrane, after which the speaker will start wheezing or stop working altogether, and also lose moisture protection.
Assembly of the device and checking leakage
The final stage is assembly. It's done in reverse order. Make sure that all the screws are back in place: long screws can't be screwed into short holes, it can break through the tracks on the board. Watch the puffing moment so that you don't break the thread in the plastic racks.
To fix the back cover or screen, use a special electronics glue, such as the B-7000 or T-7000. Apply a thin strip of glue around the perimeter, press the parts and fix them with stationery gums for 15-20 minutes before the initial grip. Remove the excess glue immediately until it freezes.
Once assembled, be sure to check all the features of the device: camera operation, Wi-Fi, Bluetooth, charging and sensor. If you've changed the screen or battery, it can take a while to calibrate the sensor. Turn on the phone and let it work for 10-15 minutes.
What to do if the phone is not turned on?
Complete tightness, as in the factory, at home is not achieved, but a high-quality sticker of the lid will protect against dust and splashes. Regularly check the condition of the edges of the screen and cover for detachments.