Smartphone Xiaomi Poco X3 NFC has established itself as a reliable device with excellent autonomy, but over time, even the highest quality equipment requires maintenance. Most often users are faced with the need to replace a broken screen, worn-out battery or charging module. Self-disassembly of the gadget saves a significant amount of money that would have to be paid in the service center, but requires extreme care and accuracy.
The process of dismantling components of this machine has its own technical features related to the design of the housing and the location of the plumes. Unlike the more simple models, it uses a multi-layer layout, where the motherboard is closed with additional screens and plastic fixtures. Incorrect handling of fasteners can lead to damage to fragile connectors or leakage.
Before you start to act, you need to prepare the workplace and make sure that you have a specialized tool. Lack of suction cups or heating equipment can turn a simple procedure into a risky venture where there is a high chance of damaging the back cover. It is important to understand that opening the case automatically voids the manufacturer's warranty, so weigh all the risks before starting work.
⚠️ Warning: Before starting any manipulations, be sure to turn off your smartphone and discharge the battery to a level 20-25%. Working with a fully charged battery increases the risk of fire in case of damage to the tool.
Tools and workplace preparation required
The Poco X3 NFC is not capable of being dismantled properly without a suitable set of tools, as the device is assembled in a factory. The main enemy of dismantling is the glue that holds the back cover around the perimeter, so having a heat source is a must. The best way to heat is to use a professional temperature-adjusted dryer or thermost, although in extreme cases you can do with a household hair dryer, with caution.
The second critical tool is a set of precision screwdrivers, because the design uses screws of different sizes and types of heads. Using an inappropriate bit can lead to slicing of the screw faces, which will make them extremely difficult to extract further, you will also need plastic blades (mediators) to snap latches and a thin metal scalpel to work with the adhesive layer.
For ease of operation and safety of small parts it is recommended to use a magnetic mat or organizer with cells, this will not confuse screws of different lengths, which is especially important when assembled, as too long a screw can damage the internal components or penetrate the insulation. Be sure to prepare a suction cup for careful lifting of the back cover after it is heated.
- 🔧 Precision screwdriver set (PH000, PH00) mount.
- 🌡️ A hair dryer or heating plate to soften the adhesive layer under the screen.
- 🧲 Magnetic mat or organizer for sorting screws of different sizes.
- 🎴 Plastic blades and mediators for safe opening of the body without scratches.
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Use isopropyl alcohol to dissolve glue residues - it does not conduct current and quickly evaporates, leaving no traces on the board.
Primary dismantling of the back cover and protective elements
Start disassembling Xiaomi Poco X3 NFC should be carefully heating the perimeter of the rear cover. evenly warm the edges of the device for 2-3 minutes, avoiding overheating the central part where the camera and battery are located. Once the body becomes warm to the touch, attach a suction cup at the bottom of the rear panel and create a small gap, in which you immediately need to insert a thin plastic blade.
Move the blade along the perimeter, gradually freeing the lid from the adhesive layer, but do not try to remove it completely at once. Inside the case, there may be plumes connecting buttons or antennas to the main board, and a sharp jerk will lead to their cliff. Exercise special care in the area of the main camera module, as there the glue can hold tighter, and the risk of damaging the optics is higher.
When you remove the back cover, you'll see a plastic frame that covers the internal components, and it's attached to a lot of screws around the perimeter and in the center. Before you unscrew, you'll have to look at the fastener, and some screws can be hidden under stickers or rubber plugs that can be easily damaged by careless movement.
☑️ Removal of the back cover
If you unscrew all the screws you see, don't rush to remove the frame, because it can be further fixed by the latches. Carefully walk with a plastic card or a spatula around the inner perimeter of the frame to snap all the locks. Only when you make sure there is no resistance, you can remove the plastic lining and get full access to the battery and motherboard.
Disconnecting the battery and dismantling the motherboard
The first step after gaining access to the insides of the device is to turn off the battery, which is a critical safety point, because accidentally closing the contacts on the board on can cause the power controller to fail. The battery plume is located at the bottom of the device and connected to the board through a connector that needs to be tampered with a plastic blade.
The motherboard in the Poco X3 NFC is covered with a metal screen that is also screwed. To access the display connectors and camera plumes, you need to unscrew all the fasteners that hold this screen. Pay attention to the length of the screws, because they can vary in different angles, and they can not be confused during assembly.
When the metal screen is removed, you can access the main plumes, carefully disconnect the display plume, the main and front camera plumes, and the charging connector plume. When working with connectors, avoid using metal tools to avoid damaging the contact areas on the board.
⚠️ Warning: The display plume in this model is very thin and sensitive to clamps. Never bend it at a sharp angle or pull it with force.
Now you can take out the motherboard itself, which is usually held on a few screws and carefully removed by moving up, and be careful about the speaker that can be glued to the board or body, and not damage it when lifting.
Nuances of connector work
Replacement of the display and camera module
Replacing the display with the Xiaomi Poco X3 NFC often requires removing the bezels completely or carefully separating the screen from the body if you change the component assembly. If you use the original module with a frame, the process is simplified: just move all the internal components from the old frame to the new one. In this case, carefully transfer the speaker, vibrator and charging plume, as they are often glued to the old frame.
When working with camera modules, the optically stabilized Main Camera (OIS) is the most sensitive element, and its mechanical damage will cause the image to shake.Removal the cameras by holding on to their body rather than the optical unit or plume.
Before installing a new display, be sure to check its operability by connecting the plumes to the board without final assembly. Turn on the device and make sure that there are no broken pixels, touch screen and proximity sensor operation. Only after successful verification can you apply a new glue and fix the screen completely.
- 📸 Take the main camera last to minimize the risk of dust hitting the matrix.
- 🖥️ When replacing the display, use special adhesive tapes (B-7000 or analogues) for leakage.
- 🔍 Check the condition of sealing rubber bands around the cameras before installing new modules.
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Always check the performance of a new display and cameras before applying the glue and final assembly of the case.
Work with the battery and bottom plume
The battery in the Poco X3 NFC is attached to double-sided tape, and its removal requires caution. Under no circumstances do not try to tamper with the battery with metal tools or compress it strongly, as this can lead to lithium fire. For safe dismantling, it is recommended to use a special hood with suction cups or gently poke the battery with a plastic card, preheating the area under it.
The bottom of the smartphone contains a USB Type-C charging connector and a microphone that often fails. The charging module is connected to the motherboard with a long plume running along the battery. When replacing this component, it is important to properly stack the plume in the designated channels so that it does not clamped down with the case.
When installing a new battery, make sure the contact group is clean and not oxidized. After connecting the battery, do not rush to close the device - measure the voltage at the contacts with a multimeter if possible, or simply monitor the start of charging immediately after turning on.
| Component | Type of attachment | Difficulty replacing | Risk of damage |
|---|---|---|---|
| Back cover. | Perimeter glue | Low. | Medium (cracks) |
| Battery | Double-sided scotch | Medium | High (fire) |
| Display. | Glue + frame | Tall. | High (break) |
| Maternity fee | Screws + plumes | Tall. | Medium (CZ) |
Assembly of the device and verification of functionality
The Poco X3 NFC is assembled in reverse order, but with a few important rules: first, degrease the body surface and the new lid with alcohol to better adhesive. Apply the adhesive in a thin layer, avoiding getting into the internal components, cameras and dynamic heads.
When you install the screws, you need to be center-to-edge, and don't just screw them all the way up. You need to make sure you get all the screws straight, and then you need to tighten them evenly. A twisted screw can break the plastic frame or damage the carvings in the case.
Once you've finished building, turn the device on and run a full test of functionality. Check the entire touch screen, volume and on button response, vibrator operation and charging. Pay special attention to camera operation and autofocus, as a loosely closed module can cause an error.
⚠️ Warning: If after assembly the smartphone does not turn on or warms up in the area of the processor, immediately turn it off.
The sealed device after self-disassembly is not 100% restore, so avoid moisture and dust. Use a high-quality adhesive base for the back cover to provide at least basic protection against splashes and dust in everyday use.