Xiaomi Poco X3 NFC - Replacing the screen

Use our checklist to test the basic functions of your Xiaomi Poco X3 NFC before repairing. This way you can check afterwards if your repair was successful.

1. Press and hold the power button until the Power Off menu appears on the screen.
2. Tap Power off in the displayed menu. Your smartphone will shut down within a few seconds.

The edge of the back cover is heavily glued. It is therefore essential to first heat it up sufficiently. Use a hot air device for this purpose, such as a heat gun or an ordinary hair dryer.

1. Heat the edge of the back cover by running the hot air device evenly over it.

To create a narrow gap between back cover and display unit you need a flat, stable tool. We recommend the iFlex for this, since it has particularly sharp edges that can be easily inserted.

1. Attach a suction cup to the lower edge of the back cover and pull it upwards. Insert the iFlex between the display unit and the back cover at the same time.

The back cover is glued separately around the camera module. Be especially careful when removing the back cover at this point to avoid damaging the camera module with your tool.

To avoid damaging the edge of the case with the sharp edges of the iFlex, you should switch to a plastic tool like the iPlastix as soon as possible.

1. Drive the tool completely around the edge of the back cover to loosen it piece by piece.
2. Slide flat picks under the back cover at regular intervals, so that the glue cannot bond again.

1. Once the back cover is completely detached, you first have to remove all plastic picks.
2. Then unfold it and put it aside.

• 11 × 3.9 mm Phillips

Use a screw storage to keep an overview during the repair and avoid losing anything. Use an old sewing box, for example. With our high-quality magnetic pad, you have the additional advantage that nothing slips.

1. Loosen the eleven Phillips screws from the plastic cover above the motherboard.
2. Then put them on your magnetic pad.

The camera module is embedded in the plastic cover. To avoid detaching it accidentally, you should hold it in place with your finger when removing the cover.

1. Carefully lever the plastic cover upwards, so that the lugs that hook it into the screen unit are released. We use a plastic spudger for this.
2. Take the detached plastic cover out of the device and put it aside.

• Connector

Always detach the battery connector as soon as possible to avoid a potential short circuit.

When separating connectors, always start from the side where there are no small components on the motherboard. This way you avoid potential damage.

1. Carefully pry the battery connector from the motherboard with a plastic spudger.

• Connector

Now also separate the connector of the orange fingerprint sensor, which is located right next to the battery connector on the motherboard.

• 7 × 3.9 mm Phillips

1. Remove the sieben Phillips screws from the speaker module.
2. Then place them on the magnetic pad.

1. Carefully lever the detached speaker out of the screen unit with a spudger.
2. Then take it out of the device and put it aside.

• Connector

1. Separate the two connectors of the connecting cable from the USB and motherboard each.

1. Take the separated connecting cable out of your device and put it aside.

The battery is fixed in the screen unit with a continuous thin adhesive film, on the underside of which are the actual adhesive surfaces. The three tabs of the adhesive film rest on the upper side of the battery.

1. First, remove the three adhesive tabs from the top of the battery. The labeling of the tabs indicates the order.

If an adhesive tab tears, simply pull the opposite white tab. Otherwise, you can also use a battery spudger to carefully lever the battery out of its guide.

1. Release the battery by gently pulling the adhesive tab with the A imprint and lift it out of its guide.

When replacing the screen, the white adhesive film of the battery has to be transferred to the new screen in order to attach the battery again. If you take the opportunity and also replace the battery, you do not need to transfer the adhesive film. On the back of the replacement battery, an adhesive film is already integrated.

To remove the battery's adhesive film from the display unit without leaving any residue and to avoid damaging the adhesive surfaces on the film's underside, you should first heat it with hot air.

1. Heat the adhesive film by running a hot air device evenly over it.
2. Then use a sturdy, flat tool, such as a steel spatula, to drive underneath the adhesive film to remove it piece by piece from the bottom of the screen unit.

• Connector

1. Carefully lever the connectors of the camera module off the board.

1. Remove the detached camera module from the device and put it aside.

• Connector

1. Carefully lever the connector of the front camera off the board.

1. Take the separated front camera out of the device and put it aside.

• Connector

The remaining connectors attached to the motherboard are the one of the display and the antenna cable.

1. Separate the two remaining connectors from the motherboard.

• 1 × 2.9 mm Phillips

1. Loosen the single Phillips screw from the motherboard.
2. Place it on a field of the magnetic pad.

1. Press a thin, pointed object into the small round opening in the SIM tray to push it out of the device frame. We use a SIM tool for this purpose.
2. Then pull the tray completely out of the frame.

1. Carefully lever the motherboard out of its guide with a spudger and take it out of the device.

1. Carefully pull the antenna cable out of its guide in the case frame with the help of tweezers.

1. Carefully lever the USB board including the attached antenna cable out of its guide.
2. Take the detached board out of the device and put it aside.

The vibration motor is slightly stuck. To make it easier to loosen, you can first briefly heat it with hot air.

1. Remove the vibration motor from the screen unit by carefully detaching it with a pair of tweezers.

The fingerprint scanner also serves as the power button of your Xiaomi Poco. It is held in place by two covers in the case's edge: A rubber cover and a plastic key resistor.

A small lug helps you pull out the rubber cover.

If possible, only lever on the short sides of the key resistor to avoid accidentally damaging the fingerprint sensor and its flex cable.

1. First, carefully pull the rubber cover out of the guide with tweezers.
2. Then, carefully lever the key resistor out of its guide with tweezers as well.

Be especially careful when removing the fingerprint scanner's button to avoid damaging the sensor as well as the integrated flex cable.

1. Use tweezers to carefully push the button out of its guide in the case's edge.

The flex cable of the fingerprint scanner can easily be damaged. Therefore, be especially careful when detaching the cable!

1. Use tweezers to carefully detach the sensor's flex cable from the edge of the guide.
2. Pull the loosened flex cable together with the button completely out of the guide and put it aside.

The replacement screen of the Xiaomi Poco X3 NFC is not pre-installed. Therefore, you have to transfer all components, including the fingerprint scanner, to the new screen.

1. Remove all protective films and seals from the inside of the replacement screen before you start reinstalling the removed components.
2. You can leave the protective film on the screen glass until the end of the repair for protection.

Be especially careful when inserting the flex cable to avoid damaging it.

1. Use tweezers to thread the flex cable of the fingerprint scanner back into its guide at the edge of the case.

1. Use tweezers to carefully push the fingerprint scanner's button back into its guide at the edge of the case.

The guide's shape in the case edge helps you align the two covers.

Be especially careful when inserting the key resistor in order not to damage the sensor and the flex cable.

1. Use tweezers to carefully press the flex cable of the fingerprint scanner against the inner edge of the guide.
2. Now place the key resistor in the guide and carefully press it down with the tweezers, so that it is firmly seated.
3. Then put the rubber cover back on and also press it carefully with the tweezers to make it sit evenly in the guide.

1. Put the vibration motor back in its original position and press it lightly.

To ensure that the USB board sits evenly, the USB socket must be pushed correctly into its guide in the case frame. To do so, it is best to position the board at a slight angle.

1. Put the board back in its original position in the screen unit.

1. Use tweezers to carefully push the antenna cable back into its guide at the edge of the case.

To avoid damaging any flex cables when inserting the motherboard, you should slightly lift up the cables.

1. Reinsert the board in the screen unit.

1. Reinsert the SIM tray at this point.

• 1 × 2.9 mm Phillips

When screwing components into place, make sure that you do not mix up the screws. A too long screw in the wrong place could damage the screen in the worst case.

1. Fasten the motherboard with the single Phillips screw.

• Connector

Never attach connectors by force. Damage can lead to the failure of an entire component.

1. Reattach the connectors of the screen and antenna cables to the motherboard by carefully pressing them down. You should hear and feel them click into place.

1. Put the front camera back into its guide.

• Connector

1. Attach the connector of the front camera to the motherboard by pressing it gently. You should hear and feel it click into place.

1. Put the camera module back on the motherboard.

• Connector

1. Reattach the camera's connectors to the motherboard.

1. Align the white adhesive film of the battery with the adhesive surfaces facing down.
2. Then press it onto the bottom of the screen unit.

1. Position the battery on the adhesive film.
2. Tape the adhesive tabs back onto the top of the battery.

The label on the connecting cable will help you to align it.

1. Position the connecting cable in the device again.
2. Attach its two connectors to the main and USB board respectively by gently pressing them down. You should hear and feel them click into place.

There are small lugs on the edge of the speaker module. These must fit into the screen unit to ensure that the speaker sits level.

1. Put the speaker back in its original position.

• 7 × 3.9 mm Phillips

Make sure the speaker sits level in the device before you screw it in.

1. Screw the speaker into place with the seven Phillips screws.

• Connector

1. Reconnect the fingerprint sensor by carefully pressing it onto the motherboard. You should hear and feel it click into place.

• Connector

Always connect the battery connector last to avoid a potential short circuit.

1. You can now also reattach the orange battery connector to the motherboard.

There are a few lugs on the edge of the plastic cover. In order for the cover to sit evenly, all lugs have to fit into the casing's edge. For this, it is best to place the cover on the upper edge of the display unit.

1. Reinstall the plastic cover over the motherboard.

• 11 × 3.9 mm Phillips

Make sure the plastic cover sits level in the device before you screw it in.

1. Screw the plastic cover tight with the eleven Phillips screws.

If something doesn't work properly during testing, switch your device off again and double-check if everything is installed and attached correctly.

1. Turn your Poco X3 NFC back on.
   
2. Drag an app over the screen to see if the touch works properly everywhere.
3. Also, check the function of the fingerprint scanner.
4. To test other components, you can use our checklist as a guide.

Attaching a new adhesive frame is optional. If it is still in good condition, you do not need to install a new one. However, if it has defects or no longer sticks properly, we recommend that you install a new adhesive frame.

If the old adhesive frame forms lumps in some places, you should remove them, so that the back cover lies flat again and seals your smartphone properly.

1. We show you how to apply a new adhesive frame in detail in our YouTube video on the example of the iphone 12.

We recommend that you run hot air over the edge of the back cover again, so that the glue bonds properly. You can also weigh down your device with books for a few minutes or clamp it like in our example.

1. Close your Xiaomi Poco X3 NFC after the repair by pressing the back cover back onto the screen unit.