Disassembly/Repair of the mobile device vivo Y31 with each step description and the required set of tools.

⚠️️ Before disassembling, do not forget to turn your phone off.

Use the ejection tool (aka Needle) or Paperclip. Push the tip all the way into the hole until the tray ejects, and then pull the tray of SIM and Memory card (Micro SD) out.

⚠️️ Pay attention! The tool must be inserted into a hole on the edge of the phone's housing. Do not press too hard. It may break the tray eject mechanism.

We recommend using a special heating device such as a separator machine, heat gun, or heating mat. It will simplify the process. You can use a home hairdryer, but you will have to make a nozzle by hand or have a suitable one in the kit to gently heat and concentrate the heat flow in the right place.

ℹ️️ The surface of the back cover must be heated to soften the adhesive underneath. The approximate heating temperature is 50° C / 125° F.

Use a thin plastic film or pick for separation. To facilitate the process, you can use isopropyl alcohol. It is often the most difficult to pass the tool between the parts to be divided. Choose the far edge from the FFC cables or buttons.

Do not use a lever or any force for separation that could damage the elements inside.

Using a screwdriver (Phillips 1.5 mm PH000), unscrew one short screw.

Using a screwdriver (Phillips 1.5 mm PH000), unscrew two screws and remove the bracket securing the cables and fingerprint sensor connector.

Using a screwdriver (Phillips 1.5 mm PH000), unscrew 15 screws.

If the screws are different:

ℹ️️ Be sure to note the location of the screws before disassembling. When assembling the device, screwing the screw in the wrong place may damage the device or its parts. To avoid damage, the removed screws and individual pieces (as gaskets or brackets) must be laid out in the appropriate order, or the screws and their holes in the phone must be marked with colored markers.

Pry up the fingerprint sensor connector.

Pry up the edges. Move an opening tool along the edge, detach the clips and remove the middle cover.

Peel the black sticky film back.

Pry up the edges. Remove the cover with a flashlight. The cover protects the printed circuit board (PCB).

Try to lift the cover by the edges and don't push anything too far inside, so as not to accidentally break or short-circuit anything on the circuit board.

Disconnect the battery connector as soon as possible. It is better to use a non-metal or plastic tool to avoid any damage.

ℹ️️ The vivo Y31 model has a battery B-O8 with 5000 mAh capacity (aka rechargeable battery).

⚠️️ It is highly recommended to disconnect the connector to avoid possible short circuits during disassembly.

Peel back the black protective film hiding one screw securing the cover.

Using a screwdriver (Phillips 1.5 mm PH000), unscrew one screw.

Carefully remove the cover with the loudspeaker. To do it we have to unstick the protective film too.

Disconnect the cable to the mainboard, on the sub-board.

Detach the sub-board and carefully turn it over. Please check the direction on the Picture 2.

It may be glued to the frame with metalized tape, so to facilitate the process, the sub-board can be heated a bit. The sub-board, also, may be attached with attachments like latches or hooks.

After, we still have the coaxial cable from inside to disconnect, so the turning and disconnecting parts of this process must be done as much carefully as possible.

ℹ️️ The sub-board contains the charging port (Micro-USB), microphone, spring contacts for the speaker, vibration motor, and an antenna unit.

⚠️️ It is not necessary to insert the tool underneath when removing the sub-board. Internal components could be damaged.

Pry up the connectors of power / volume buttons cable, display module cable, inter-board cable, and coaxial cable.

⚠️️ Be careful when removing the cables from the connectors, the cables are pretty thin, and it is easy enough to break them or damage the contact tracks inside.

Pry up the connectors and remove three rear cameras and one front (selfie) camera.

The front camera is covered with protective film.

The film glues to the camera and to the shield on the motherboard.

To remove the camera we should peel the film off the shield.

Using a screwdriver (Phillips (Barrel) 2.5 mm for hollow screws), unscrew one screw.

Carefully remove the printed circuit board. There is no need to use a lever or try to reach the circuit board by force. Make sure that nothing is getting in the way or holding the circuit board.

The motherboard, also, may be attached with attachments like latches or hooks, so be careful.

⚠️️ Do not bend the circuit board when removing it or push tools under it. Unbeknownst to yourself, you can damage components or cables from the inside.

ℹ️️ In the display frame remained: the earpiece speaker, battery, coaxial cable and vibration motor.