Disassembly/Repair of the mobile device Xiaomi RedMi 3S with each step description and the required set of tools.

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.

Using a spudger or a plastic pick, carefully, around the edge, detach the back cover clips, and turn it over.

Do not insert the tool deeply or bend it. Otherwise, the housing may be tampered with or damaged.

⚠️ Be careful when opening the cover from the volume and power buttons side. Thin cable and fragile buttons are straightforward to damage.

⚠️ Pay attention to the fingerprint sensor cable located on the inside.

Pry up the fingerprint cable connector and remove the back cover.

The back cover.

Using a screwdriver (Phillips 1.5 mm PH #000), unscrew the eight screws.

Pry over the edges. Move an opening tool along the edge detach the clips and remove the cover with antenna pads and tracks.

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

ℹ️ The Xiaomi RedMi 3S model has a battery BM47 with 4000 mAh capacity (aka rechargeable battery).

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

Using a screwdriver (Phillips 1.5 mm PH #000), unscrew the five screws.

Pry over the edge and remove the loudspeaker assembly with antenna tracks.

Using a screwdriver (Philips 1.5 mm PH #000), unscrew one screw securing the sub-board.

Disconnect the coaxial cable connector, inter-board cable connector.

⚠️ Do not pull on the cable or pry it with a sharp tool, the connectors are pretty weak and break easily, or the cable falls out of the end (lug).

With extreme care, remove the battery because it is glued from the inside by the manufacturer.

Also, we need to remember or look in advance at the location of the flat cables under the battery, so as not to damage them.

Using a screwdriver (Phillips 1.5 mm PH #000), unscrew the one screw securing the motherboard.

Disconnect the connector on the motherboard, and remove the main camera.

Pry up the connectors of the side buttons cable, display cable, touchscreen cable, and front camera 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.

Turn over the motherboard, disconnect the connectors of the inter-board cable and coaxial cable from the inside and remove the motherboard.

Pry at the bottom of the body and remove the front (selfie) camera.

Pry at the bottom and remove the earpiece speaker.

⚠️ Be careful! The earpiece speaker is glued a bit with adhesive.

⚠️ If we pry the speaker in the middle we may break the earpiece speaker in half.

ℹ️ In the display frame remained: the coaxial cable, inter-board cable, vibration motor.