Disassembly/Repair of the mobile device Lenovo Tab 4 TB-8504X (Lenovo Tab 4 TB-8504X P1) with each step description and the required set of tools.

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

Open the hatch hiding the tray of the SIM and Memory cards (Micro SD), and remove it.

ℹ️️ Remember the location for the SIM and Memory card (Micro SD) trays so that nothing is confused when reassembling.

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

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.

⚠️ Look in advance in the picture for the cables’ location for inter-board, touchscreen, display, buttons (if any) under the cover to not damage them accidentally.

Using a screwdriver (Phillips 1.5 mm PH000), unscrew 16 short screws.

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 part. 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.

Using a screwdriver (Phillips 1.5 mm PH000), unscrew 10 long screws.

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 part. 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.

Remove the cover with antennas that protect the printed circuit board (PCB). Try to lift the covers by the edges and not push anything between them to not accidentally touch or short-circuit anything on the PCB.

Disconnect the battery connector as soon as possible.

ℹ️️ The Lenovo Tab 4 TB-8504X model has a battery L16D1P34 with 4850 mAh capacity (aka rechargeable battery).

⚠️ It is highly recommended to disconnect the connector to avoid possible short circuits during disassembly. Also, try not to use a metal tool to disconnect the rechargeable battery connector or do it carefully.

Pry up the connector and remove the rear camera.

Carefully remove the copper foil tape hiding the front camera.

Pry up the connector and remove the front (selfie) camera.

Disconnect the connector and remove the SIM and Memory cards holder.

Disconnect the coaxial cable connector, inter-board sub-screen 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).

Unsolder loudspeaker and microphone wires

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

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

⚠️ 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.

Carefully remove the loudspeaker with wires.

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