Place the plastic opening tool under the logic board.

Using one hand to stabilize the device, use the tool to lift the logic board away from the plastic case. If the board doesn't come up easily, try not to force it as the board may break. Instead, apply even pressure to lift it away gently from the casing. You will need to gently lift at 2-3 locations around the board.

During reassembly, gently push on 2-4 locations with your fingers until the board clicks into place.