The motherboard is clipped with the back of the display panel.

Start working with the top right of the phone. Remove the motherboard from the clip by hand or use a Jimmy to leverage in little force to make it easier.

Use tweezers to lift the motherboard up. This may require a little force since this part of the board has little clips underneath.

Continue working with the motherboard all the way around till the bottom half of the phone. Straightforward!