To remove the back cover, gently pry open the edge of the case with a small flat edged tool, beginning from a top corner, working your way towards the bottom in both directions.

Remove the 6 silver screws.

Remove the 11 black screws.

Pop up the ribbon cable that connects the screen to the board.

Gently lift out the board. The screen remains with the case. The top right (looking at the photo) corner of the board can be difficult to lift out. Lifting by the black plastic tab (where you've taken out two silver screws) may help.

Replace the clearly broken screen with a good one. The screen is glued on the frame slightly. You may break it if you don"t lift it around its sides slowly. You may use something thin (such as your finger nail) for that.