the northern screws are covered by isolator tape. Gently peel off (do not tear it - you will need it) until the screw is exposed. South screws may be covered by the black glue, don't worry about it. Just unscrew the screws - the glue will give slightly.

unscrewed matrix (4 screws) slightly lift it by the northern edge. Pay attention to the signal tapes connected to the motherboard