Disconnect the bottom left ribbon cable. Hook your fingernails behind the right and left notches of the black connector part, and pull it towards the brown ribbon cable with even and L/R balanced force until loose. FRAGILE ! The cable will slide out easily.
For reassembly : notice this cable is UNDER the black connector wedge. Put the cable back in place, and push the black wedge back in, again balancing force left and rigt.