I followed Suzanne’s comment and also did not disconnect this cable (vertical sync ribbon cable) to avoid damage. I pivoted the screen about 110 degrees after the other cables where detached. On a flat surface, this is easily done and the cable is not tight. Image of my angle if I can drop a link. and cable in this position not in tension.
English translation of bluesoundsmusic comment: “Caution! This plug can be very tight, here a good fingernail helps to lever the plug alternately right and left”