The third, and final, cable you will need to unplug is the TMDS connector. This is located under a rectangular strip of black tape that has a gray and black cord coming out of one end.
Peel back the black tape, starting at the end with the cords protruding out.
Under the black tape, you will see the gray and black cords going into a connection that looks like it is wrapped in aluminum foil. Grasp that connection and pull carefully in the downward direction toward the bottom of the display.