Yes -- that metal piece secured down with two screws. The chip is bonded to it (glued using thermal adhesive.) The ribbon is attached to the IC. (I think the ribbon and chip is attached to the heatsink as a whole.) The ribbon is also bonded between the two layers of glass in the panel, making it unreplacable if it fails -- this is by necessity due to the high connection density. Clamping down the screws ensures the IC receives proper heatsinking and prevents failure. Some panels have thermal pads on the other side. Failure of said IC leads to vertical lines, black bars, etc. The ICs operate at around 60V, with 384 channels each -- the semiconductor design for that is not trivial in one bit and they do run quite hot.
@xpto56 the ribbon is one of those metal clamps along the top or bottom X board, WITH POWER OFF disconnect the ribbon and reseat it then turn it on to test. Each ribbon drives the appropriate portion of the display panel (PDP.)