What probably no longer works from 75 inches is the "Easy Cable Access" in the "Service Position" (shown in pictures 2 and 6). This angles the TV to make it easier to reach the slots. The angle is probably too large for 75 inches or, depending on the model, the depth of the TV or the mounting position, is no longer guaranteed. If you can do without the "service position" - e.g. because you have already laid all possible cables before hanging the TV - it should theoretically work, provided the 40 kg are not exceeded.