It may be the connections, or the wiring as well. Not to add to the list of variables, but it would be difficult to determine where the problem is on this particular configuration.
What would need to happen would be for the switchbox to seamlessly allow one signal while allowing nothing from the second signal. Perhaps a higher quality box may do the trick, but you might try different cables. Since it's an older set, 1.3 or lower would probably be recommended for this situation.
My son sets up entertainment centers in homes as a living, he could not solve my problem and told me to go online to see if anyone has had same problem.
I have a samsung LDP 50" TV 2005 model HLP5063W, when my son tried to install a Monster switching box between a cable H.D. box and Blu- Ray DVD to the Tv, it showed an Error HDCP-019, not compatible.
He could, using a HDMI cable attach both of these boxes directly to the TV and they worked great. either the TV or two different switch boxes is the problem, he's not sure.Looking for an answer from one of experts on the forum.