I'm hoping someone can shed some light on an unusual HDMI problem. I've had the HDMI input fail on my Samsung LN46C750; the set is 6 months old and was set up with my Denon AVR HDMI output feeding the Samsung HDMI 1 input. All was well for months until I powered up the set one day and received a "no signal" message. I tested by connecting my components (the AVR, Dishnetwork RXer, and Roku) directly to the Samsung HDMI inputs and still received the "no signal" message for all three connections. I tried a factory reset on the Samsung, then tested all three components again with three different cables, same results. I ultimately opened a service request with Samsung and had the main board in the set replaced. I fired everything up while the service person was here with my AVR connected to the Samsung HDMI 1 input and all was well. The next day, I received the "no signal" message again.
I haven't contacted Samsung yet; I don't mind having another service call for a main board replacement, but it seems odd that two would fail.
I tested again by connecting three different components directly to the Samsung with three different cables. When a device is connected to, say, HDMI input 2, then that input will appear in the source list like it's a valid source, but when selected does not work and I receive the "no signal" message. When no cable is connected to a particular HDMI port, that source is "greyed out", and a "check cable" message is displayed.
Can anyone offer any insight into what's happening? Am I really just unlucky and have another bad main board or is there some weird HDCP/handshake thing going on with my AVR and other components? One more thing to mention is that I had the same AVR and gear connected to a very similar LN46C650 for over a year without issues before I switched to the C750.