Mac to HIteker Tv through HDMI
OK, we are beating around the bushes here, so to make progress this is for your Information and not a answer to your problem.

The MTC26T42 is a Nvidia HD Audio, not a display!

Here is what you should look for (example for my Samsung TV) connected via Thunderbolt to HDMI-HDMI.

This is from the About this Mac (notice it says Television: Yes.)



This one is from the system preference -Display



And this is information from the ColorSync Utility.