It appears that Marriott has been replacing old TVs with new LCDs. It's a step up, however, not all your properties has the same TV features. I was able to connect my computer to the LCD in Springhill Suites and Townplace Suites, I was able to conncect computer to the ones in Residence Inns, but I could only see the picture on TV, but had to listen to the sound via the computer speakers.
When requesting help, Hotel staffs claim no knowledge about something like that. I am old, but I am not that techno-challenged!