I have an older HDTV-ready monitor from Mitsubishi; the 50803 model. It uses the 5 BNC connection for HD input that is labeled as RGB+HV. Any chance a standard DirecTV HD Receiver from the likes of Samsung etc. with an RGB output can be input into this TV using a conversion cable? There are several RGB(15 pin) to 5-BNC cables out there, and I'd love to get another year out of my old set by being able to watch HD today. The only method of HD input I know FOR SURE works is the off-air HD-1080 receiver that I have. Any assistance is GREATLY appreciated!