I have a Sharp 50" HDTV ready receiver and a DTC-100. I don't want to buy the converter from vga to RGB if I don't have to, so I got a VGA to BNC cable. I cut off the red, blue and green BNC connectors and soldered on RCA connectors. I plugged the red into (Pr), the blue into (Pb)and the green into (Y) on my TV. Is this correct? I get a black screen with sound when I push the HDTV button on the DTC-100. It works perfectly in the regular mode, I get 199 and 509. Any suggestions?