|The 15 pin video is a standard VGA output for feeding a computer monitors. It's is nothing like S-Video which only has four pins.|
You need a VGA-DVI converter. What is the D-sub connection? D-sub just describes the physical characteristics, not the signals it is carrying. In fact the 15 pin video out is a D-sub connector but may not be the same as on the TV.
Does the TV not have composite video input as most have. You would be just as well using that as you will not get DVI/HDMI quality from a VGA output.