Hi! I just replaced my computer, but the monitor still works beautifully (LG Flatron), even though it only has a VGA input and is not HD compatible.

I would like to know if there is a way to use either output from a TV tuner box and convert it to VGA signals for the computer monitor. I searched the Net for it and found several boxes to do the opposite of what I'm looking for.

Does anybody know if such a converter exists, or if not, is it possible to put one together from stock parts and a few cables, even if soldering and building a simple circuit board is involved? I work in the electromechanics industry but not with audio/video equipment. Thanks.