AFAIK, there is no such thing as a "Digital SVGA" interface--VGA and SVGA are analog signals (basically analog RGB and sync signals), although the modern VESA version of VGA adds a digital data channel for "plug&play" configuration. That would not come into play if you were converting Component Video to SVGA, as there is no equivalent digital channel with Component Video.
The TV manual implies that there is really no difference between the two (S)VGA inputs other than (S)VGA1 defaults to "Computer/Text" mode, while (S)VGA2 defaults to "Video" mode. Either of these can be changed in the menu system.
It also specs the maximum resolution as 800 x 600 on either input, so the whole thing is rather puzzling. I would suspect the RCA receiver (they alternately refer to a "Proscan" receiver that will also work with the TV) converts 1080i (1920 x 1080) to 800 x 600 SVGA analog, but that would mean the TV wouldn't work with any HD receiver that didn't do that (which would likely be almost any other receiver).
I'm a bit confused, what is it that you were able to get to work?
I do see the manual says it supports plug&play on (S)VGA1 (but no mention for (S)VGA2) and also says: "If you have connected a digital set top converter, you must connect to both the (S)VGA2 and INPUT2 inputs in order to view both digital and analog signals."
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