Many Sony models don't support SVCD at all. Try looking at the DVD player compatibility list at
http://www.vcdhelp.com and see what it says. It could be worse. I had a conversation once with a guy who told me that a major Japanese manufacturer (I think it was Toshiba) sold a DVD player in the US that didn't even play VCD! I don't mean it didn't play homemade VCD, I mean it didn't play commercial VCD either.