EDTV or HDTV allows for 480p. %90 of the time if it is HDTV it will have the hdtv logo on the front of the tv. Or a quick way to check, do you even have component inputs on the tv? If you do, then next google your tv and see if it is an EDTV or HDTV.
But if it is a tube crt.....and not a flatscreen....then no, it will not play 480p.