ps3 ps1 pal ntsc

I have a phat PS3 with Rebug firmware. Every time I try to launch a PS1 game on my PS3, I get an error saying "You cannot play this game at the current video output settings. (80028F10)" I have narrowed this problem down to the fact that I am trying to play a legit NTSC PS1 game, and 480p is not...