How are you connected from dvd player to tv? component, composite? Is your tv capable of displaying PAL format videos?
I used to own a Philips DVP3026 before, connected via component cables to a dual format capable tv (can accept NTSC and PAL). What i did was set the dvd player to output only in NTSC, so even if the DVD i'd play is in PAL format (which the TV would accept anyway but I didn't like the 'flicker' of PAL videos) it would always send it to the TV in NTSC.