upscale player/HDTV prob (1 Viewer)

[Russell B]

I have a Samsung LN-T3253H LCD HDTV (720p-native, 1360x768 PC) and a Philips DVP3960 HDMI upconvert dvd player. With the HDMI setting on the player set to 720p the picture has scan lines or something on it. The picture looks better with the HDMI set to 1080i. I switched out the HDMI cable for components and the picture looks better than it did with the HDMI.
What could be the problem?

 

[JeremyErwin]

Calibrate.