Widescreen TV and the NES

[FlufflePuff]

So, Im looking at buying a Panasonic 44" LCD projection TV, but I wanted to test my NES on it first. So i hook it using AV cables, turn it on, and I get a solid bar of color on the left and right side of the screen that mirrors the main color on the screen. THe left side has a bar about an inch and a half thick, and the right side is about a half inch thick. It shows up on all modes (full, widescreen, 4x3, etc). It shows up with any games, and it shows up on all 42-46" tvs I tried it on. When I tried it on a 50", the problem seemed to stop. I have no idea what's going on, but I really want this tv. Unfortunately, I can't tolerate the bars, so I have to find some way to fix it. As a side note, the settings in the panny, won't let you move the picture to eliminate the bars. Any help would be greatly appreciated.

[SkiDragon]

Im not sure, but it could be the "overscan" made visible by the fact that the screen is wider.
Dont feel too bad, I once passed up a nice HDTV because it made NES games look bad, but it was a different problem.