Screenburn is caused by fixed images. Any and all fixed images. Run a fullmotion, fullscreen videogame on your RPTV any time you want - but NOT Pong, or Home Shopping Club, or any other set of images which include fixed images in them. The flat plastic screen you are watching, on an RPTV, is not what burns in. The phosphors on the CRTs themselves are what get burned, unevenly and inappropriately, which is the actual definition of screenburn. They degenerate more in areas of higher use than areas of lower use, it's as simple as that. Screenburn can happen from greybars - usually causing unwanted lines of demarcation; or side blackbars - the inner section will be darker than the sides; or top/bottom blackbars, from playing 2.35:1 movies on a 16x9 - 1.78:1 - screen; or station logos, the worst offenders being MSNBC, FOX, CNN, etc, esp. the ones in white, where all 3 colors - and therefore all 3 CRTs - are affected. I have also seen tickertapes running across the screen cause screenburn. This last phenom, and many others re. screenburn, can be remedied by leaving the Contrast at superlow levels whenever the screens - or rather the CRT faces - are threatened with CRT-damaging fixed images. I sometimes run my Brightness down all the way also, till my pic is just a dull glow. This is the only way to rest assured your CRT faces will not be harmed by the plethora of ways to harm them that are out there these days, during this changeover from 4x3 to 16x9, and with station executives apparently totally clueless as to the damage they are continually foisting off on us unsuspecting clientele of theirs, every day they keep a stationary station logo up there at all times, during their offerings. Mr Bob PS - The ONLY remedy for screenburn is CRT replacement. Putting up an all white pattern is the best way to check and see if you have any. If you do and it is being caused by station logos, PLEASE call that channel and complain, at the HIGHEST levels possible.