Blotchy Screen on older RPTV (1 Viewer)

[Dave Corbitt]

Maybe someone can give me some advice. I have an older Toshiba RPTV with the usual Fresnel / lenticular combo screen. The screen has developed blotchiness which can be annoying during screening of anything. I took the screen off the set and opened the sandwiched Fresnel and lenticular sheets to see what I could see. The Fresnel lens appears to be the source of the problem. At first I thought it might be mildew but a closer look at the Fresnel doesn't quite look like that. I tried wiping the fresnel ridges with a soft damp cloth and the blotches do not diminish. Any clues as to how I can resolve this without replacing the Fresnel lens?

Thanks
Dave

 

[Dave Corbitt]

It's been several years since I posted that. I got rid of the RPTV a couple of years ago but not until I replaced the Fresnel element. It was etched somehow and that caused the blotchiness. I suspect it was mildew from the basement room I had the home theater gear in. Replacing the Fresnel fixed the problem. I then bought a front projection HD Yamaha unit and gave the RPTV away to a friend who still uses it. It's now 12 years old and still working as well as can be expected for something of that design.