[maxhifi]

This is a 41 inch rear projection TV from 1999. Acts as follows:

TV turns on normally, and produces a nice bright, sharp picture. Then, anywhere from 10 minutes to an hour later, the picture becomes monochrome and very blurry, with a striped interferance pattern of some sort. Same issue with both tuners, and all three video inputs.

Strange thing is, the on screen display still works normally, and is not affected by whatever is killing the picture. Tubes are in good shape, and don't really want to trash TV.

Would like to hear any ideas.