Samsung HL-R5668W 56" HDTV "tv screen going dark wii" Questions

...screen. When the noise died down after about a minute, the map disappeared. I heard the hum of the fan click off after a few more minutes. Does it sound like the color wheel is bad? The fan perhaps? ...

...tv picture keeps going dark. When I change the channel it stays on for a few seconds (it has wavey lines through it, and then it just blanks out. The channel guide graphics & Wii games work just ...

...screen menus display correctly, I think the problem may lie in the signal board or the input board on the back of the TV that plugs into the signal board. I will greatly appreciate any suggestions or ...