I have a Mitsubishi HD 48" rear projection ws48511. It turns on with the front panel power button. Any other button causes the screen to go black for 3 to 5 seconds then the picture comes back. The remote does nothing. The reset causes a blinking green light for maybe 30 seconds then goes off. Power button turns it back on--problem still there. Two years ago had the same problem. Wife called repair man, says he replaced small tubular device in front. I am assuming that was a fuse. Where are these located? What would cause them to blow? How do I check for error codes?