Toshiba 57H81 57" Rear Projection Television "tv little picture corner rest" Questions

...TV. The DMD board is the board with the million little mirros on it. The white squares indicate a few mirrors sticking in the on position reflecting the light from the lamp constantly. The black are ...

TV that is only about 5 years old. Yesturday, A black triangle appeared in the upper right corner of the screen outside of that is a red bar that also is on a 45 degree angle adjasent to the triangle,

...TV will be a little door with another Finger screw to loosen, once off move the bar holding the door closed and remove the plate. 5. You will need an Alan wrench, the screw will be in the upper left ...

...TV back, the colors have seemed a little off. I was playing around with the picture settings, and when I turned the "color" all the way down, you can easily see the upper right-hand corner is darker, ...

...TV has worked fine and then just stopped. I unplugged it and gave it the rest for a reset but to no avail. Where do I go next? I am handy and willing to attempt any repair. Just need to know what to ...