KP-43HT20?

My screen all of a sudden went dark, I can still see the picture but its very dark with the red being dominate. It just happened the first time the other night and since then it will be like this for awhile and then it goes back to normal, but seems to be going dark and staying that way for longer periods of time. Is there anything I can do, or can you direct me on the parts I may need to fix it?