Television and Home Theater

Can anybody tell me how to trouble shoot? It was working fine, then I left the room and when I came back it has a blue screen. Cable works, volume works, menu works and the images of the connections (comp 1, comp 2, etc.) come up as well, but no pic other than blue screen.

Thanks!
-dave

Hi, I am the owner of a Mitsubishi TV model WS-55859 which is now blicking and shutting off repeatedly. Before this happened it gave me a blue screen - came on and off  and gave me the message RGBHV or YPrPb may be invalid or check power source.  We replaced all seven capacitors on the DM module board.  The TV came on with the same message. It flicked for a few seconds and then the picture and sound came on. It operated fine for twenty- four hours until we turned it off.

My Mitsubishi WS-55613 is getting worse.  About a year or so ago I had the blinking green light which is common on these tv's.  I replaced the capacitors and the problem was fixed.  What a great day that was!!  Now the problem is a different.  There is no blinking green ligt problem but now the screen get squiggly lines sometimes worse sometimes they are not there, pretty inconsistant.  But then the TV will turn off.  I can restart the tv and sometin=mes it will stay on for an hour or so and sometimes it will only stay on for minutes.  Last night when