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I would look at the source for the Hd signal as being the problem--if you are using some kind of cable or sat box it will deliver the signal to the DTV input on the back of the set--this is the HD input for this set.
It is possible to have a problem like you describe be one in the set--but very unlikely----have you looked on that green signal board for any signs of Glycol?
Anything that will produce a 1080 signal to the DTV input should tell you if the problem is the set or the source of the HD signal that is causing the problem.
If you have questions or need advice let me know--I am here to help people.
if this information has helped you rate this solution as i do this here for free.
Hello, asnowman here.
I had to reply to this post, as the other would not let me.
Comment posted on Oct 26, 2009
Thank you for your help, do you know what board this is on? signal, main, or power?
Your televsion is the 73411, and I think that your convergence IC's are on the center board, (called the power board, even though it doesn't have the flyback on it), if they are not they are on the signal board. You can't miss them they are attached to a very large aluminum heat sink and the IC's are very large as well.
I hope that this answers your questions.
If you need further assistance please comment to this post and I will try to help you further. Thanks for using FixYa asnowman
The STK392-570 would be the big IC's mounted to the heat sink on the convergence board. The 0244211 are capacitors that I would guess from your problem would be on the power supply (usually the top will bulge if these are bad)
The Color Signal on this Model Series travels across three boards before being sent to the CRTs. The 3DYC Board, Signal Board and the Terminal Board. Most likely, the 3DYC Board or the Signal Board is causing the problem. I have had intermittent solder connections on the 3DYC Board to cause no color problems. This Board plugs in and is located on the left front of the Signal Board as you look from the rear of the chassis. If you feel you are not up to the task to work on the set, call a Mitsubishi professional. To find one, call Mitsubishi at 1800-332-2119.
I hope this helps,
Sorry, but when the coolant leaks down onto the small signal board, that board will never work right again. The fluid penetrates the board itself since the board is double sided and has many feed-throughs. The fluid gets under the surface mount parts and just eats through the copper traces, part leads and board itself. After trying many times to clean and restore those boards, not one has ever worked right again. The boards are NLA from Mitsubishi, so the set is done.