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This could mean the DM (HD tuner) failed. In the future connect your TV to a good surge protector. The manufacturer's solution is to replace the module and swap the memory from the failed part to the new one. (Except for the memory it is just an unplug one and plug in the new one.)
If you are handy with a soldering iron, you may be able to fix this by opening the DM module and removing 8 capacitors (as I understand the board) and replacing them. All 8 are 1000uf 16v 105C Capacitors
This URL has an good explanation of the process: http://www.hometheaterspot.com/fusionbb/showtopic.php?tid/137881/
You have a bad DM board - the capacitors are bad and need to be replaced. I was able to replace them myself. There are no replacement parts available and many repairmen will charge hundreds of dollars and there is no guarantee they will fix it.
Chances are very good that this type of problem is a cold solder joint on one of the circuit boards. Unless you know exactly what you are doing don't attempt to fix this type of problem. The circuit boards in rear projections TV can carry enough voltage to kill you even if the set is not plugged in. Contact a repair shop and get an estimate. Then do a repair vs. new flat panel replacement comparison.
Hope this will put the right perspective on your problem.
Not good news for you;
Mitsubishi TV assembly
Since this seems to be an entire board, I suspect that it may have failed and some devices on it may be proprietary making the repair impossible.
The 'chip foundries' are capable of designing a complex integrated circuit in weeks and then giving it a unique part number that belongs exclusively to the company that designed it, making the part impossible to buy from a normal supplier.
If anyone is interested and junking this set due to the high assembly replacement cost, I'd like to get one of these to see if the board is repairable.
It may have inexpensive components that have failed and can be easily replaced.
I have the equipment and knowledge that would allow me to either repair it or at least judge its repairability.
If you are interested, please email me at:
freetekATlycos.com(remove the 'AT' and replace it with the proper symbol.)