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The digital board is bad and needs replaced. If you can get the board you hace to crack the metal chassi . Its a pain but if you are mechaniaclly inclined you might be able to do it. Pull the chassi and dissassemble. Lots of screws. Don't force anything and study it closely. It's tricky. There is also a memory transfer proceedure. The board from Samsung comes with instructions.
Remove door on left side and clean foam pad. Put dorr back on or set will not turn on. clean all vent holes if dusty. If this dies not fix then you could have a bad sensor or chassi could need to be rebuilt.
The fateful Green LED Blinking problem can be fixed only in my opinion by sending the Chassi Assay. out to Mitsubishi for Refurbishing. It is a costly endeavor but it will fix it. You can contact Mitsubishi at 800-332-2119. They will need to refer you to a Auth. Mitsubishi Service Facility to come out, remove, and reinstall chassi. Refurbishing of the Chassi would cost aprox. 700.00 to 800.00 plus Labor and Service Call Fee if any.
I hope this helps,
There's a small diode on the power supply board that causes this. Its identifiable by its purple stripe. You will need the correct type of diode to fix this properly. The diode supplies the standby voltage to the system control circuit, so when it fails, the TV will never come on.