I had the same problem with mine and fixed it by disabling the front buttons from the menu.
I fixed two WS-????? mitsubishi 73" TV's with a similar problem (got them for free for that reason). If the power LED keeps blinking after it shuts off, it is very likely this problem. It took me 1 hour and $5 in parts to fix it. Just search for 'mitsubishi blinking green' and you will see the solution.
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When I turn on the tv it stays on for an hour or sometimes for 5 minutes. What's the problem?
How is this done? How are the front buttons disabled from the menu if TV will not power on?
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