Mitsubishi WS-55819 turns off after about one second upon power up. Help

This is a classic switchmode power supply, shutting down to avoid a fire, explosion, or both. This set had developed a problem, that is so severe that the set must be shut down, This set should be removed from the Power, and in my professional recommendation, you should get a "Quote" for repair, from, an Akai, Approved Service Center, this point is very important for a good result, Always contact, their local, "Head Office" Now, when you get the information you want, then you can decide as to repair of replacement. The reason we want an approved agent, is that way, all the engineers are trained on their own brand sets, they have seen almost all faults, and will get the job done quicker, and for less cost, and usually have parts on hand, also sometimes, there has been a service bulletin in issued and the repair may be subsided or even free.
http://www.retrevo.com/support/Mitsubishi-WS-55819-TVs-manual/id/276bh851/t/2/
http://www.mitsubishi-tv.com/pdf/ownersguides/WS-55819.pdf
http://service-manual.eu/model.php?id=2703
Above, a service and repair manual, above that are two user manuals.

did you try contacting the Mitsubishi service center for the part?

Bad STK ICS

Code 12 indicates no error. Push the Menu and Device buttons after the TV has shut off to get the proper code, not after you unplug and plug it back.

It seems your set is not Mitsubishi WS-55819 so it will help if you can give the exact model.

Sounds like a problem with the standby power supplies is losing the standby which acts as if the TV had been unplugged. I would check the stand by power supplies

No, that'll do it. Once you've changed em you'll know right away if somethin isn't right. But take faith and fire that puppy up. If the pix is good you did good. If something is amiss. I'd be happy to walk you through it. My money is on you though.

ok when the power is plugged in hold down the menu + device buttens for five sec what is the error code there should be two sets of numbers....
like 1 pause 2 let me know and i'll see what i can do!

Code 22 indicates that your set is in shut down due to what is called Short Protect. The most likely cause is the Converge Ic's drawing too much current and opening one or 2 fuses. Normal repair cost varies by area and servicer. Expect 250 to 350 plus the service call. I normally do this on site.

Mitsubishi - WS-55809, WS-55819, WT-46809, WS-65809, WS-65819 PCB ... try this

Wade, My dad has this same set and had the same problem -- Sears came out and replaced the power switch.