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TV does not power on - Mitsubishi WS-55819
The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts.
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
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Mitsubishi Rear Projection TV Model WS-55311
Rear projection TVs are dinosaurs. Sell it if you can get anybody to buy it and get an HDtv they're pretty cheap now not to mention thinner, lighter and better for your eyes. Imagine the space you'll save if you mount it on the wall and the cost of electricity. Not trying to be a jerk but it's time to move into the 21st century. The picture is waaaaay better.
Shadowing of picture
A shadowy or 3D image is caused by the convergence not being aligned. If your model has a convergence menu goto it and see if you can adjust the colors so that they are all straight and aligned. If so the 3d shadows will go away. If however it wont adjust the convergence has failed and would need to be to repair the TV yourself or with a company. Convergence repairs are common a fairly easy DIY fix.
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