If the power supply board in the set is defective, you have to replace it, or repair it. What determination else? If you wish to get some details; visit the site linked here. Pull up older posts.
https://electronicshelponline.blogspot.com//
SOURCE: tv wont turn on
You can check the two board.
One is Power board another one is Y-main.
You can find right part with serial # & version #.
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