Hello
Open the TV and check its power supply board for any bulged capacitors or blown out fuse are there or not. If there is, replace it with same size and capacity. If fuse is found blown up, replace it with same rating. its ratings will be marked on it rims. These will be of glass cartridge types, and are pluged in types. They can be detached from its holder and can replace a new one. If the replaced new fuse also blow up as you switch on your TV, make sure that there is some short circuit with this board. Normally, power supply boards are very difficult to repair and make right. it is a best practice, to replace them as card basis. The board cabn be bought from most of the elctronic spare part shops at your town. I hereby attaches two pictures. One is not with your TVs, only to make you know how a bulged capacitor will look like. The second one is the picture of the power supply board of your Tv itself.
See the bulged cpacitors [top side]; red arrow marked ones. A good one can be seen at the top right with flat top surcace.
This is the power supply regulator board, your TV have. OK.
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