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If you have a volt-ohm meter, the first thing to do is to unplug the TV, then set the volt-ohm meter to resistance, then measure across the white fuse. If the resistance is NOT less than 2 Ohms or 3 or 4 at highest, the fuse has indeed blown.
Look at the metallic ends of the fuse. There should be fine writing engraved on the metal ends of the fuse. Use a magnifier if needed... to see the writing. It will tell the fuse's ratings (Volts, and Amps, or V and A.)
By the way: if the TV is 4 months old from being purchased as a new device, then if you open it, you void the warranty. Don't open it. Don't mess with it. Invoke your warranty rights... unless it was sold to you Used, of course, in which case it has no warranty.