If its the logo blinking every few seconds and not responsive to anything. Most likely a LED backlight issue. Is one part of the screen darker than the other?
it can be due to damaged power board or the main board.
your best bet is backlight since its the cheapest(yet the most time consuming) and troubleshoot onwards if you want to save the tv. Main boards hard to find and expensive, so consider buying a better brand tv in the future to avoid this mess.