Tried reset procedure by unplugging, pressing volume down & channel down buttons and plugging back in without any success. Still no picture at all. When this first started, I was able to get the Sharp logo after unplugging and reconnecting the set. Now nothing seems to work. The TV is only 2 and one half years old and my extended warranty ended 6 mos ago.
There isn't much that is repairable. It is generally just buy a board. There are used boards on e-bay from sets where the screen cracked. Take good pictures of all the markings on the boards in your set. Also watch a video on youtube to disconnect the flat ribbon cables without damaging anything.