Our Sony Bravia started flickering in the top third of the screen, then went black within minutes. Sound stayed on.
After unplugging power cords, checking connections, cycling unit, Still no change. At start up, Sony logo comes up then quickly goes black.
Having researched the web, suggestion was to use a flashlight on the screen at an angle to see if faint images could be seen. Found images were present. So further search revealed three faulty LED ribbons. Carefully removing chassis from screen, reveals the 3 led ribbons. I removed them and bench tested to find 5 LEds were faulty, at least one on each strip. Waiting for new replacements from Hong Kong to arrive. Hope this solves the problem.