Here is a past poster with this same experience here:
And more from other forums including Sony...
I have a 7 month old Sony Bravia 75" purchased from Best Buy and all was well until the other day I noticed lines across the screen and what looked like a cracked outter screen. Problem is, no one touched it. No one was near it. It just started cracking on its own.
*THIS IS APPARENTLY A KNOWN AND WIDELY REPORTED PROBLEM
I'll provid pics, links and eventually video. I'm getting ready to approach Sony about this though I'm told they refuse to recognize/support this issue.
I'm raising the question here to see if anyone as experienced this recently, or if they have advice on how to proceed.
(Will add some pics and vid to this thread later so you can see the problem)
Any advice, chime in please. Thanks!