Originally Posted by wsxcde
The bluish color "no signal" screen may come from the firmware update. I have the latest firmware in my Nov 2011 build 55HX929. This new "no signal" screen really shows off the DSE problem of my TV (especially since I turn down the backlight from MAX to 1). Please see the attached pictures for the "no signal" screen, solid grey screen, and solid white screen. For a solid white screen, there are large areas of yellow tint on the left and redish tint on the right which look worse in person than the attached screen shot. The DSE was not as bad when I got my TV back in last Nov. I tried loosening the screws at the back but this didn't help. I don't know whether calling Sony will help since they probably would say that this was "normal".
I finally got around to call Sony and sent them the pictures last week. I just got a call back from Sony. The rep said the technical team reviewed my pictures and said this was normal. Basically, I need to forget about connecting my set with computer and game console since the DSE and color tint are quite apparent on solid background.
I also got a chance to see a 55HX929 with Feb 2012 build. It has horizontal bands in addition to DSE and color tint issues just as bad as mine.
So, don't look for these screen defects if you don't notice them since Sony will probably won't replace it under warranty. If you are within your 30-day return window with the retailer, the replacement unit will probably have the same issues.