I've got the KDL-60NX720 that has now failed. When I power up, the screen comes on, led goes green, then after about 3-4 seconds the screen shuts down and I get 4 red led blinks. The "helpful" tech at Sony support says I need to bring it to a repair facility because the code is a failed board or screen problem. (Wow, that was helpful). Searching around I've found some sites say the 4 blinks is related to the backlight.
I am fully capable of fixing this myself once I find the problem (even to the extent of replacing hi-density SMD's). If anyone can provide any information as to the real failure and the fix, that would be appreciated. I'm sure I'm not the only one with this issue.
I've searched the net for a service manual but cannot find one for this set. If anyone knows of a source for the service manual, please post.