I've had this set, Sony KD-34XBR2, for about 8 years. It just went bad on me.
It wouldn't start up, I could hear power kick in but screen stayed black.
Unplugged overnight and set powered up next day, image visible but not quite right, there was a little zoom to the image and it was slightly off. Then volume started going up until it was really loud and garbled. Could not control volume, eventually turned set off. Now I don't get image at all, but I do get a series of 11 blinks of the standby light, followed by bursts of 4 blinks, continuously.
Spoke to a tech that told me to replace B Board, said it was easy. So, I've been doing some research and I've also come upon a lot of articles that mention the D Board in these sets.
My question is, what are the specific functions of the "B" Board and the "D" Board? Sony sells both and replacing them is not a problem, I would just like some clarification on what the function of each of these boards is.