Okay, it's seems as if I've been reading for days about this common D-board failure. Here is my experience with the 6x flashing stanby LED. First, as in all the threads that I have read. The problem has been identified by others as possibly being the two IC's, IC8002 and IC6501. Well, they have had creditable success with replacing these two IC's with the newer chip having the "DB" suffix.
I have had the same 6x flashing LED issue. I have replaced the two IC's with the new chips having the "DB" suffix (using sockets). The television still doesn't power on. One noticeable difference is that the LED is no longer flashing but seems to be normal. When pressing the power button everything else is the same, relays click in and then out with no attempt of powering on.
I have double, triple checked everything (cables, connections, soldering) and nothing looks or seems.... hmmm, well, messed up.
Does anyone have any other suggestions or thoughts regarding my set?