OOW is out of warranty. No TV Techs diagnose in forums as folk may sue if they guess wrong. Today's litigious folk mean that even I won't tell you to replace this or that and that all choices are yours as well write that there are LETHAL voltages inside which you assume all risk.
With that out of the way a TV tech either uses their prior experience or gets out the service manual to follow the diagnostic path in the manual. There are folk that want to do such repair without manual or experience so my advice on that is to "replace the cheapest part first." That sage advice came from a fellow engineer.
I have read the posts and other items about this problem, the red stand by light blinking and the T.V. not turning on. I took the back off and looked at the three boards in the back but saw no defective looking capacitors, no leaks or bulges. The other posts from years ago stated that it could also be the mother board. Looking at the three boards from the bottom of the T.V. the board on the right looks like the power board, the one on the left has all the connections for antenna and dvd players and stuff so I am assuming that the board in the middle is the mother board everyone refers to?
Am I right? I didn't have any clicking sound, like others mentioned just the flashing red stand by light.