Your logic board's lamp light up -- it's functioning.
You changed the y buffer, y main and power board Even with the y buffer and main disconnected I still can't get a DC reading from the power supply. Only on start up then rapidly back to 0v
That indicates the power supply does turn on, but shuts down quickly to protect itself. That's because the Logic board does not like what it is reading, and the Ysus protect line is shutting down the entire system.
Disconnect the Ydriver from the Ysus Reconnect power to the Ysus.. Does it now stay turned on?
If so, the Ysus is ok.
If not, the Ysus has been damaged by the Ydriver.
And since the Ydriver repeatedly smoking itself....the only thing that can smoke a Ydriver would be a bad Ydriver IC or the plasma panel is eating Ydriver ICs for lunch.
Listen, if you REALLY don't trust the fact that you replaced the boards all at the same time, you'll want to replace the Ydriver, the Ysus, and the power supply board with new boards all at the same time. Then you can trust the boards haven't been killing each other, and if the Ydriver smokes again....then only the plasma panel is the board killer.
But.....this is what I do.
I get the Y driver disconnected from the Ymain. I connect the Power supply and Ymain together and see if it STAYS TURNED ON with no problems.
Then I add the Ydriver and try it again. If it stays turned on, THEN I connect the plasma panel and see if the Ydriver ICs smoke.
That's conclusive to me that the plasma panel is bad.
But you've smoked two Ydriver boards. That to me is a bad plasma panel.
That's just been my experience with plasma TV sets.