Re: Panel used in multiple models - Interchangeable parts?

I just came into the possession of an E550VL recently that is having the power cycling with clicking noise.

I am having the absolute worst time tracking down a replacement Main Board.

I can't seem to find a site that isn't sold out of it. Am I looking in the wrong places? What would you guys suggest.

I'd like to try to get the smart TV functionality but at this point I'll settle for a functioning TV.

Thank you in advance.