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Your code 18 translates directly to this in the service manual: Loose PE or PE2 connector (no 12V from PWB-POWER; Engine Failure
Sounds to me that from that description, your next step would be to unplug/open the TV back up then go ahead and remove and very CAREFULLY replace all of your plug in connectors, since it's unlikely you broke the Light Engine - but very likely that something is loose.
That's all outlined on page 28 below:
Well you need to thoroughly check anything and everything that "could have" possibly been jarred, moved or otherwise shaken up during the procedure. There is what that code means- a connector is loose or your Light Engine has failed? It seems more likely that you would have a loose connector than a failed light engine, would you agree?
Did you click on that service manual I posted for you? I can pull it up again, but I posted it so you could look up and interpret those codes yourself as well.