You would be hard pressed to justify it. Probably needs a new power controller installed as well, since LED is a tad trickier than the basic LCD models to replace. Keep in mind that any used 'whole' quattron you find on fleabay might have had other damage/etc, that you won't discover until you spend the time installing the parts in yours, etc. Not worth it IME.
Sorry you lost such a nice rig though. I really like the big Sharps.
I have been told the panel on my TV is done. Can i find a used one anywhere? TV is a sharp LC -70LE857U.