I have 3 Saturns, a round button, and 2 ovals.
One laser eye between them. 🙁
They all work, but,...........
I think I burned out the round button one by playing Blazing Heroes with the console on the carpet. 🙁
My advice: Buy another Saturn on Ebay. Between shipping both ways, and the repair fee, you'll pay much less. And you'll have a pre-existing parts stockpile.
BONUS: You'll be able to identify the problem with the first Saturn by swapping components. Assuming you get the same model,............