@Norm Charbonneau posted:Sounds (ha sorry) like you killed the LM4861 audio driver. Lionel uses these in a bunch of their audio boards from my research. I think it drives the speaker directly, at least the tech sheet supports that. Perhaps the audio board might be salvageable if you replaced the driver.
I’ll give it try Norm as long as somebody can point to which discrete component that is on the board.