I have a Lionel B6 switcher from 1988, 6-18000. One day a few years ago, the sounds went out. I took the board out, inspected it and found no issues with any of the circuitry, even under a scope. With modern circuitry, things are so compact and sensitive that its earier to replace the board for a newer upgraded one. But with this board there is plenty of room for repairs on most components. And I apreciate the classic sounds.
The board seems normal and the speaker does "chirp" when first powered up, so there is life in it. The "whooshing" noise is gone when at an idle. I do not get a whistle or bell. Does anyone know what could the issue be? Even if it was static that shorted out the board. I feel very confident that i can replace the components that are gone, as there is a lot of room on the board.