It's unusual that neither the movement functions (LCRU1) nor RailSounds work, as they're basically wired independently of each other.
I've attached the wiring diagram for your loco. Two things to note:
1) There's an error in the diagram -- the solid red arrow points to the location that the violet wire should be connected to. Chances are your loco is wired properly in this regard.
2) That same purple wire is the serial communications link between the LCRU1 and RS2.5. Keep reading below.
In conventional mode, the absence of communications on that serial line will cause the RS2.5 board to start-up when power is applied to the track. In TMCC mode, the LCRU1 board sends out commands to the RS2.5 board to wait until a specific command is received before it starts up. If you don't have operation of either board, there's a limited number of things that could have happened:
-- There's an internal short somewhere in the locomotive that your transformer's breaker should be catching, but isn't.
-- The LCRU1 board failed in a way that it's still communicating with the RS2.5 board, but doesn't respond to any of the TMCC commands. I don't think I've ever seen this happen with an LCRU1, but I suppose it's remotely possible.
-- Something catastrophic happened to take out both the LCRU1 and RS2.5 boards.
If you're adventurous, here's the next thing to try: disconnect that violet wire between the two boards that I've highlighted on the wiring diagram, put the loco back on the track and apply power. If you still have the same results, then you almost assuredly have independent problems with both your LCRU1 boards and your RailSounds sound system.
TRW
