gunrunnerjohn posted:OK, it's a bog standard TMCC package, it uses all Lionel parts. There is no cruise as I see the standard DCDR motor driver.
If you're reseated all the boards and made SURE there are no loose or broken wires, the next step I'd go for is replacing the R2LC. I'm assuming you did reprogram the locomotive, right? If not, do that first.
STEP 1: Move switch on locomotive from run to program.
STEP 2: Turn on Command Base.
STEP 3: Place locomotive on track, then turn on power to track.
STEP 4: Press “ENG” then input locomotive ID#. Press “SET”.
STEP 5: Press ”ENG” then input locomotive ID# again.
STEP 6: Press “AUX 1”, then input the reprogramming code number that
corresponds to your locomotive, "4" for this locomotive.
STEP 7: Turn off power to track, wait ten seconds.
STEP 8: Remove locomotive from track, move switch from program to run.
STEP 9: Place locomotive back on track. Turn power on to track.
STEP 10: Press “ENG” and ID#, then operate as normal.
I have tried that several times 
I did find a R2LC and replaced it. Same result.
