I recently acquired a Bachmann FT-A DCC On-Board locomotive with a PCB01-B board.  I have a Digitrax system and when I put the locomotive on powered track, I get no response from the locomotive.  I'm getting 14+ volts to the red/black wire solder joints on the pcb from both trucks, but that's it.   No light to the LED.  What can I do from here to troubleshoot?