Got out the old Lionel 18064 Mohawk from 98 and ran it around the layout yesterday during a visit by a train friend. We noticed the sounds dropping in & out and after a few laps, pulled the coal pile to install a battery. We noticed that the heat sink on the power supply board was hot and Rich advised to check to see it the board was loose. Sure enough, it was. Put it aside and later removed the shell and pushed the board back snugly onto the pins. Back on the track when I applied power it started smoking. Took it back apart & removed the power supply board so now the engine runs and the TMCC works but, of course, no sounds. The only obvious visable damage appears to be a cracked voltage regulator but no clear reason why it happened. Both the power supply and the railsounds boards are still available from Lionel. Should I risk putting a new power supply board in and hope it doesn't smoke. Should I just replace both boards? Should I take it to Lionel(they're just a few miles away) and see if they can fix it?
What do you think guys?