I have a Christmas animated train that goes around the tree that lights up and plays with or without music. It had a bad plastic pinion gear on the can motor which turns out to be the exact can motors that Lionel uses. I fixed a couple Lionel train lamps that had the same problem. A split in the plastic pinion gear . I ordered some cheap ones from China and was able to match up the size and got it to work perfectly but then when I changed to what I thought was the proper 5 V DC transformer it ran for a split second and then quit. So something happened on one of the components on the small circuit board. I was reaching out to see if someone could guide me a little bit on how to figure out which component to check. I was going to snip the wires which are all color-coded so I could test it on the bench or troubleshoot it rather but I’m not real good with circuit boards I thought you might be able to help? 
Thanks
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