On power-up the machine seemed to try to power-up, and after 3-4 seconds the PSU5 shot out smoke. I quickly cut the power. Attached a photo of the aftermath.
Upon examination it's possible that the teeth of the lock washer bit into the nearby traces. I'm planning to order more PSU5 and try again with smaller nuts without a lock, but had a few questions before I try again:
- Is it possible PSU5 would fail this way if either/both of those traces got shorted to ground?
- How would PSU5 behave if output was directly shorted to ground?
- Is there anything else you can think that I should watch for before trying again?