I’ve been running two Mini Led Moving Head Units for around two years. On setting up a few weeks back one of them for want of a better description just twitches, the condition stepper motors, cooling fans and also the led on the power board. After watching, 10W LED "blunty" moving head disco light teardown on YouTube, I used boards from the good light that I had to locate the fault area, and arrived at the power board being the culprit. Thing is at this point It’s pinning down the likely faulty component, a touch out of my depth, since when I was last employed in electronics was in the days of valves back in the 60s. Has anyone any ideas on this?