Internal microprocessor short or something similar. Is the most likely cause. It can happen after dozens of heat expansion and contractions.
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No way of fixing this short?
I don’t think it would be possible. So many tiny traces how would you even start looking for the short? It could also be a bad diod or transistor internal to an on board chip.
17 days later
I had that same issue a few weeks after I received my Replicator 2x… luckily I was under warranty so I received a new mightyboard… that’s the issue… one thing I could think of suggesting to avoid that issue (microprocessor overheating) is to wire a fan perpendicular to the board to push away the heat (even though heat rises, because the chamber is enclosed, a lot of heat reaches the board)… I have already added a third fan to the double extruder… so wiring another fan isn’t too much of a deal…