I have never moved any of the connectors while it was plugged in. I unplug it each time I make a change, but perhaps some caps were still charged? But now I have 3 boards with no X axis movement. 2 OEM and a Geeetech replacement. They all worked with my config for about 2 - 30 minutes. They all failed after my calibrations but before I could print anything. If I put the X connector on the Y axis header it works (and the Y axis then does not work). It sure sounds like a bad stepper driver but what would cause 3 of them to blow out so quickly? I was told the OEM boards were pre-calibrated for the VREF. I checked it on the Geeetech board before I ever connected a single thing. I started it at 1v and worked up to about 1.2. That was working fine even when a little torque was required. The wiki mentions 2v VREF, which I thought was a bit much to start. I have a suspicion it is the stepper motor itself.
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