Mine did the same, and I was sent a replacement X Stop Cable and
Board.
I measured the cable for a short, even tried flexing it, but couldn't
see a short.
I replaced it with the ones I was sent just to be sure.
I also noticed that the inverter for the RGB LED was nuked too. Not
sure if was nuked when the regulator
blew, because 24V got on the main 5V line, or if the FET took out the
inverter due to
gate capacitance. I tried replacing the regulator, but the board had
taken some pretty serious damage
when the regulator blew, even the 1280 was nuked.
If you still have the old board lying around, look around the RGB
connector to
see if the inverter is blown too.
> My understanding is that there is a potential short in the *cable *between
> the X-endstop and the board, but that the X-stop itself is actually fine.
>
> Thanks,
>
> On Tue, Aug 21, 2012 at 10:48 PM, Gary Crowell <
garyacrowel...@gmail.com>wrote:
>
>
>
>
>
>
>
>
>
> > Is there something specific about the X-endstop that can be
> > inspected/fixed to avoid the 'pop'. Is it the cable or the endstop board?
> > Is it unique to the X-stop, or is the same failure potential on the other
> > stops as well?
>
> > Gary
>
> > On Tue, Aug 21, 2012 at 7:56 AM, Martin Galese <
mar...@galese.net> wrote:
>
> >> If you heard a loud pop prior to the failure, one of the voltage
> >> regulators may have failed. I've had that happen twice now, and I'm
> >> waiting on my second MightyBoard replacement. The symptoms for me involved
> >> a dead machine with just the MightBoard cooling fan running. I think my
> >> LCD flickered some, though, not the black bars you are describing.
>
> >> According to support, they have identified a short in the X endstop cable
> >> that leads to this issue. I'm supposed to receive both a new board and a
> >> new X endstop cable shortly.
>
> >> Good luck,
>
> > Linkedin <
http://www.linkedin.com/in/garyacrowellsr> Elance<
http://www.linkedin.com/redirect?url=http%3A%2F%2Fgaryacrowellsr%2Eel...>
> > KE7FIZ <
http://www.arrl.org>