Shorted 12v Header on duex5, now 14v - 20v
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I shorted the 12v connector of my duex5 and now got 14v - 20v (depending on the load in the 12v rail) when the internal 12v Regulator is enabled.
How can i fix this issue?
Could a destroyed Diode D7 cause this behavior? -
Okay,things progress...
Today one condensator of my system-fans exploded, because i ran it with a higher voltage than it was rated for.Very loud, when standing right next to them exploding.
Now, this one fan output of my duex5 does not work anymore.
Measuring the two Sides of the Diode D15 results in 10.8v when fan should be off and 7.9 when on.
Should i take a replacement of this diode into consideration?
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@wildblue said in Shorted 12v Header on duex5, now 14v - 20v:
Okay,things progress...
Today one condensator of my system-fans exploded, because i ran it with a higher voltage than it was rated for.Very loud, when standing right next to them exploding.
Now, this one fan output of my duex5 does not work anymore.
Measuring the two Sides of the Diode D15 results in 10.8v when fan should be off and 7.9 when on.
Should i take a replacement of this diode into consideration?
No, it will be the mosfet that has failed.
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Hello dc42,
How could i verify your argument regarding the fan output with my multimeter?What do you think of my issue with the 12V rail? I currently have no idea how to fix this...
Maybe someone else other than me and the ultimate god of duet3d developers could take a quick look in the circuit diagramm of the Duex5 and connect my measuring results with some reason of them happening.
Or maybe you are just the kind of swarm-bee with knowledge of electronic things and the ability to point people other than you in the right direction? Stop hiding, start to participate in resolving this issue. Show me your bee-skills...
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See here for some guidance on testing your mosfet
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@wildblue said in Shorted 12v Header on duex5, now 14v - 20v:
How could i verify your argument regarding the fan output with my multimeter?
Check whether there is a short circuit between the gate and drain terminals.
What do you think of my issue with the 12V rail? I currently have no idea how to fix this...
If that's what you get when nothing else is connected to that 12V rail (i.e. no fans) except for the load that you test with, then it may be that the A4403 12V regulator chip has failed.
