Duetwifi+Duex2 Issues

RandomFactoid

Hi,

I i have been using my Duet Wifi on a delta for a while and recently moved it onto a new project (Voron2). I also had an unused Duex2 laying around which I wired up to the Voron2 as it uses >9000 steppers
I am not sure at what point it happened - whether some of the issues were there beforehand, however I am now facing a couple of them.

The fan/led output pins on the duex2 are producing 8.5v instead of 12v as chosen with the jumper. Similarly, choosing VIN with the jumper gives a voltage of ~20.8v (main supply is 24v). For comparison 'Always on fan' pins are getting 24v.
At some point after connecting an inductive probe (PN-08N) I found it to be non-functional...and eventually found it to be fried. Not sure at what point it happened. Interestingly, I think since that time my paneldue has been playing up. The buttons work as intended (eg homing, moving), however i am not getting any temperatures or other info on it.

All the steppers are working as intended btw.

Any clue where to start troubleshooting ? I suspect something's fried...just not sure where to start looking. I couldn't see anything obviously fried on the boards...but perhaps I didn't look in the right spots.

Any help is very much appreciated (got some time while waiting for a new inductive sensor ).

Some closeup pics of the boards (for versions, etc..) are here: https://photos.app.goo.gl/vSRK532aHwkHWrEa6

Thanks!

T3P3Tony

@randomfactoid when taking those test voltages do you have anything else plugged into the Duex2 fan/led outputs?

RandomFactoid

Thanks for replying
@T3P3Tony I only had part cooling fan wires plugged in, however those didn't have an actual fan connected. So that's a no

RandomFactoid

Update:

Apparently 8.5v is only on Fan3 terminal. Fan 4-7 is actually just below 12v which is acceptable.
Paneldue issue resolved. Found a bad wire in going from paneldue to the board.

I guess this can be marked as Resolved Unless someone have ideas why only Fan/Led3 is doing that

Thanks

dc42

I suspect that the fan 3 mosfet has failed with a gate-drain short.