PSU Tripping when Powering on Printer, Possible Stuck Mosfet

[Superbrain8]

Good Morning Folks,

Got my hands on a Duet 3 6HC and a Duet 3 3HC earlier this week and had time to wire it up yesterday.

Vin is a 24V 200W Meanwell PSU
5V is externaly powered over a Meanwell 5V PSU
VIN Out0 is not connected.

Running on 3.5.0-RC2

Powered it up this morning to verify everything where right.
Overall no issues, no Sparks.
After attempting a PID tune on the Hotend the PSU tripped.
powering down the printer and having it sit unpowered for a bit caused it to power on again.

After some digging the PSU tripped again but since then Printer refuses to power on again.
Removing any load from the PSU gets it to start.
Just having the 3HC connected works also fine.
Removing any plugged in Device from the 6HC and powering it over 24V trips the PSU
just powering it on 24V without 5V showed a slight glow on the Out3 Status LED

Im somewhat in a lucky Position in owning a Thermal Camera and ive took a Video of the Mosfet for Out3
Xinf_231231_094202_924.mp4

[Superbrain8]

After some more digging around its only the Mosfet that gets Hot the Zenner Diode for the header too.
in the Attached video you can see the Mosfet pulsing from the PSU resetting from the Overcurrent protection and tripping again
measured reistance on the header is about 1 Ohm the header below about 1 MOhm

[Superbrain8]

Is there a chance to get the board RMAd?
bought it 23.12.2023, arrived the 28th from Dold-Mechatronik

[Phaedrux]

Please send an email to warranty@duet3d.com and CC your reseller. Include a link to this forum thread and the details of your original purchase. You'll receive a reply with a form to fill out.