@phaedrux The 3.3V and 5V regulators appear undamaged, and I can’t see any other obvious damage. Have you checked the fuses? I notice the fan fuse is 2A, did you change that? Is you PSU definitely outputting the correct voltage?

Did not change fuse and fuses appear to be fine and unbroken.

Can't say if PSU was outputting the correct voltage but I can tell you that it worked fine for almost a month and the Bigtree board worked great for over a year that was being powered with the ender power supply.

Ok this was purchased on January 02, 2022.
It was working for almost a month with no problems.

@droftarts
Thank you for helping with this.

ORDER #77969 Filastruder

@o_lampe Yes I would like to get a replacement. Not sure about a multimeter to test though.

I have a Duet 2 wifi about a month old and I has been working great up until this morning. I turn on printer and the board did not connect to my wifi. Inspected it to make sure all connections and jumpers will good, they were. Decided to hook up usb to computer and all of a sudden, the wifi powered up. Before I only had one light on. It appears normal now. Searched the forum and this is what I came up with.
https://forum.duet3d.com/topic/13007/duet-2-wifi-only-connects-via-usb/3

I checked the 5v jumper and it is there also looked at the U3 chip and did not see any damage.