Thanks to all that replied, much appreciated.

@dc42

Thank you for replying so quickly. The SD card appears to be completely dead. Nothing on the board heats up when it's powered but from what you say it looks like my slip may have been terminal. I may try to replace the regulator and u11 later and try my luck. I've ordered a replacement Duet, and learned a painful lesson.

New user here. Experienced with Prusa machines, and RAMPS based printers. New to Duet. Building a Hypercube Evolution with Duet WiFi.

Herewith a tale of woe, and a request for info and assist.

While wiring up my Duet I managed to make two fairly disastrous mistakes on two separate days. Firstly I connected in two expensive Noctua fans for hotend and print fan and managed to burn out both. I had 5v fans and my Duet came with the fan voltage header set to Vin which in my case is 24v. Two brand new Noctua's ruined. Thoroughly disappointed in myself when I figured out what I had done. Set the fan jumper to 5v and paid out for two more Noctua's.

Today the new Noctua's arrived. Having been once bitten I powered up the Duet and grabbed my meter to make doubly sure there was only 5v on the fan headers, before I connected the new Noctua's. Disaster struck. I had just registered 5v on the meter when I received a text message. Instinctively I glanced at my phone and one of my meter probes slipped slightly. Instantly there was a slight spit and a wisp of magic smoke. I shut off the power and removed the Duet from the HEVO.

Clearly I have killed the board. When powered on the 3.3v LED remains off, so does the wifi chip blue LED. Looks like I may have killed the 3.3v circuit. Examination under the magnifier reveals two areas of damage, what looks like a converter and a 14 leg IC.

I have highlighted the two visibly damaged items in red. Can anyone confirm what damage I have caused, and is it going to be possible to get this board repaired?

Thanks in advance!