I accidently plugged in my 24V labelwriter cord to my hard drive and it started smoking. Some Googling led me here, and I’ve seen the replies to others on removing D4. I have not done that yet as I’m concerned with a spot on the small board, U2 (I think) that looks bad. I’m not concerned with saving the hard drive itself, but I have hundreds of dollars worth of clipart for embroidery digitizing, as well as sets digitized for a website, not mention just about all of my kid’s pictures. :( I have not tried plugging this back in, the wisps of smoke have me very, very cautious.
Small board, with the U2 in question: