First post, by athlon_p0wer
I've been tinkering around with old computers for years now, and I've never had a computer component smoke on me. It startled me quite a bit, and I unplugged the thing as fast as I could but the damage was already done.
The sound card started quietly crackling and shot out a fair bit of black smoke, making the living room smell strongly of ozone. I'm assuming this was my fault, as this was in the 486 system I modified in 2019. Long story short, one of the things I did involved slicing the riser card completely in half, sanding down the cut edge, and covering it with contact adhesive to seal it. I made sure that none of the traces were still sticking out and touching, but I must have made a mistake somewhere.
The Sound Blaster Vibra 16S I used in it for years has some missing pins on the edge connector, and my theory is that most of the traces in the riser card were okay, with just one or more shorted ones on the pins that never got used. The moment I put in the Yamaha YMF-718s, which uses all the pins, and turned it on, the shorted pins were used, and this was the result:
Oddly enough, there was no damage on the motherboard anywhere. Once I removed the sound card, I double checked and made sure that black was to black on the AT power input, and that everything was hooked up right before I turned it back on, and it worked. It wasn't so smart to turn it right back on after it had just got done smoking, but I was panicking a little and wanted to know just how bad off it was or wasn't.
In retrospect, I should've left the thing alone. It probably wouldn't have done this otherwise, and the only thing wrong with the case it was made for was a broken corner piece of plastic.