Rebuilding a project BSD and a few seconds after power up the Sound board sizzled, sparks then a small drift of smoke before I had time to reach down and switch the power off.

On closer inspection I found C46 has blown as shown in the photo. Any ideas what might have caused this?

Lower cabinet speaker was unplugged at the time. Rest of the game appeared to boot fine.

The board was supposedly ok, but was untested by me. I have another in a working game, but don't want to install that until I can be sure it's not related to this machine. Supply voltages to the sound board all checkout ok.
20200813_163116 (resized).jpg

Ok, I'll give that a try, thanks. Anyone have a list of which caps to replace on this board?

Just had another look and my aging eyes let me down, it was C46 that blew, not C45 as originally stated in the 1st post. That's been edited now.

Looks like there are two types of tantalum caps as listed in the manual. 1uf and 10 uf. Will have to order some.

Screenshot_20200813-182654 (resized).jpg

Will do, thanks for your help! Hopefully nothing else on the board was damaged.