Planted Tank Guru
Join Date: Jul 2010
Location: Huntington Beach, CA, USA
It hard to tell from the overhead picture but did the bigger capacitor at the right of the damaged area split so that it spewed the contents? Some electronic designs put that type of capacitor inside a shield so that there is less damage to the board but that is usually on high end stuff that somebody might expect to repair. It would not be worthwhile on something of this price. That would explain the size of the burned area but just looking at the outside of the casing, it would look like things worked as they should.
It would be great if things never failed but when they do it is good to see that the safety measures are working. Depending on what component breaks down, it is not unusual for several items in a row to burn. Why they fail is always an open question but power surges or low voltage can do strange things. Putting things in metal cases is one way to help keep fire from spreading. That computer tower beside you may have a metal cover for several reasons. While it is scary to think that we are keeping this much danger so close, most of us would not want to go long without electricity.
If we wanted to live hazard free, we would never ride in a car.