Board with blown MOV
Closeup of failed MOV
The burned part shown appears to be a MOV (Metal-oxide Varistor). The purpose of a MOV is to have a very high resistance until a certain voltage is reached at which point it will conduct current, in this case from “Hot” to “Neutral.” This property is useful for surge protectors. Original poster says this UPS was involved in an electrical fire. Credit:
A simple analog sequencer referred to as a baby 10 (step) sequencer is shown with a ICM7555IPA 555 timer cracked down the middle. Credit:
The ADC for this oscilloscope is cracked and malfunctioning – only the upper 4 bits work. The screws shown that hold the heatsink on the reverse side of the board were loose and probably caused it to overheat and eventually crack. Credit: http://www.flickr.com/photos/imager/ / CC BY-NC 2.0
Resistor was turned into a dipole antenna and coupled to the parts seen. They were destroyed when brought near a 40-50W radio transmitter. Credit: http://www.kevtris.org/