Identify a fried capacitor
Its looks like CX or CY typically applied in between L and N or L and gnd or N and gnd. The gnd is the low voltage side of the power supply. 

Normally these caps are purposed for electromagnetic noise suppression. They do this by provide very low impedance path for very high frequency harmonic noise so that these noise are diverted away from sensitive electronics. 

What is important for you to note when replacing these capacitor are simply the capacitance value (100pF) and their voltage rating (2000V). 

For the repairing you are trying to do, pls do check all semiconductor components around the area because most of the time, these will go bad too, especially the high voltage switching IC.