Greetings!
I have a power supply that made a sound when I first plugged it in for a second then died and won't do anything now. When I cracked it open I saw that a 400v wire was touching the ungrounded heat sink that is attached to two TO-220 13005 transistors. I was curious if this could have possibly fried anything or if there is enough electrical isolation between the transistor internals and the heat sink to protect it from getting zapped like this.
I have a power supply that made a sound when I first plugged it in for a second then died and won't do anything now. When I cracked it open I saw that a 400v wire was touching the ungrounded heat sink that is attached to two TO-220 13005 transistors. I was curious if this could have possibly fried anything or if there is enough electrical isolation between the transistor internals and the heat sink to protect it from getting zapped like this.