basically i was doing the composite mod to my megadrive and i had my laptop power adapter on the floor next to the md adapter and i plugged the laptop adapter in instead of the md
. the laptop adapter is 19v and 4a. i turned the md on and after nothing onscreen for about 10 sec i heard a pop i have gone around the mobo with a multimeter but can't find the problem component. what would be a good place to start and what could have made the "pop'. both voltage regulators are getting extremely hot so i am assuming they are functioning but i have no idea.