DS Lite Powers on, but no Display

I had two broken DS Lites, one with and issue pertaining to the ribbon cable connectors, and one with the top screen falling off. I swapped out the first ones motherboard with one that I assume to be working, and that got me to the point where the bottom screen would flash white momentarily before the unit powers off. I read on another person's question that their DS worked after removing the wifi board, so I decided that it was worth a shot. After removing it, it remains turned on, but both screens are dead, no flashes or anything. This is both with and without a game.