Both screens flash, then turn off

I'm attempting a shell swap on a DS Lite, I tore down the whole thing and now I'm trying to do a final power on test before putting the last few pieces together. When I put a known good battery in it and flick the power switch, the green power light comes on for a couple seconds, both screens flash white, then light briefly turns red before the device shuts off.

Both are new screens, and I tested with the old top LCD and had the same thing happen.

When I initially put this back together, I didn't realize I needed to insulate the rear of the bottom LCD and blew the F2 fuse. Today I replaced that fuse with a new one using a hot air station, so I'm worried something else might have been broken in that process. Before the fuse blew I was able to power on with both screens like normal. At this point I've triple checked all the ribbon cables, I've reseated the wifi module a couple times, and confirmed that the DS charges fine and the battery I'm using works fine in another working DS.

Given that both screens flash, I don't believe this is a connection issue with a ribbon cable. I couldn't find anyone else that had this exact issue so I'm a bit stumped now.

Thanks in advance, any advice is appreciated.