I've done some more testing but still looking for the problem. I used a 9V battery and some wire to verify polarity on all of the LEDs and they are all installed correctly. What's throwing me off is that power is applied to the first board and that's the one that's not working. The solder on the capacitor on the side that doesn't work isn't done well (cap is loose), working on fixing that now, could that cause an issue like this?