H/AC Board Issues - Backlight Soldering
 

I was replacing a burnt out light in my H/AC panel. I got the old one out and soldered the new one in. Now? Now when I plug it back in, the only light that works is the one I replaced. Any thoughts? And I made sure the two prongs are not touching on the backside, so I don't think it's that. Anything else to watch out for?