Just a hunch but make sure the pin connectors are hooked to the proper places on the light board. The two connectors are very similar looking and can easily be put in the wrong spot. I'm talking about the two on the right side of the light board. I've made that mistake!
Also, did you run the extra wire that came with the light board if you bought the new board verses the old one. I have a couple of old extra boards for sale if you need them. They are sold "as is"