No backlight what did I do????

[Cr8zyJay]

Ok so I hard bricked my Nexus 7 and ended up buying a new main board for it. I installed the new main board and didn't think it worked because it still wouldn't power up. Or so I thought. Anyway seems that it did work because as I was putting it down I realized I could very faintly see the word Welcome on the screen. My question is what did I do wrong to make the screen so dark? There is no backlight at all. I double checked all the ribbons and they seem to be connected 100%. Is it possible the battery is just really low???

[birdastrompgman]

Cover it with a blanket, or take it into a closet.  Go into Settings > Display > Brightness, and swipe the indicator over to the right.