I backlit my DMG Gameboy and everything is functional. Light, screen, bivert module. However, the buttons seemed to be screwed up and I do not know how to fix it. All the buttons serve their intended function, but the A button and the Select button. When I was testing the Gameboy, with Mega Man Xtreme, the A button which functions as Jump for that game would jump AND bring up the item screen, which you access with the select button. What I'm saying is, when I press A, it also "presses" the Select button.
EDIT: Sorry for the false alarm, there was some solder on the circuit board messing up the signals. It's working properly now.