I actually backlit my GBA a few years back. Its awesome! And requires little effort. I bought a ribon cable from a guy in Hong Kong and it converts the GBA SP screen Ribon to GBA board connector. There is 1 word that needs to be soldered to the board for power as well as minor case cutting to fit the slightly larger GBA SP screen in it. Well worth the time spent. Only select GBA boards support this and they start with 10-x-x. The price of this mod is a backlit so screen and about 50.00 for the ribon cable adapter.