If you are not sure, check the label on the back of the GBA SP and it will be listed in the top left corner. If you have an ags-001, which is the launch model, it is frontlit as opposed to the ags-101 model which is backlit. I have a GBA SP Special Pikachu Edition that I got for my birthday in 2005 and I have never had this problem. I also have
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gameboy advance sp ags 101