Flicker Control

    There is a screw on the GBA that controls how much voltage is sent to the screen. It is located behind the label on the back of the GBA. Adjusting the screw will make the screen brighter ,but it may fry the screen if moved too much and will definitely void your warranty. If your screen is really dark and flickers a bit, an authorized Nintendo repair center may adjust the screw for you, and it won't ruin your warranty.