This repair guide will take you through all the steps for removing the outer case of the Sega Genesis.
Remove the six screws from the underside of the console with a Phillips #1 screwdriver.
Flip the Sega Genesis upright.
Gently lift the top casing.
Bend out the LED leads into vertical positions.
Slide the LED wire apparatus off the lead pins.
Separate the main board from the outer case.