1. Check the fuse. The radio display is powered by a fuse, so if the fuse is blown, the display will not work. The fuse for the radio is located in the fuse box under the hood of the vehicle. Check the fuse and if blown replace it before moving to other steps.
2. Check the wiring. If the fuse is not blown, then the next thing to check is the wiring. There are several wires that connect the radio to the display, and if any of these wires are loose or damaged, the display will not work. Check all of the wires and make sure they are properly connected.
3. Check the display. If the fuse and wiring are both good, then the problem is likely with the display itself. The display is a vacuum fluorescent display (VFD), and if the VFD is damaged, the display will not work. You can try to repair the VFD, but it is a delicate process and it is easy to damage the VFD if you are not careful.
4. Replace the radio. If you are not able to repair the VFD, then you will need to replace the radio. You can purchase a new radio from a Ford dealership or from an online retailer. When you install the new radio, be sure to connect all of the wires properly.
5. Update your firmware. If you have done all of the previous steps and the display still does not work, check your vehicle information, and if available on your model consult the owner's manual for how to perform a firmware update. Updates can fix any display issues.