Assuming you're referencing a factory head unit, it likely just means the bulbs went out in the corresponding areas. You would likely have to remove the head unit, separate the face and probably weld in new tiny LEDs as I dont believe they are removable socket bulbs. Its not worth the head ache if you're not familiar with doing such things. If its a must for you the I suggest hunting down a fully functioning OEM head unit online or take a chance at one you find in a junkyard.