This may be a stupid question, but with the non nav models is the display and the MID supposed to be blue or black? I have had the TL for a year now and have never seen a blue diplay until I picked up a brochure for the car. I am not sure if the bulbs are blown or if a fuse is blown. What color is the display supposed to be? Sorry for the ignorance.............

 

Black display.

 

Do you think that there are any ways to change the color of the background?

 

yes it's possible to change it to any color you want

if i am correct, they use either LEDs or regular bulbs to light up the displays. i know my TL, has navi and the upper display is lit by 2 LEDs

basically if you are good with a soldering gun you can remove the white LEDs and replace them with whatever color you want