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It's possible that the "illumination" wire is not connected or connected improperly. It's also possible that the front panel electrical connections are not making proper contact. Remove the front panel and gently clean the contacts with a pencil eraser.
Also, the CDX-C680 allows you to select either green or amber illumination. One or the other may be defective. Try changing it. Press SHIFT - press "3" (set up) three times - press "5" (right arrow) to change the setting. Also check the setting for "dimmer". ON will result in a dimmed display at all times. AUTO will dim the display whenever the headlights are turned on (if the wiring is connected properly). OFF will result in the brightest display at all times.