head unit display question

hey everyone. i bought the 6 cd changer from a guy on this forum and after i put it in i realized that the display doesn't light up at night like it should. the rest of the buttons illuminate just fine, just not the actual display. it is extremely annoying. i have to turn on the interior light to see what track i'm playing. does anyone know what could be wrong? is there a separate bulb in there for the display alone? it can't be the wire connection because they all go in together with that clip on the back of the unit. any suggestions would be appreciated.
 
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