Hi all,i have a fluke 83v,it works great except recently i needed to turn on the lcd backlight as i was in poor lighting conditions,it beeps when i press the backlight button but thats it,the backlight doesent actualy turn on,i havent pulled it apart yet as been too busy,as i dont have any schematics etc i thought i would ask here,just wondered if this was a common/ known faul?,cheers in advance.