unfortunately that site doesn't have the pinout for the nl6448ac20-02

even nec doesn't have the datasheet for the thing....hmm maybe they emailed me about the datasheet hehe.
as far as powering your display goes, you need to put +5v on pins 28 and 29, and hook the power supply ground to pins 31 (normal scan direction), 26, 1, 5, 12, 19. or, from what the pdf says, you can just hook your ground to the display case and pin 31 to achieve the same result.
as far as your inverter goes (this is powered seperately from the display), pins 1 and 2 are for vcc (5v), 3 and 4 are for ground, and pin 5 u can tie to +5v in order to drive the backlight @ 100% brightness. (these specs are all for the 5 pin connector w/ the red/orange wires comin outta the board, labeled CN1) according to the pdf there is also a 3 pin connector on the inverter board someplace, although i don't c it in the picture. so anyways, if ur inverter has this connector (CN3), pin 1 should be tied to +5v (turn the backlight on), and then if you want variable backlight brightness, you hafta remove the +5v from pin 5 of the other connector (don't connect it to anything), and put a 10k pot across pins 2 and 3 of the 3 pin connector.
all ya gotta do now is hook the cold cathode tube wires to the high voltage connector on the inverter (hiding under the white plastic junk), and ur good 2 go. hope this helps.