Panasonic datasheets are really tough to find as they are usually only available in Japanese, however I have a a paper copy of an old Japanese databook for some Panasonic LCD panels (but it doesn't list this particular model).
Most of these displays share a common pinout, going from the other displays the most common configuration for connectors with the same number of pins is this...
5 pin power connector.
1 - Vi (12v) Display Power
2 - GND (Vi)
3 - GND (Vbl)
4 - GND (Vbl)
5 - Vbl (12v) Backlight Power
You need to link the ground pins yourself as there is no internal connection between the ground pins for Vi and Vbl. The datasheet also recommends fitting a pair of 100uF capacitors as near as possible to the power connector (one between Vi and it's GND pin and one for Vbl).
9 Pin signal connector.
1 - GND
2 - GND
3 - Red
4 - Green
5 - Blue
6 - Sync
7 - Sync GND
8 - GND / display switching (depending on model)
9 - GND
Signal timing depends on the display model. Most smaller resolution displays need NTSC video timing, larger ones are VGA/SVGA.
I can't be certain if these pinouts are the right ones for your display. I'd suggest that you use a multimeter to check the resistance of the connections before powering up the display. The ground pins on the signal connector should be connected together in the display and the R,G,B connections should measure around 75 ohms to one of the ground pins. Then apply power to the Vbl pins to see if the backlight comes on, and finally power up the whole display if everything else checks out.
If someone can find a pachislo machine that uses this model display, then a quick check of the voltage going to the display power connector would be a great help in checking if this information is accurate.