Where did you buy it!!! There can be two alternatives... Toshiba chipset T6963C or the Samsung KS0108/7 both 20 pin pinouts... The Toshiba pinouts are almost nearly similar, The samsung however isn't... I would be looking to the negative voltage convertor ( the little surface mount chip ) google the chip and look at the application examples... Find out which pin is the output, and trace it back to the main connector..... You will be able to find the 5v rail and ground in a similar fashion.... You will be able to find out the pinout from these deductions.