Quote Originally Posted by spitfiredriver View Post
As it has a HD44780 compatible controller and a standard pinout I hoped it would be a positive V0 for contrast but that might be the problem. The only markings on the display are the pinout and (ELECTROLITE QY-162A)
Most HD44780 LCD units, pin 3 contrast is at or very near ground, I usually just ground pins 1,3,5