The V5 has a I2C header that is labled -, +, scl, and sca. If you go from the LCD header and match lables, It will not work. It looks like the Sca and Scl go to A4 and A5. To get it to function you have to connect Sca and Scl to the Arduino Scl and sca pins. Once this is done it works great. Very nice display. **broken link removed**