ytrewq:
I have what appears to be the same LCD 4X20 display that I want to work with my Arduino Uno, rev. 3.
http://www.amazon.com/gp/product/B003B22UR0/ref=oh_details_o00_s00_i00
I followed the reply to mssg below, which suggested searching on 'LCD sainsmart', and I did. I went through all of those messages and loaded all of the libraries. Nothing worked, and I tried fixing the device address and typos in some of them, still with no success. One of them did make the backlight flicker. I have tried wiring it with SDA/SCL to the SDA/SCL on the Uno. I also tried using A4/A5, reversing them. Nada.I wrote to wiflish to see if he ever got it to work, got no reply.
Thanks for any help.
If it's the sainsmart then try looking at the following post and report back:-