I´ve got recently a shield LCD 1602A with PCF8574AT attached for my Arduino UNO and it doesn´t work.
I´ve tried with several sketchs for this shield and nothing happend.
The LCD issue and Arduino are completely new for me. I don´t know how a LCD works and his PCF8574AT attached. I should need some help to run the LCD 1602A with PCF8574AT attached. Also I should need some manual about how to manage these kind of LCD displays and Arduino (how to address the LCD, its memory and so on).