I'm using LCD QC1602A with a 10k potentiometer and changing contrast. It works well but the problem is that no text is appearing.
I'm using the LCD hello world examples and a few other examples. I tried reconnecting wires at least 5 times but every time it's the same problem. I connected it like this but the screen is not displaying any text at any contrast.
PS: It was showing white squares only in the top row, and now it's in both rows.