This post is for anyone who might order and then find that the LCD screen does not display any text. The product is not defective. The problem is likely that the contrast has not been adjusted.

On the LCD screen in the top left corner there is a screw (on top of the blue box), this adjust the display contrast, turn it (a lot) eventually you should see the text on the screen, adjust to your liking.

Hope this post helps someone out!