I recently got an Arduino LCD screen. I tried connecting it to the UNO with the 10k potentiometer and all the needed equipment but all I got were white rectangles instead of characters. I have uploaded the hello world code but I saw no changes.

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  • 2
    Looks like you may have the contrast set (or wired) wrong.
    – Majenko
    Feb 12, 2017 at 23:16
  • Or you have drawn white rectangles to the screen. Feb 13, 2017 at 12:46

1 Answer 1


As @Majenko already mentioned, you have to set the right contrast. Use potentiometer to find out what value suits you right.

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