Hi, I got this 20x4 LCD display a few days ago, but I can't get it to show anything other than two rows of squares, on row 1 and 3. I have checked and redone the wiring a few times and tested the soldering conections, which all seem to work fine. I have a potmeter connected to pin 3, the 2 images…

2 rows of black sqares on 20x4 LCD

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