I was testing out whether my 16x2 LCD works. I hooked it up to the arduino.
Some white box appeared which probably meant it works fine, but the box and the blue background looked very dim even when the potentiometer was turned to the maximum, and did not have the bright blue background which I saw on google.
FYI I soldered copper wire on the LCD and shoved them onto the breadboard since I did not have any pin headers. Would this be a cause of the problem?