12864 LCD Screen Not Lighting Up

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If your 12864 LCD screen is not showing any LCD backlight (you must have firmware loaded on your board for any text to be displayed on the LCD) then rotate the cables at BOTH ENDS but only on one side (aka LCD side or board side).

If you want a longer explanation on why this is needed sometimes see our video here: https://www.youtube.com/watch?v=BPl5-psFQRc