One more thing: LCD0-IO3 is a GPIO (PH12). It can supply maximum 35mA-40mA, LCD consumes around 150-200mA, so, I recommend powering externally (GND Shorted) or from EXT-PORTS of Banana Pi. |
Also, Backlight consumes around 250-300mA current, which can put load on the System. Here, I recommend powering externally, as well.
Just for future reference, if you want this LCD to work flawlessly, just replicate the Circuitry on Page 3 of SOM-A10&A20_SCH.pdf (It's open source, just look for it). Make your own PCB Board. All parts utilized here are easily available.