I have a DMC20481 lcd display and I wanted to connect it to my arduino, and it didn’t work. Then I connected my other 16x2 display (qapass 1602a) to the exact same wiring and code and it did work.
I connected everything to the schematic you can download, and the only thing I did when swapping was lcd.begin(16, 2); to lcd.begin(20, 4);.
I know the DMC20481 once did it correctly because my dad connected it once when I was 12 and he also doesn’t know how to connect it now.
I tried an older version of lcd library, reconnecting the wires with more wires (all of the lcd connections are connected), another arduino, another lcd (16x2 and it did work) and the default program coming with the library but this is the closest I get to display something on this 20x4 lcd.
Does anyone know what to do and display useful characters on this display?