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  • Gordon, it seems the pins caused it.
    Just changed it to I2C3 and this works:

    function onInit() {
      I2C3.setup({scl:A8, sda:B4});
      var lcd = require("HD44780").connectI2C(I2C3);
      lcd.clear();
      lcd.print( "Hello World!" );
    }
    

    No delay needed. Just different pins.

    Thanks for the hint.

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