Arduino Uno LCD 1602A i2c not showing?

Question

Arduino

Connected the display to the i2c module.
The scanner shows that i2c module is found - 0x27.
But nothing is displayed.
I took the library and the sketch from here
https://www.brainy-bits.com/connect-a-character-lc...
The display is on, but there is nothing, there are no squares either.

Answer 1

Have you tried adjusting the contrast? There pin is responsible for it.

Answer 2

address = 0x27;