Sorry, i meant GND. But i've see on the guide the same initialization with a single row of 'black' blocks.
That's before the initialization. It's before the Arduino is even connected to the LCD module.
You have connected a resistance of 4.7k between vcc and +LEDs pin?
Can you explain me how i can slow software? I need to change parameters in the liquidcrystal library?
Don't waste your time by tinkering with the software. You most likely have an improper connection.
Your photographs are not very helpful because there is no single picture where I can trace the wires between your Arduino and your LCD module.
How about dealing with this problem?
Don