I2C LCD Serial Interface Board not displaying text

Question

The code dont gives error, but not displays "Hello World"

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
// Set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27, 16, 2);
void setup() {
 // initialize the LCD
 lcd.begin();
 // Turn on the blacklight and print a message.
 lcd.backlight();
 lcd.print("Hello, world!");
}
void loop() {
}

• Majenko: Are you sure you have the same display as that library is designed for?

Answer 1

This can be due a lot of reasons, among:

Most common:

• Backlight is set too low (there should be a small dial)
• Circuit problem (recheck), and post it.
• The I2C address is wrong, there are sketches to check it.

Less common:

• Broken LCD
• Broken Arduino
• No power on Arduino (check LED)