LCD LiquidCrystal_I2C

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
void setup()
{
  lcd.init();
  lcd.noBacklight();
  lcd.noBlink();
}
void loop()
{
    lcd.clear();
    lcd.backlight();
    lcd.display();
    lcd.setCursor(1, 0);
    lcd.print("!WARRING! C:");
    lcd.setCursor(0, 1);
    String t2 = "1132334";
    lcd.print(t2);
    //lcd.noBacklight();  //배경 빛 제거
    //lcd.clear();   //초기화
    //lcd.noDisplay(); //출력 안함
}