Lcd backligth problem

Other Hardware Displays
1

Hello I bougt 16X2 Blue Lcd .
I write code to arduino

// include the library code:
#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
  // set up the LCD's number of columns and rows: 
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print("hello, world!");
}

void loop() {
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  lcd.setCursor(0, 1);
  // print the number of seconds since reset:
  lcd.print(millis()/1000);
}

?t's worked . But after 1 hour I try .Lcd write hello, world! , Lcd s backlight not worked .
Why backlight didnt work

2

Does it work now? Or did it only work for the first hour?
If it is now broken was there a current limiting resistor in line with the back light?
You could have burnt it out.

3

If it was an assembled shield, there are circuit layout problems with those. Google 16x2 backlight pwm and you'll probably find what I'm talking about. I just turned mine off...

Chris