Cant get RASPI pin to toggle

Question

Hi I am testing my new raspi pins . with the following code am able to toggle all the ports except LED3 ..pin 16 .

Is their a method to identify if the pin itself i broker or not

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
LED1 = 20
LED2 = 21
LED3 = 16
LED4 = 12



while True:

    GPIO.setup(LED1,GPIO.OUT)
    GPIO.output(LED1,True)

    GPIO.setup(LED2,GPIO.OUT)
    GPIO.output(LED2,True)

    GPIO.setup(LED3,GPIO.OUT)
    GPIO.output(LED3,True)

    GPIO.setup(LED4,GPIO.OUT)
    GPIO.output(LED4,True)

    time.sleep(1)

    GPIO.setup(LED1,GPIO.OUT)
    GPIO.output(LED1,False)

    GPIO.setup(LED2,GPIO.OUT)
    GPIO.output(LED2,False)

    GPIO.setup(LED3,GPIO.OUT)
    GPIO.output(LED3,False)

    GPIO.setup(LED4,GPIO.OUT)
    GPIO.output(LED4,False)

    time.sleep(1)

Answer 1

Software

You could use the wiringPi library(you may have to install it) as described in this question. It tests input, output, pull-up and pull-down. It will return Failed user gpios: Noneif all your pins are OK.

Hardware

Also, if it returns all clear, make sure that you are observing polarity for LED3. In other words, if you have it in the wrong way it will not work(longer lead is positive).