To test if infrared LED (Flash) is firing at night set up on the dark and use a cell phone camera looking at the LEDS - you should see a glow (cant see with naked eye if black flash out of spectrum of human eye) if not the fault could be that.
2nd if you look into the camera port you may see a slightly pinkish looking lenses, this is a day light color filter to give color to images etc... at night this IR filter should move out the way to allow the camera to pick up Infrared better. Sometimes these are mechanical moved other times cameras may not have one. This too can be faulty as its a moving part and requires signal to a electro magnet to move it. Check that this is operational. (pink covered in day and gone at night)
The way it knows to choose an IR or day photo is determined by a light sensor on the front of the camera. The camera looks for amount of light and if too low will stitch to the infrared (black and white) pictures and fire the Night LEDs. So be careful at night when using a torch or light source to test as you could fool it into thinking its day ha ha.
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