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My suspicion are the ir filter lens is stuck down (day mode) if ir leds flashing then it should at least make 5 meters

Forgot to say if the IR filter lense is the issue you can remove but day pictures will lack color and look more grey. easy fix for those who do not know how to repair electronics.

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...