This just happened to me today! I was sitting in my office, where I keep my JBJ 28g Nano LED Intermediate, when I heard a pop as the daylight LEDs went out on my aquarium, followed immediately by a burning smell. Moon LEDs and fans still work. My tank has been running for about 2 weeks.... How long did it take to get a replacement hood? Sounds like a fairly common problem with the JBJ 28 LED Interm.