In the past for trying to understand why all that noise i've moved this diabolic thing also outside the house, with no improvement. AFAIK nothing has changed, have the same things aroud (only added some instruments, nothing removed).
No battery attached.
The only thing is that now i leave the main switch on, and i use the top on/off button to turn it on. This result to have the green light powered on all the time.
Today i check if from really cold state has the noise, but in past i've already tried to leave it on without appreciable result.
If it remain in this way, i have no need to replace the smps for something less noisy, but i hate things that fix itselves, as have the tendency to broke itselves with same rapidity. I'll teardown it into little pieces