In my case, the monitor was fine for the first two months. But then started making a buzzing noise… 1) when on, 2) worse when in power stand-by mode, and 3) even worse when turned off.
It seems as if the cheap capacitors manufacturers’ use in these LCDs, after a while, start to resonate at a high pitch frequency that is very annoying in a quiet room. I’ve read that some people have fixed this by opening up the monitor and putting epoxy resin around parts … something I was not ready to do.
Adjusting the brightness setting of the LCD managed to fix this problem. Since this changes the power the monitor takes, this also changes the frequency these cheap capacitors resonate at… Sometimes for the better. You’ll have to play around and see what works for you best.
Next time I’m going for a nice non-TN Samsung.
Other reported fixes include changing the refresh rate (switching between 50Hz or 60Hz), and disabling the internal/integrated speakers or setting their volume to zero (they might be on without you knowing).