LG 29uc88 low-frequency squeak, what's the matter?

Question

LG

Good evening.
I bought a Lg 29uc88 monitor after some time noticed that it emits a strong low-frequency squeak under certain conditions. And the conditions are different. For example, the main page eu.battle.net/ru , if you go to it and open it in full screen, a squeak appears, if you minimize the browser, and then open it again, there is no squeak. I noticed that the squeak appears due to some dark areas in the picture. The squeak is removed as soon as I hide the picture from the screen, when I return the picture, the squeak may or may not appear.
The monitor is connected via displayport cable v1.3 to the video card asus strix gtx970.
I changed the displayport to hdmi (1.4) cable that came with the monitor. The squeak began to appear less frequently, but it is still there.
The problem is not so big, there are very few situations when a squeak appears, but still I wonder why it appears.

Answer 1

If the monitor is several years old, take it to the repair shop (or solder it yourself, if you can). Failed capacitors in the power supply. Standard cheap breakdown, in Kyiv $ 30 (give or take). If the glitch is repeated through force - write down on the flash drive the picture where this goodness manifests itself.
If new - poke the service center with your nose into the problem. Obviously, the feeder was made without a reserve - and due to manufacturing defects, somewhere something was missing in terms of parameters, and it began to squeak.