Power Supply (COV33697901) from LG 50UH5500 (or 50UH5530) is buzzing/humming

[Pioneerx01]

I got this TV fully operational and all is working fine. The PSU (transformer) on the other hand is making noises that are quite audible, even with back cover on.

Image of PSU courtesy of ShopJimmy.

Video with sound of the issue.

Any thoughts on what can be causing this?