Razer Blackwidow buzzing

Hello,

I'm not sure if it was always there, or did it appear recently but there is a buzzing/electrical sound coming from my Blackwidow Ultimate 2014. The sound appears only when lighting is turned on, it appears at 1 brightness and disappears at 93. The higher the lightning level is set on, the higher frequency sound can be heard(it kinda hurts the ears). The sound is coming from right top corner - where capslock, numlock and scroll lock indicators are, there are also usb, microphone and headphones ports there(I'm not using them), maybe it's coming from them? Someone knows more about this?
It becomes slighty hearable from around 15cm.