I've bought used Dell precision 5530 (pre-lease) and I'm facing issue with something I found has a name "coil whining". It appears after every action on laptop (scrolling, page refresh, vides watching etc) is being made. I've been surfing the Internet/ youtube vidoes but haven't found strict response if this problem can be fixed/ limited somehow. 

Some say usage of thermal paste on CPU/GKU can help, others to replace the motherboard and others it just can't be fixed.

Can someone clarify the problem for me?