When I switch on my Panasonic Lumix DMC-G85, there is a distinct (albeit faint) sound coming from inside the camera body. To me, it sounds like a small fan, not too dissimilar from what you'd find inside a laptop body. Considering the camera is constantly active, showing frames either on the eye socket or the screen, and it handles 4k video, it wouldn't surprise me if it needed some active cooling.
Question: Does the G85 have an internal fan? If not, what exactly is the constant sound that I'm hearing come from the inside of the camera body?
Others have theorized that it's related to the in-body image stabilization (IBIS), although I struggle to see how such a component could create so much constant noise (again, it's not that loud, just noticeable).
I have to put my ear up to the camera body in order to hear the sound, so this isn't a complaint. I'm just trying to learn a little about the internals of the camera body.