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Any chance light could be leaking around your lens cap? What if you repeat this test, but holding your camera under dark towels or coats or something, and maybe with the room light off? Not sure your sensor isn't damaged, but I'm having a hard time imagining sensor damage that would look like THAT.

Assuming still photography of a general nature; Aperture priority, set aperture to F8 or F5.6 ISO set to Auto ISO, range base to 6400, minimum shutter speed 1/100 sec Viewfinder screen set to show picture effect/exposure, histogram, blinking highlights and exposure information Focus set to AF-S with single point or area with 9 points Go out, make photos, see what's working and what's not, adjust to your own liking and use case.