When the tv has been on a while dark areas start appearing across the middle of the screen like large ink smudges or shadows, they are not a regular shape and are approx 2 to 3 inches vertical by 6 inches horizontal. the screen is clear when tv is first turned on.
Do the smudges move around or are they in the same position all the time??If they appear in the same position it sounds like you are having a problem with the invertor panel or the back light circuitry.If you could post photo of fault would be helpfull
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dark spot could be a faulty led. if you put a program on that is in white screen you should see all the leds light up the screen. dark spot will be were the led is not working. if on white screen and they all lite up but still dark around the area, it could be the lcd screen. and could be dying pixels. and try this video https://youtu.be/wlA2rcrAOCs
If you suddenly noticed it, this is most likely caused by a large piece of dust on the lens. It is hard to clean, you would need to take the whole TV apart in order to get to the lens (mounted on the optical block).
It could also be caused by a failure of the optical block, which had inherent issues. There is a pending class action law suit against Sony for problems with optical block that include smudges, hazes, and tints that appear after a certain number of hours.
Other causes could be a dirty portion of the mirror or a smudge on the inside part of the screen but these are rare because dust and contaminants do not usually accumulate on these parts of the TV.