Hello,
I've just noticed some really weird dark patches in both lower corners of my 4K iMac (late 2015). I don't normally have anything open full-screen - I normally scatter small windows across the screen - so I can't say whether these have suddenly appeared or if they've slowly appeared over time.
I've never seen anything like this before. If I move any content over it (text, graphics etc), it looks like the dark patches are a few millimetres behind the display. It's like there's some sort of dust or smoke between the backlight and the LCD.
I'll be honest - if I saw something like this on somebody's phone, I'd assume it was liquid damage or pressure. But this is an iMac that's been sitting on my desk for 18 months with no liquid or smoke anywhere nearby. It's not like there's any air-holes in the back that could've sucked in dust at those corners.
I've got it booked into the Apple Store on Saturday, and I've got the 3 year educational warranty, so it should be fixable. But it's really weird. Has anyone seen anything like this?
I've just noticed some really weird dark patches in both lower corners of my 4K iMac (late 2015). I don't normally have anything open full-screen - I normally scatter small windows across the screen - so I can't say whether these have suddenly appeared or if they've slowly appeared over time.
I've never seen anything like this before. If I move any content over it (text, graphics etc), it looks like the dark patches are a few millimetres behind the display. It's like there's some sort of dust or smoke between the backlight and the LCD.
I'll be honest - if I saw something like this on somebody's phone, I'd assume it was liquid damage or pressure. But this is an iMac that's been sitting on my desk for 18 months with no liquid or smoke anywhere nearby. It's not like there's any air-holes in the back that could've sucked in dust at those corners.
I've got it booked into the Apple Store on Saturday, and I've got the 3 year educational warranty, so it should be fixable. But it's really weird. Has anyone seen anything like this?

