Black Screen has Blue lines on boot up that actually move around..

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iMac Intel 27" Retina 5K Display (Late 2014 & 2015)

모델 A1419 / EMC 2806 / Late 2014 또는 Mid 2015. 3.3 또는 3.5 GHz Core i5 또는 4.0 GHz Core i7 (ID iMac15,1); EMC 2834 late 2015 / 3.3 또는 3.5 GHz Core i5 또는 4.0 GHz Core i7 (iMac17,1) 모두 Retina 5K 화면 장착

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Mark Williams @markwillia62107

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게시일: 2019년 4월 22일

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Black Screen has Blue lines on boot up that actually move around..

Pic below shows black screen on boot up, very quickly, then blue lines fade in and out, and eventually disappear, moving track pad brings them back, then disappear etc… No fan, no noise except initial mac boot sound… Any ideas?

답변되었습니다! 답변 보기 저도 같은 문제를 겪고 있습니다

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Dan @danj

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게시일: 2019년 4월 22일

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So you never see a viable desktop correct? If that’s the case your display assembly is damaged. On the backside of the assembly is a circuit board (T-CON). If you look at Steps 5&6 in the iMac Intel 27" Retina 5K Display Teardown you can see what I’m talking about.

What can happen is in the process of taking the display off you can damage the ribbon cables leading to the display. Sadly its time for a new display assembly Ouch!

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correct no desktop...on the apple BETA OSX if that could be issue, brightness works...bottom right hot corner still set to sleep...cant see cursor tho, just thrown the mouse gesture to that corner to see if it still responds....really strange though...almost like the aurora borealis lights....the blues shift all over vertically, then eventually settles to the black screen, and keystroke or trackpad movement brings back the colors then they fade into the night....going to blkscreen...

Mark Williams 의 2019년 4월 22일

Was the display taken off to service the system? If it was was the screen working at that point?

Was the screen working before you installed the Beta version of MacOS and which one? The current developers release or the open beta release?

Dan 의 2019년 4월 23일

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correct no desktop...on the apple BETA OSX if that could be issue, brightness works...bottom right hot corner still set to sleep...cant see cursor tho, just thrown the mouse gesture to that corner to see if it still responds....really strange though...almost like the aurora borealis lights....the blues shift all over vertically, then eventually settles to the black screen, and keystroke or trackpad movement brings back the colors then they fade into the night....going to blkscreen... — Mark Williams
Was the display taken off to service the system? If it was was the screen working at that point?

Was the screen working before you installed the Beta version of MacOS and which one? The current developers release or the open beta release? — Dan

iMac Intel 27" Retina 5K Display (Late 2014 & 2015)

Black Screen has Blue lines on boot up that actually move around..

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