My screen just flickers and doesn’t change after shutdown and restart. The external screen is operating as it should. Is this possibly a cable coming loose or logic board replacement?
I appreciate any assistance of resolution.
Let me know if this is not viewable?
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@Kwin - Sorry I lost track of your problem ;-{
Sadly it does look like your T-CON board on the back side of the display assembly has failed. If you remember back in the day when we had CRT based TV’s if you messed with the horizontal setting you would see the image of the display roll like yours, once you play the video slowly! This is the same problem you are facing as the horizontal lock is not working!
Time for a new display assembly: 27” iMac Display Assembly, Apple P/N 661-7169 and here’s the guide to put it in iMac Intel 27" EMC 2639 显示器更换 Make sure you get the full kit iMac Intel 27" (2012-2019) Adhesive Strips so you get the needed tool and I would get a second set of tapes just in case! Lastly, you’ll want a pile of these (4 will do) Plastic Cards
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Probably about to die sooner rather than later...
由 ibisiki 完成的
Can you post a short video from your iPhone so we can see what's happening as that might clue us in on what needs repair or replacement. 在已经存在的问题里加入图片
There's two directions, either the backlight logic or cable is messed up or the T-CON logic which is on the back of the display assembly is messed up. Seeing the video should help us understand which.
由 Dan 完成的
@danj Thanks for your assistance, very helpful. I posted a video of the issue above on the post for your review for further diagnostic? Let me know what you think and we can go from there? Do you offer any break fix services for this machine?
Again, many thanks.
由 Kwin 完成的