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A2115 / 2019 / Processors from 3.0 GHz 6-core i5, up to 3.6 GHz 8-core i9. Released March 19, 2019.

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White stripe of dead pixels

I just attempted an SSD upgrade on this iMac. When re-assembling, I was presented with a rather large column of dead pixels. I really hope I didn’t hurt it while removing. I was being as gentle as possible. I’ve done this before with no problem.

Also, the iMac does not want to read the SSD I put in there, but I’m calling that a second-priority issue right now.

Block Image

Does anybody know a fix for this? Or do I need to buy a $500 display?

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I’m sorry to see that you have done so well just to end up with dead pixels. I am afraid to say that your screen has been damaged in the upgrade procedure and will need to be replaced.

I really feel your pain with this one :(

Sorry I could not offer a fix :(

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Ouch! Not good ;-{

Did you use the pizza cutter which comes with the iMac Intel 27" (2012-2019) Adhesive Strips kit I also find a few sets of the Plastic Cards also help. Following this guide iMac Intel 27" Retina 5K Display 2019 디스플레이 교체 to the letter is important as its very easy to damage the display either pushing in too deep or prying while the display is not fully released.

Time for a new display sorry! 27” iMac Retina 5K Display Assembly, Apple P/N 661-12558

But let’s see if we can figure out what’s happening with the SSD which port did you put it into. Did you replace the HDD (SATA port) or did you install the new SSD in the PCI port? Which drive did you use?

Maybe we can figure this out too so you only need to go back in once to get the system back to 100%

Plastic Cards 이미지

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Plastic Cards

$2.99

iMac Intel 27" (2012-2019) Adhesive Strips 이미지

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iMac Intel 27" (2012-2019) Adhesive Strips

$19.99

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I used a razor blade around the edges to release the adhesives. It's the bottom strip that gave me trouble, it didn't want to release easily. I didn't think I forced it hard at all, but I guess the retina displays are super delicate.

As for the SSD, I've got it installed with the SATA cable. (There's a PCIe option??) I used the OWC thermal sensor. I tried bypassing the thermal sensor too, but still no dice. Data was duplicated to the drive using CCCloner.

@chedley - OK, I suspect you sliced the one of the display cables. A common issue when using a razor, your not the first. Get the pizza tool!

If you got a HD system you can add in a blade PCIe SSD following this guide iMac Intel 27" Retina 5K Display 2019 Blade SSD Replacement. A Fusion Drive system will have the blade SSD but it will be quite small and not very useful, but the OWC drives can offer some real performance improvement!

Cloning! Sadly, cloning is no longer the way! I haven't used it in over 15 years now! While it can be useful when duplicating a data drive it is useless on a boot drive, more so with APFS based macOS's.

So... Unless your original drive has a problem, I would just put it back in and get a 500GB/1TB blade SSD to give my system the zip it needs. If your drive is toast or you just need to get a bigger drive then put in what you need. but, this time just install a fresh OS from the Internet recovery option builtin your system and then using a SATA to Thunderbolt case to hold your old system drive restore it to your new drive using Apples Migration Assistant services.

I doubt I sliced any cables. Here's a pic of the maximum depth of my blade:

https://photos.app.goo.gl/n9f9PM3dGy8ZBS...

As you can see, the cables below are practically miles away. And upon close inspection, no visible damage.

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