Hello John and Dan I’ve unwittingly stumbled into this issue too, after upgrading the drives in my Late 2015 iMac. I put in a WD Black drive and it is recognised and works fine, until waking up from sleep when the kernel panic occurs. Can you recommend a 500GB blade that would work with the slower motherboard? Or if I put the WD drive in an external enclosure would that get round the issue, or would the motherboard have the same throttling issue too? A real pain to have to strip the screen off again….
Hmm, seems I might have to rethink the blade replacement. The article I referenced doesn’t mention that the Late 2015 iMac can have problems with blades that are too fast. It works but I’m getting a wake from sleep issue that seems to tally with this article
After reassembly, test that it starts up before rushing ahead and fixing the screen. I used a bit of masking tape on the corners to stop the screen falling off during the test. Just as well as I’d missed reconnecting the lower power cable to the power supply and had to disassemble it again. Amazing how fast it comes apart second time round! Quite a relief to find that I’d missed that connector as there’s nothing like reassembling a machine and it doesn’t power on…
I bought the iFixit kit without SSD and added a Crucial MX500 instead of the HD part of the fusion drive. Replaced the blade SSD with the 500GB WD model recommended in the article. I filed the screw slot to allow the Sinetech adapter to fit properly - easy and means there are no bent boards!
The kit does not include the T25 torx driver or the T5 bit that I needed to get the antenna cables off (see other comments re that step). Apart from that it has everything you need and is well worth the peace of mind when tackling this job.
These connectors seem pretty tough to remove until one understands the latch. Each side of the plug are two little sprung tabs (the tab is part of the spring clip which runs down the side of the plug on each side - makes sense once you see the removed plug!). Squeeze them in towards each other and then gently pull the plug from the socket. No great force, or even the spudger, needed once that is done.
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Hmm, seems I might have to rethink the blade replacement. The article I referenced doesn’t mention that the Late 2015 iMac can have problems with blades that are too fast. It works but I’m getting a wake from sleep issue that seems to tally with this article
iMac restarts. kernal panic report. NVMe SSD stops being recognized.
This issue seems to be confined to Late 2015 models and probably those with fusion drives, such as mine, which have a slower OEM blade.
After reassembly, test that it starts up before rushing ahead and fixing the screen. I used a bit of masking tape on the corners to stop the screen falling off during the test. Just as well as I’d missed reconnecting the lower power cable to the power supply and had to disassemble it again. Amazing how fast it comes apart second time round! Quite a relief to find that I’d missed that connector as there’s nothing like reassembling a machine and it doesn’t power on…
I successfully upgraded my late 2015 iMac with two SSDs. Got some very useful tips from this Macworld article: https://www.macworld.com/article/3386117...
I bought the iFixit kit without SSD and added a Crucial MX500 instead of the HD part of the fusion drive. Replaced the blade SSD with the 500GB WD model recommended in the article. I filed the screw slot to allow the Sinetech adapter to fit properly - easy and means there are no bent boards!
The kit does not include the T25 torx driver or the T5 bit that I needed to get the antenna cables off (see other comments re that step). Apart from that it has everything you need and is well worth the peace of mind when tackling this job.
Late 2015 iMac - mine had all T8 screws and 4 along the bottom row
These connectors seem pretty tough to remove until one understands the latch. Each side of the plug are two little sprung tabs (the tab is part of the spring clip which runs down the side of the plug on each side - makes sense once you see the removed plug!). Squeeze them in towards each other and then gently pull the plug from the socket. No great force, or even the spudger, needed once that is done.