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How to replace the main logic board in a 27-inch iMac 5K

Replacing the Fusion Drive with both a SSD and an harddisk

July 30, 2020 -

This month I did an attempt to upgrade my 27-inch iMac 5K. I wanted to replace the fusion drive with a SSD and a large hardisk. In addition I decided this was a good time to upgrade the RAM memory as well, maxing it out at 64GB. I was on a mission to create the ultimate iMac, but things didn't go to plan!

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Removing the Fusion Drive 1TB harddisk
Removing the Fusion Drive 1TB harddisk
Work in progress: most parts removed, the logic board remaining
Work in progress: most parts removed, the logic board remaining
YES, it works! The new logic board accepted keyboard input and allowed me to proceed with macOS installation
YES, it works! The new logic board accepted keyboard input and allowed me to proceed with macOS installation
The Debian GNU/Linux installer was in fact recognised by the iMac
The Debian GNU/Linux installer was in fact recognised by the iMac
Creating a USB recovery drive using another MacBook
Creating a USB recovery drive using another MacBook
Disconnecting the power button cable
Disconnecting the power button cable

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