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eBay
Upgrade your iMac with this used, tested 21.5" 4K 2017 logic board (A1418 EMC 3069). Includes Intel Core i5-7500 quadâcore @3.4GHz and Radeon Pro 560 4GB. Sold as the logic board only--RAM, SSD, cables, and accessories not included. Compatible with iMac Retina 4K 21.5" (2017) EMC 3069. May show minor signs of previous use. Professional installation recommended. Please verify model and part number (820-01061-A, also listed as 820-01079-A).
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Radon Pro 575 4GB Graphic. 8Gb RAM (easily expands to 32GB Ram). The following specs are common to all the macs at the school, though I couldn't verify because of the screen issue.
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VENTURA RADEON PRO 555. - MAC OS VENTURA IS INSTALLED. POWER CORD, KEYBOARD AND MOUSE. WE DO NOT WARRANTY THE KEYBOARD AND MOUSE. IT IS INCLUDED AT NO COST. APPLE SPECS. Connectivity includes four USB 3.0 ports, dual Thunderbolt 3 (USB-C) ports, Gigabit Ethernet, 802.11ac Wi-Fi, and Bluetooth 4.2.
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eBay
Printed part Number : LM215WF3(SD)(D1), LM215WF3(SD)(D2), LM215WF3(SD)(D3), LM215WF3(SD)(D4), LM215WF3(SD)(D5). iMac 21.5" A1418. iMac18,1 Mid 2017: MMQA2LL/A (2.3 GHz Core i5). Genuine Apple used part.
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IMac 21.5" A1418. Versions of this board exist with and without SSD connector, but this particular boarddoes include the PCIe SSD connector for installation of Apple's proprietary blade SSDs. Onboard GPU: AMD Radeon Pro 555 (2GB).
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