Source Replacement Laptop Mainboard For iMac A1312 27" MB952 MB953 Logic Board 2010 on m.alibaba.com
2017 21.5” iMac 4K completely died during a software update. Apple Store claims corrosion is the issue and that it requires a $500 logic board replacement. Has anyone seen this before? And
How to Install the Motherboard in Apple iMac (27", mid 2011) - YouTube