![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 is this actually corrosion or something else? Any advice would be ... 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 is this actually corrosion or something else? Any advice would be ...](https://preview.redd.it/zqfbliugoa771.jpg?width=1080&crop=smart&auto=webp&s=a9da32c9d072bd7b683714a7c5d36846166127f4)
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 is this actually corrosion or something else? Any advice would be ...
![Original Logic Board For iMac 21.5" A1418 Motherboard 820-3302-A 820-3482-A 820-00629-A 2012 2013 2014 2015 2017 Years - AliExpress Original Logic Board For iMac 21.5" A1418 Motherboard 820-3302-A 820-3482-A 820-00629-A 2012 2013 2014 2015 2017 Years - AliExpress](https://ae01.alicdn.com/kf/S4f14c22ca9bd4a40bc6ff90482253d50G/Original-Logic-Board-For-iMac-21-5-A1418-Motherboard-820-3302-A-820-3482-A-820.jpg)
Original Logic Board For iMac 21.5" A1418 Motherboard 820-3302-A 820-3482-A 820-00629-A 2012 2013 2014 2015 2017 Years - AliExpress
![Board 3.4 GHz SSD – 4GB /Radeon 560 for iMac 21.5-inch Mid 2017 A1418 DIY Parts replacement Logic Boards Board 3.4 GHz SSD – 4GB /Radeon 560 for iMac 21.5-inch Mid 2017 A1418 DIY Parts replacement Logic Boards](https://api.macpartsdepot.com/img/600/744/resize/m/a/mac-163.jpg)
Board 3.4 GHz SSD – 4GB /Radeon 560 for iMac 21.5-inch Mid 2017 A1418 DIY Parts replacement Logic Boards
![Fully Test Work Original Logic Board For iMac 21.5" A1418 Motherboard 820-00597-A 820-00629-A Mid 2017 Year - AliExpress Fully Test Work Original Logic Board For iMac 21.5" A1418 Motherboard 820-00597-A 820-00629-A Mid 2017 Year - AliExpress](https://ae01.alicdn.com/kf/S7a74ef7ab1b041d0abf7fab0dcf32103R/Fully-Test-Work-Original-Logic-Board-For-iMac-21-5-A1418-Motherboard-820-00597-A-820.jpg)
Fully Test Work Original Logic Board For iMac 21.5" A1418 Motherboard 820-00597-A 820-00629-A Mid 2017 Year - AliExpress
![Amazon.com: Willhom Power Supply Board (185W) Replacement for iMac Intel 21.5" A1418 (Late 2012-Mid 2017) A2116 (2019) : Electronics Amazon.com: Willhom Power Supply Board (185W) Replacement for iMac Intel 21.5" A1418 (Late 2012-Mid 2017) A2116 (2019) : Electronics](https://m.media-amazon.com/images/I/61OMf4QAf7L.jpg)
Amazon.com: Willhom Power Supply Board (185W) Replacement for iMac Intel 21.5" A1418 (Late 2012-Mid 2017) A2116 (2019) : Electronics
![Probably of no use to anyone here, but the 2.8GHz late 2015 iMac logic board requires a different heatsink than the 1.6GHz board because the CPU is in a different location. Ask Probably of no use to anyone here, but the 2.8GHz late 2015 iMac logic board requires a different heatsink than the 1.6GHz board because the CPU is in a different location. Ask](https://i.redd.it/o3sjzkdg065a1.jpg)
Probably of no use to anyone here, but the 2.8GHz late 2015 iMac logic board requires a different heatsink than the 1.6GHz board because the CPU is in a different location. Ask
![Amazon.com: Willhom Power Supply Board (185W) Replacement for iMac Intel 21.5" A1418 (Late 2012-Mid 2017) A2116 (2019) : Electronics Amazon.com: Willhom Power Supply Board (185W) Replacement for iMac Intel 21.5" A1418 (Late 2012-Mid 2017) A2116 (2019) : Electronics](https://m.media-amazon.com/images/I/61E8MWqeuwL._AC_UF350,350_QL80_.jpg)
Amazon.com: Willhom Power Supply Board (185W) Replacement for iMac Intel 21.5" A1418 (Late 2012-Mid 2017) A2116 (2019) : Electronics
![Faulty Baord-A1418 Motherboard Logic Board For Apple IMAC 21.5'' Motherboard Core i5 Mid-2017 820-00597-06 EMC3069 - Mecnote Parts Faulty Baord-A1418 Motherboard Logic Board For Apple IMAC 21.5'' Motherboard Core i5 Mid-2017 820-00597-06 EMC3069 - Mecnote Parts](https://macnote.net/images/cache/820-00597.500.png)