Chosen Solution
I just upgraded the HDD with a 1TB SSD and the RAM to 32GB. Did everything according to the ifixit guide and now the 2 USB-C (TB) ports don’t work. Tried re-installing the OS on the SSD, tried the old HDD still the ports don’t work. Tried to align them more properly like other people say but to no avail. Everything else works just fine. Any suggestions?
Once you get the logic board out following this guide iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement you’ll need to compare it to a good board referencing Steps 11 & 12 here: iMac Intel 21.5" Retina 4K Display 2017 Teardown. Focus on the two TI chips CD3215C00 USB-C port controller (light blue). These often get damaged
Just a thought. I noticed you didn’t mention reverting back to your previous memory upgrade levels. Have you tried that?
I just installed 32 gigs of ram and 1 tb ssd in my imac and have the same issue. Worked before installation and now not working. Any more updates on this? I am going to take it back to my tech guys, but it seems weird that the same thing would happen. How much ram did you put in? What type of ram?
So just upgraded a 21.5” 2017 Machine, and got the same problem. Interestingly the built-in mic seems to be an issue as well. And no it’s not because I covered the mic with adhesive. It’s just not registering anything.System report shows TB4 available, but no TB connections will show up.An HD TV plugged in via USB-C (in the TB ports) is working, but only in one of the Ports.Any idea’s?
