The logic board of the iMac (21.5-inch, Late 2013), model A1418, 2013, 21.5-inch, integrated graphics (Iris Pro). Known faults are being collected.
No guided tree is live for this board yet. The profile, the viewer and manual entry are there on the free plan, and the first sessions on it build the tree.
Checked on 2026-10-29 against 2 sources: corrected. Info 'Mid 2014' changed to 'Late 2013' and year 2014 changed to 2013. Every parts listing (eBay, gotlaptopparts) and an iFixit answer put 820-3588-A in the Late 2013 2.7GHz Core i5 (i5-4570R, ME086LL/A, Apple part 661-7923) iMac; everymac maps ME086LL/A to iMac14,1 Late 2013 (EMC 2638). The Mid 2014 21.5-inch iMac (iMac14,4) uses 820-4668 per Beetstech. Board is the 2.7GHz Iris Pro configuration (iMac14,1). The Late 2013 2.9GHz/GT 750M iMac14,3 is not covered by these listings. No Beetstech page found for this number; sources are reseller listings plus iFixit. Consistency review: variant extended from '21.5-inch' to name the Iris Pro configuration (taken from the notes above) so this row is distinguishable from 820-3482, the 2.9 GHz / GT 750M Late 2013 21.5-inch (iMac14,3). Revision A is a placeholder until Studio records the real revisions.
Open the board in NextProbe, answer the symptom questions and follow the lit point. The free plan includes three guided sessions a month. Your own boardview and schematic stay on your machine.