The logic board of the iMac (21.5-inch, Early 2013), model A1418, 2013, 21.5-inch. 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. year 2012 changed to 2013 and info 'Slim Late 2012' to 'Early 2013'. Beetstech lists PPN 820-3172-A (APN 661-7417) as the 3.3 GHz Core i3 / HD Graphics 4000 board for the iMac 21.5-inch A1418 Early 2013, order ME699LL/A (education model); an eBay listing describes the same board as 'iMac 21,5" A1418 Early 2013'; the badcaps schematic index names it 'Apple iMac A1418 21.5" Logic Board 820-3172'. A1418 unchanged. 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.