The logic board of the iMac (21.5-inch, Mid 2010), model A1311, 2010, 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. Info said Mid 2011. Beetstech lists 820-2784-A (631-1335, 631-1429; APN 661-5534/5538/5596) as the Mid 2010 A1311 board, iMac11,2, and Mac of All Trades sells it as the Mid 2010 3.2 GHz Core i3 board for MC508LL/A. The Mid 2011 board is 820-2641-A (rows swapped in the CSV). Year changes from 2011 to 2010. 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.