The logic board of the iMac (27-inch, Mid 2010), model A1312, 2010, 27-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 820-2901-A (631-1339) as the Mid 2010 A1312 board, iMac11,3, LGA 1156, and Mac of All Trades sells it as the Mid 2010 27-inch board (i3 3.2 GHz 661-5530, i5 2.8 GHz 661-5547, i7 2.93 GHz 661-5577; MC510LL/A, MC511LL/A, MC784LL/A). The Mid 2011 27-inch board is 820-2828-A. 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.