Apple iMAC AIO 27" A1312 Late 2009 Desktop Intel Logic Board LGA1156 820-2733-A

This listing is for a Genuine Apple Logic Board (820-2733-A) designed specifically for the
27-inch iMac A1312 – Late 2009 model featuring the LGA1156 CPU socket.

This board is fully tested for:

• System boot and macOS installation

• USB / FireWire / Ethernet ports

• RAM slot integrity

• GPU slot and display output

• Audio and thermal sensors

Ideal replacement for failed 2009 iMac logic boards that require the LGA1156 layout.
Not compatible with any 2010 or 2011 A1312 iMac models.

⚙️ Specifications:

• Brand: Apple

• Model: iMac 27-inch (Late 2009)

• Model Number: A1312

• EMC: 2309

• Logic Board Part Number: 820-2733-A

• CPU Socket: LGA1156 (supports Core i5 / Core i7 Lynnfield processors)

• Graphics Support:
  • ATI Radeon HD 4670
  • ATI Radeon HD 4850

• RAM: DDR3 1066/1333 MHz (up to 16GB)

• Ports:
  • USB 2.0
  • FireWire 800
  • Mini DisplayPort
  • Ethernet
  • Audio in/out

• Condition: Used – Fully Tested & Working

✴️ Compatibility & Additional Information:

🔹 Compatible ONLY with:

• iMac (27-inch, Late 2009)
  • Model A1312
  • EMC 2309
  • CPU socket type: LGA1156

🔹 Not Compatible With:

• iMac (27-inch, Mid 2010) – A1312 (uses LGA1156 but different board configuration)

• iMac (27-inch, Mid 2011) – A1312 (uses LGA1155 CPU & different logic board)

• Any A1311, A1418, A1419, or 2012+ iMac

🔹 Important Buyer Note:
This logic board works ONLY with Late 2009 A1312 models that use LGA1156 CPUs.
Please confirm your CPU socket type before purchasing.

Installation:
Professional installation recommended due to thermal sensors and GPU alignment.

⚠️ Notes:

• No firmware or MDM lock.

• CPU, GPU, RAM, and heatsink not included.

• Fully verified with Apple diagnostics.