Logic Board, Retina 4K





  • Replacement logic board with CPU and heatsink for the iMac 21.5" A1418 (Late 2015) with Retina 4K LCD display assembly.

What's Included

  • Depends on option selected.

Identifying Numbers

  • APN : 661-02985, 661-02986, 661-02987, 661-03279, 661-03282

    Apple Part Numbers

    • Created for internal Apple use.
    • Never visible on the item.
  • PPN : 820-00431-02, 820-00431-A

    Printed Part Numbers

    • Created by manufacturers during production.
    • Always visible on the item.

Tech Specs

  • Onboard CPU: 3.1GHz Intel Core i5-5675R or 3.3GHz Core i7-5775R
  • Onboard GPU: Intel Iris Pro 6200
  • Onboard RAM: 8GB or 16GB LPDDR3 (1867MHz)



Find your device to verify compatibility.

Not Compatible




Model Number: {{formatString(device.model_number)}}
Order Number: {{formatString(device.order_number)}}
Model Identifier: {{formatString(device.model_identifier)}}
EMC Number: {{formatString(device.emc_number)}}
Notes: {{device.notes}}

No devices found

iMac 21.5" A1418
  • iMac16,2 Retina 4K Late 2015: MK542LL/A (3.1 GHz Core i5)
  • iMac16,2 Retina 4K Late 2015: MK542LL/A (3.3 GHz Core i7)