923-05163 iMac 24″ 2021 A2438 M1 USB-C Adapter Board

Product Details:

Apple Part Number: 923-05163
Component Name: USB-C Adapter Board / I/O Board
Compatible Model: Apple iMac 24″ M1 (2021) – Model A2438
EMC Number: 3662

 Technical Description:

The USB-C Adapter Board (also known as the I/O board) is a critical internal component for managing external connectivity on the iMac 24" M1 (2021). This board handles the interface between the main logic board and the external USB-C/Thunderbolt ports.

Key Functions & Features:

Port Support:

Compatible with 2-Port or 4-Port rear housing configurations (varies by system)
Supports Thunderbolt / USB 4 and USB-C data transfer
Board Designation: Sits between the logic board and rear enclosure, delivering signal routing and port power
Connector Interfaces:

USB-C female ports (mounted)
Flex cable connector for logic board interface
Electrical Integrity: Includes integrated shielding and grounding structures for EMI protection

 
Installation Notes:

Professional installation is recommended.
Designed for Model A2438 only; not compatible with other iMac or Mac models.
Connects to the logic board via flex ribbon; no additional firmware configuration required.

 
Compatibility Notice:

For use only with iMac 24-inch (M1, 2021) – Model A2438.
Not compatible with Intel-based iMacs or models using M1 Pro, Max, or newer Apple Silicon variants.