iMac (24-inch, 2024, Four ports) Logic Board

Before You Begin

Remove the following parts before you begin:

Tools

2.5 mm hex nut driver
Adjustable torque driver (10–34 Ncm)
Antenna tool
ESD-safe tweezers
Kapton tape
Nylon probe (black stick)
Support wedge kit
Torque driver (teal, 0.75 kgf cm)
Torx Plus 3IP 25 mm bit
Torx Plus 3IP 44 mm half-moon bit

Refer to a full list of tools required for all repairs.

Caution

This procedure requires System Configuration. After you’ve completed all removal and reassembly steps, learn how to initiate the System Configuration process.

Removal

Position the housing with the logic board facing up.
Use the teal torque driver and 3IP 44 mm half-moon bit to remove the three 3IP screws (923-11029) from the antenna grounding clips on the logic board.
Use the antenna tool to lift the ends of the three antenna coaxial cables off the connectors.
Use ESD-safe tweezers to peel off the polyester film tape from the left fan connector. Save it for reassembly.
Use the flat end of the black stick to flip up the locking lever on the left fan connector.
Separate the tips of the ESD-safe tweezers. Insert one tip under the wide portion of the left fan flex cable as shown to loosen the adhesive between the fan flex cable and the logic board. Then slide the end of the fan flex cable out of the connector.
- Caution: Don’t touch any of the small parts on the logic board. Keep the tweezers parallel to the logic board to prevent damage.
Repeat steps 4 through 6 on the other side of the logic board to disconnect the right fan flex cable. Then continue to step 8.
Use the flat end of the black stick to lift the end of the speaker cable off the connector.
Use ESD-safe tweezers to peel the polyester film tape off the display backlight flex cable connector. Save it for reassembly.
Pinch the sides of the end of the display backlight flex cable and slide it out of the connector.
Use the flat end of the black stick to press and hold the “PUSH” button on the zero-insertion force (ZIF) audio board and power button connector. While pressing the button, slide the end of the audio board and power button flex cable out of the connector. Then press and hold the "PUSH" button on the ZIF microphone connector and slide the microphone flex cable out of the connector.
Pull the tab to flip up the locking bar on the camera and embedded DisplayPort (eDP) flex cable (1). Slide the end of the camera and eDP flex cable out of the connector (2). Then remove the camera and eDP flex cable from the housing and save it for reassembly.
Pull the tab to flip up the locking bar on the logic board end of the high-speed flex cable (1). Slide the end of the high-speed flex cable out of the connector on the logic board (2).
Pull the tab to flip up the locking bar on the adapter board end of the high-speed flex cable (1). Slide the end of the high-speed flex cable out of the connector on the adapter board (2). Then remove the high-speed flex cable from the housing.
Use the flat end of the black stick to release the adhesive between the high-speed flex cable and the adapter board.
Use the 10–34 Ncm adjustable torque driver and 3IP 25 mm bit to remove the four 3IP screws (923-11034) from the low-speed flex cable to adapter board connector cowling. Then remove the cowling and save it for reassembly.
Use the flat end of the black stick to lift the two ends of the low-speed flex cable off the connectors.
Gently pull the low-speed flex cable away from the housing to release the adhesive between the flex cable and the housing. Use the flat end of the black stick if needed.
- Caution: Ensure that you don't crease the flex cable while gently pulling it away from the housing.
Use the 2.5 mm hex nut driver to remove nine 2.5 mm hex nut screws from the logic board.
- Five 2.5 mm hex nut screws (923-11028) (1)
- Four 2.5 mm hex nut screws (923-11025) (2)
Move the antenna coaxial cables and flex cables out of the way as you tilt forward the logic board (1). Then lift the logic board and low-speed flex cable out of the housing (2).
- Notes
  - The low-speed flex cable is attached to the back of the logic board.
  - If needed, use Kapton tape to keep the antenna coaxial cables and flex cables out of the way as you remove the logic board.
  - If the logic board doesn't tilt forward easily, you may need to remove the foam wedge from the stand and push the logic board through the DC power inlet hole in the back of the housing. Reinstall the foam wedge after you complete this step.

Reassembly

If you're installing a replacement logic board, refer to the low-speed flex cable repair article for instructions on how to transfer the low-speed flex cable from the existing logic board to the replacement logic board.
If you're installing a replacement logic board, remove the plastic liner covering the DC inlet on the back of the logic board.
Move the antenna coaxial cables and flex cables out of the way. Position the logic board and low-speed flex cable in the housing (1). Then tilt the logic board toward the housing (2).
- Warning: Ensure that the battery and DC inlet on the logic board are properly aligned with the housing as shown. Avoid shifting the logic board left or right during installation, as this could cause the battery to short.
Ensure that the logic board is properly positioned in the housing and no antenna coaxial cables or flex cables are trapped under the logic board.
Use the 2.5 mm hex nut driver to reinstall the nine 2.5 mm hex nut screws into the logic board.
- Five 2.5 mm hex nut screws (923-11028) (1)
- Four 2.5 mm hex nut screws (923-11025) (2)
Press the two ends of the low-speed flex cable to the connectors on the adapter board.
- Caution: Don’t bend the connectors.
- Important: If you replaced the low-speed flex cable, remove the adhesive release liners from the back of the flex cable before connecting the two ends to the adapter board. Don’t adhere the flex cable to the housing yet.
- Note: Ensure that the low-speed flex cable connectors are fully connected.
Set the torque value on the 10–34 Ncm adjustable torque driver to 11.5 Ncm.
Position the low-speed flex cable to adapter board connector cowling over the connectors. Then use the adjustable torque driver and 3IP 25 mm bit to install the four 3IP screws (923-11034) into the cowling.
Press the low-speed flex cable to adhere it to the housing in the areas shown.
Slide the end of the left fan flex cable into the connector (1). Then flip down the locking lever (2).
Press the polyester film tape onto the end of the left fan flex cable.
Press the left fan flex cable to adhere it to the logic board.
Repeat steps 10 through 12 to connect the right fan flex cable.
Slide the adapter board end of the high-speed flex cable into the connector on the adapter board (1). Then flip down the locking bar on the high-speed flex cable (2).
Slide the logic board end of the high-speed flex cable into the connector on the logic board (1). Then flip down the locking bar on the high-speed flex cable (2).
Press the high-speed flex cable to adhere it to the adapter board.
Slide the end of the camera and eDP flex cable into the connector on the logic board (1). Then flip down the locking bar on the camera and eDP flex cable (2).
Press the end of the speaker cable to the connector.
Slide the end of the display backlight flex cable into the connector.
Press the polyester film tape onto the display backlight flex cable connector.
Slide the ends of the microphone flex cable and the audio board and power button flex cable into the connectors.
Use the blunt end of the antenna tool to press the ends of the three antenna coaxial cables to the connectors.
Use the teal torque driver and 3IP 44 mm half-moon bit to reinstall the three 3IP screws (923-11029) into the antenna grounding clips on the logic board.
If you’re installing a replacement logic board, pull the tab on the battery protective liner to remove the liner.