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iMac Intel 27" EMC 2546 Power Supply Replacement

Potentially Dangerous

Potentially Dangerous

Injury may result if this procedure is not followed properly. Use caution and follow all warnings.

Replace the power supply in your Late 2012 27" iMac.

Before beginning any work on your iMac: Unplug the computer and press and hold the power button for ten seconds to discharge the power supply's capacitors.

Be very careful not to touch the capacitor leads or any exposed solder joints on the back of the power supply. Only handle the board by the edges.

Step 1 Power Supply  ¶ 

When working on the power supply, be very careful not to touch the capacitor leads or any exposed solder joints on the back of the power supply. Only handle the board by the edges. Disconnect the power supply control cable from the power supply.

Step 1 Power Supply  ¶ 

  • When working on the power supply, be very careful not to touch the capacitor leads or any exposed solder joints on the back of the power supply. Only handle the board by the edges.

  • Disconnect the power supply control cable from the power supply.

Step 2  ¶ 

Remove the following four screws securing the power supply to the rear case (size T8 or T10 depending on the exact model):

Step 2  ¶ 

  • Remove the following four screws securing the power supply to the rear case (size T8 or T10 depending on the exact model):

  • Two 23.7 mm Torx screws

  • Two 7.3 mm Torx screws

Step 3  ¶ 

Do not attempt to remove the power supply from the case; it is still attached to the logic board by two cables. Move the power supply board towards the left edge of the case and up to free it from the notch in the logic board. Move the power supply board towards the left edge of the case and up to free it from the notch in the logic board.

Step 3  ¶ 

  • Do not attempt to remove the power supply from the case; it is still attached to the logic board by two cables.

  • Move the power supply board towards the left edge of the case and up to free it from the notch in the logic board.

Step 4  ¶ 

Depress the tab on the DC power cable connector, then pull it straight out of its socket on the back of the logic board. Depress the tab on the DC power cable connector, then pull it straight out of its socket on the back of the logic board.

Step 4  ¶ 

  • Depress the tab on the DC power cable connector, then pull it straight out of its socket on the back of the logic board.

Step 5  ¶ 

Be very careful not to touch the capacitor leads or any exposed solder joints on the back of the power supply. Only handle the board by the edges. Flip the top of the power supply towards you, like opening a mailbox, to reveal the AC inlet cable connector. Disconnect the AC inlet cable connector.

Step 5  ¶ 

  • Be very careful not to touch the capacitor leads or any exposed solder joints on the back of the power supply. Only handle the board by the edges.

  • Flip the top of the power supply towards you, like opening a mailbox, to reveal the AC inlet cable connector.

  • Disconnect the AC inlet cable connector.