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iMac G5 20" Model A1145 Logic board Replacement

Like brain surgery? Use this guide to replace your logic board.

手順 1 Logic board  ¶ 

Disconnect the IR board cable by pulling its connector away from the socket on the IR board.

手順 1 Logic board  ¶ 

  • Disconnect the IR board cable by pulling its connector away from the socket on the IR board.

手順 2  ¶ 

Remove the two T6 Torx screws securing the IR board bracket to the IR board. Remove the two T6 Torx screws securing the IR board bracket to the IR board.

手順 2  ¶ 

  • Remove the two T6 Torx screws securing the IR board bracket to the IR board.

手順 3  ¶ 

De-route the IR cable from under the aluminum heat sink and tuck it behind the optical drive to keep it out of the way.

手順 3  ¶ 

  • De-route the IR cable from under the aluminum heat sink and tuck it behind the optical drive to keep it out of the way.

手順 4  ¶ 

Remove the single T10 Torx screw securing the left speaker to the rear case. The screw for the left speaker has coarse threads.

手順 4  ¶ 

  • Remove the single T10 Torx screw securing the left speaker to the rear case.

  • The screw for the left speaker has coarse threads.

  • Lift the left speaker out of the rear case and de-route its cable across the logic board.

手順 5  ¶ 

Remove the single T10 Torx screw securing the right speaker to the rear case. The right speaker screw has fine threads.

手順 5  ¶ 

  • Remove the single T10 Torx screw securing the right speaker to the rear case.

  • The right speaker screw has fine threads.

  • Lift the right speaker out of the rear case, minding the short cable between the speaker and its connector (located slightly above the right speaker).

手順 6  ¶ 

Disconnect the speakers from the logic board by pulling their connector toward the top edge of the iMac.

手順 6  ¶ 

  • Disconnect the speakers from the logic board by pulling their connector toward the top edge of the iMac.

手順 7  ¶ 

Remove the two Phillips or two T6 Torx screws securing the AirPort/Bluetooth board to the logic board.

手順 7  ¶ 

  • Remove the two Phillips or two T6 Torx screws securing the AirPort/Bluetooth board to the logic board.

手順 8  ¶ 

Use your finger to lift the AirPort/Bluetooth board from its left edge, disconnecting it from the logic board.

手順 8  ¶ 

  • Use your finger to lift the AirPort/Bluetooth board from its left edge, disconnecting it from the logic board.

  • Lift the board from its left edge only.

手順 9  ¶ 

Use the flat end of a spudger to pry both antenna cable connectors up off the AirPort/Bluetooth board. Use the flat end of a spudger to pry both antenna cable connectors up off the AirPort/Bluetooth board.

手順 9  ¶ 

  • Use the flat end of a spudger to pry both antenna cable connectors up off the AirPort/Bluetooth board.

手順 10  ¶ 

Disconnect the DC-in cable by simultaneously depressing both locking arms and pulling its connector away from the socket on the logic board toward the top of your iMac. After both locking arms pass their retaining tabs, it is helpful to push the arms toward the top edge of your iMac while wiggling the connector.

手順 10  ¶ 

  • Disconnect the DC-in cable by simultaneously depressing both locking arms and pulling its connector away from the socket on the logic board toward the top of your iMac.

  • After both locking arms pass their retaining tabs, it is helpful to push the arms toward the top edge of your iMac while wiggling the connector.

手順 11  ¶ 

Disconnect the ambient light sensor by pulling its connector away from the face of the logic board.

手順 11  ¶ 

  • Disconnect the ambient light sensor by pulling its connector away from the face of the logic board.

手順 12  ¶ 

Disconnect the optical drive fan from the logic board. To aid in removal, it is helpful to use both of your thumbnails to push the ears on either side of the connector toward the top edge of the iMac.

手順 12  ¶ 

  • Disconnect the optical drive fan from the logic board.

  • To aid in removal, it is helpful to use both of your thumbnails to push the ears on either side of the connector toward the top edge of the iMac.

手順 13  ¶ 

Disconnect the IR/camera cable from the logic board. This connector is especially wide and prone to breakage.

手順 13  ¶ 

  • Disconnect the IR/camera cable from the logic board.

  • This connector is especially wide and prone to breakage.

  • To aid in removal, it is helpful to use one hand to pinch the cables against a spudger and pull up toward the top edge of the iMac while pulling up gently on the cables with your other hand.

手順 14  ¶ 

Disconnect the optical drive thermal sensor cable from the logic board by pulling its connector toward the left edge of the iMac.

手順 14  ¶ 

  • Disconnect the optical drive thermal sensor cable from the logic board by pulling its connector toward the left edge of the iMac.

手順 15  ¶ 

Remove the two T6 Torx screws securing the optical drive connector to the logic board.

手順 15  ¶ 

  • Remove the two T6 Torx screws securing the optical drive connector to the logic board.

手順 16  ¶ 

Use the flat end of a spudger to pry the optical drive connector up off the logic board.

手順 16  ¶ 

  • Use the flat end of a spudger to pry the optical drive connector up off the logic board.

  • It is helpful to insert the spudger under the top or bottom edge of the connector and twist to separate the connector from the logic board.

手順 17  ¶ 

Disconnect the CPU fan from the logic board by pulling its connector toward the top edge of the iMac.

手順 17  ¶ 

  • Disconnect the CPU fan from the logic board by pulling its connector toward the top edge of the iMac.

手順 18  ¶ 

Disconnect the hard drive thermal sensor from the logic board by pulling its connector toward the top edge of the iMac.

手順 18  ¶ 

  • Disconnect the hard drive thermal sensor from the logic board by pulling its connector toward the top edge of the iMac.

手順 19  ¶ 

Disconnect the hard drive fan by pulling its connector away from the face of the logic board.

手順 19  ¶ 

  • Disconnect the hard drive fan by pulling its connector away from the face of the logic board.

手順 20  ¶ 

Disconnect the power button cable by pulling its connector away from the face of the logic board.

手順 20  ¶ 

  • Disconnect the power button cable by pulling its connector away from the face of the logic board.

手順 21  ¶ 

Remove the two T6 Torx screws near the top of the heat sinks.

手順 21  ¶ 

  • Remove the two T6 Torx screws near the top of the heat sinks.

手順 22  ¶ 

Remove the following seven screws securing the logic board to the rear case:

手順 22  ¶ 

  • Remove the following seven screws securing the logic board to the rear case:

  • Three coarse-thread T10 Torx.

  • Three fine-thread T10 Torx.

  • One long coarse-thread T10 Torx.

手順 23  ¶ 

Tuck the RAM arms into the iMac so they rest on the perforated metal grille along its lower edge. Tuck the RAM arms into the iMac so they rest on the perforated metal grille along its lower edge.

手順 23  ¶ 

  • Tuck the RAM arms into the iMac so they rest on the perforated metal grille along its lower edge.

手順 24  ¶ 

Rotate the top of the logic board toward yourself slightly.

手順 24  ¶ 

  • Rotate the top of the logic board toward yourself slightly.

  • Pull the right edge of the logic board toward yourself slightly to free the I/O ports from the rear case, being careful not to bend the board.

  • Continue rotating the board toward yourself until you have enough room to reach the SATA connector, shown in the next step.

手順 25  ¶ 

Continue rotating the board toward yourself until you have enough room to reach the SATA connector (shown in red). Insert the blunt end of a metal spudger between the SATA connector and its socket. Twist the shaft of the metal spudger to separate the connector from its socket.

手順 25  ¶ 

  • Continue rotating the board toward yourself until you have enough room to reach the SATA connector (shown in red).

  • Insert the blunt end of a metal spudger between the SATA connector and its socket. Twist the shaft of the metal spudger to separate the connector from its socket.

  • Disconnect the SATA cable from the logic board.

  • Lift the logic board out of the rear case by its edges, minding any cables that may get caught.