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iMac Intel 21.5" EMC 2389 Logic Board Replacement

Replace the logic board in your iMac Intel 21.5" EMC 2389.

Use this guide to remove your logic board assembly.

Sections

Étape 1 Logic Board  ¶ 

In the proceeding steps, you will disconnect the following cables:

Étape 1 Logic Board  ¶ 

  • In the proceeding steps, you will disconnect the following cables:

  • SD Board and microphone

  • Left/Right Speaker

  • Wi-Fi Antenna

  • Bluetooth/Ambient Light Sensor/Camera/Left Temperature Sensor, Hard Drive Temperature Sensor and Hard Drive Fan

  • CPU Fan/Ambient Temperature and Power Button

  • IR Sensor

Étape 2  ¶ 

Pull the microphone cable connector toward the top edge of the iMac to disconnect it from the logic board.

Étape 2  ¶ 

  • Pull the microphone cable connector toward the top edge of the iMac to disconnect it from the logic board.

Étape 3  ¶ 

Pull the SD board cable out of its socket on the logic board.

Étape 3  ¶ 

  • Pull the SD board cable out of its socket on the logic board.

Étape 4  ¶ 

Disconnect the left speaker and right speaker cables by pulling their connectors toward the right side of the iMac. Disconnect the left speaker and right speaker cables by pulling their connectors toward the right side of the iMac.

Étape 4  ¶ 

  • Disconnect the left speaker and right speaker cables by pulling their connectors toward the right side of the iMac.

Étape 5  ¶ 

Use the flat end of a spudger to pry both AirPort antenna connectors up from their sockets on the AirPort board. The gray antenna attaches to the socket on the left and the black antenna attaches to the socket on the right.

Étape 5  ¶ 

  • Use the flat end of a spudger to pry both AirPort antenna connectors up from their sockets on the AirPort board.

  • The gray antenna attaches to the socket on the left and the black antenna attaches to the socket on the right.

Étape 6  ¶ 

Disconnect the hard drive fan by pulling its connector toward the top edge of the iMac.

Étape 6  ¶ 

  • Disconnect the hard drive fan by pulling its connector toward the top edge of the iMac.

Étape 7  ¶ 

Pull the hard drive thermal sensor cable out of its socket and toward the top edge of the iMac to disconnect it from the logic board.

Étape 7  ¶ 

  • Pull the hard drive thermal sensor cable out of its socket and toward the top edge of the iMac to disconnect it from the logic board.

Étape 8  ¶ 

Use your thumbnails on both sides of the Bluetooth/ambient light sensor/camera/left temperature connector to push it toward the top edge of the iMac and out of its socket on the logic board.

Étape 8  ¶ 

  • Use your thumbnails on both sides of the Bluetooth/ambient light sensor/camera/left temperature connector to push it toward the top edge of the iMac and out of its socket on the logic board.

Étape 9  ¶ 

Pull the CPU fan/ambient temperature sensor connector toward the bottom left edge of the iMac and out of its socket on the logic board. Pull the power button connector toward the bottom left corner of the iMac to disconnect it from its socket on the logic board. Pull the power button connector toward the bottom left corner of the iMac to disconnect it from its socket on the logic board.

Étape 9  ¶ 

  • Pull the CPU fan/ambient temperature sensor connector toward the bottom left edge of the iMac and out of its socket on the logic board.

  • Pull the power button connector toward the bottom left corner of the iMac to disconnect it from its socket on the logic board.

Étape 10  ¶ 

Remove the piece of tape covering the IR sensor cable.

Étape 10  ¶ 

  • Remove the piece of tape covering the IR sensor cable.

Étape 11  ¶ 

Use your thumbs to push the IR sensor connector out of its socket and toward the top edge of the iMac.

Étape 11  ¶ 

  • Use your thumbs to push the IR sensor connector out of its socket and toward the top edge of the iMac.

Étape 12  ¶ 

Pull the IR sensor board up from behind the front face of the outer case.

Étape 12  ¶ 

  • Pull the IR sensor board up from behind the front face of the outer case.

  • Remove the IR sensor and set it aside.

Étape 13  ¶ 

Remove the following seven screws:

Étape 13  ¶ 

  • Remove the following seven screws:

  • Two 7 mm T10 torx screws

  • One 30 mm T10 Torx screw

  • Two 25 mm T10 Torx screws

  • Two 21 mm T10 Torx screws

Étape 14  ¶ 

Remove the following four screws: One 9.3 mm T10 coarse-threaded screw

Étape 14  ¶ 

  • Remove the following four screws:

  • One 9.3 mm T10 coarse-threaded screw

  • One 25 mm T10 coarse-threaded screw

  • Two 22 mm fine-threaded screws

  • Pull the upper right and lower left corners of the power supply away from the rear case to dislodge the mounting posts attached to the power supply's corners.

Étape 15  ¶ 

Carefully lift the power supply out of the outer case and rotate it to expose the cable lock as shown, minding the DC-out and AC-in cables still attaching it to the iMac. Disconnect the DC-out cable by depressing the locking mechanism on the connector while you pull the connector away from its socket on the power supply.

Étape 15  ¶ 

  • Carefully lift the power supply out of the outer case and rotate it to expose the cable lock as shown, minding the DC-out and AC-in cables still attaching it to the iMac.

  • Disconnect the DC-out cable by depressing the locking mechanism on the connector while you pull the connector away from its socket on the power supply.

  • Once the locking mechanism has cleared the socket, pull the DC-in connector away from the power supply.

Étape 16  ¶ 

Disconnect the AC-In cable by depressing the locking mechanism while pulling the connector away from its socket.

Étape 16  ¶ 

  • Disconnect the AC-In cable by depressing the locking mechanism while pulling the connector away from its socket.

  • Remove the power supply from the outer case.

Étape 17  ¶ 

Remove the plastic wall that is installed directly to the right of the LED driver board.

Étape 17  ¶ 

  • Remove the plastic wall that is installed directly to the right of the LED driver board.

Étape 18  ¶ 

Remove the plastic pressure wall installed next to the hard drive.

Étape 18  ¶ 

  • Remove the plastic pressure wall installed next to the hard drive.

Étape 19  ¶ 

Slightly pull the logic board away from the back of the outer case, then lift it upward to clear the lower front face of the outer case. Slightly pull the logic board away from the back of the outer case, then lift it upward to clear the lower front face of the outer case.

Étape 19  ¶ 

  • Slightly pull the logic board away from the back of the outer case, then lift it upward to clear the lower front face of the outer case.

Étape 20  ¶ 

Disconnect the audio port cable by pulling its connector away from the front face of the logic board.

Étape 20  ¶ 

  • Disconnect the audio port cable by pulling its connector away from the front face of the logic board.

Étape 21  ¶ 

If present, peel off the tape securing the hard drive SATA cable to the logic board.

Étape 21  ¶ 

  • If present, peel off the tape securing the hard drive SATA cable to the logic board.

Étape 22  ¶ 

Depress the locking mechanism and carefully pull the DC-In cable out of its socket on the back of the logic board. Depress the locking mechanism and carefully pull the DC-In cable out of its socket on the back of the logic board.

Étape 22  ¶ 

  • Depress the locking mechanism and carefully pull the DC-In cable out of its socket on the back of the logic board.

Étape 23  ¶ 

Being careful not to damage the socket on the logic board, gently pull the hard drive SATA data cable straight out of its socket on the logic board.

Étape 23  ¶ 

  • Being careful not to damage the socket on the logic board, gently pull the hard drive SATA data cable straight out of its socket on the logic board.

  • Remove the logic board, minding any cables that may get caught.

  • When reinstalling the logic board, plug in a mini display port cable and a USB cable into the outer USB port before tightening the logic board screws to ensure proper alignment.