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Introduction

Replace a faulty ambient temperature sensor to maintain proper temperature feedback.

  1. Loosen the three Phillips screws securing the access door to the bottom edge of your iMac. These screws will remain captive in the access door.
    • Loosen the three Phillips screws securing the access door to the bottom edge of your iMac.

    • These screws will remain captive in the access door.

    • Remove the access door from your iMac.

    • During reassembly, fasten the access door loosely and align it with the pocket cut into the outer case of the iMac before fully tightening the screws.

    • Before beginning, unplug your iMac and lay it on a soft surface as shown.

    • Stick a suction cup near each of the two top corners of the glass panel.

    • To attach the suction cups we sell, first position the suction cup with the movable handle parallel to the face of the glass panel. While lightly holding the suction cup against the glass, raise the movable handle until it is parallel with the other handle.

    • If your suction cups refuse to stick, try cleaning both the glass panel and the suction cup with a mild solvent.

  2. Gently lift the glass panel perpendicular to the face of the LCD enough to clear the steel mounting pins attached along the underside of the top edge of the glass panel. Pull the glass panel away from the lower edge of the iMac and carefully set it aside.
    • Gently lift the glass panel perpendicular to the face of the LCD enough to clear the steel mounting pins attached along the underside of the top edge of the glass panel.

    • Pull the glass panel away from the lower edge of the iMac and carefully set it aside.

    • During reinstallation, be sure to meticulously clean the inside of the glass panel and the face of the LCD as any dust or fingerprints trapped inside will be annoyingly visible when the machine is turned on.

  3. Remove the eight 8 mm T10 Torx screws securing the display to the outer case. The last two pictures are detail shots of each side of the display. The last two pictures are detail shots of each side of the display.
    • Remove the eight 8 mm T10 Torx screws securing the display to the outer case.

    • The last two pictures are detail shots of each side of the display.

  4. Slightly lift the top edge of the display out of the outer case.
    • Slightly lift the top edge of the display out of the outer case.

    • Do not lift it too much. There are several cables attaching the display to the logic board.

  5. Pull the vertical sync ribbon cable out of its socket on the LED driver board near the top left corner of your iMac. The vertical sync ribbon cable has a ZIF style end, but the socket has no lock or retaining flap. Simply pull the cable away from its socket toward the optical drive side of the iMac to disconnect it from the LED driver board. The vertical sync ribbon cable has a ZIF style end, but the socket has no lock or retaining flap. Simply pull the cable away from its socket toward the optical drive side of the iMac to disconnect it from the LED driver board.
    • Pull the vertical sync ribbon cable out of its socket on the LED driver board near the top left corner of your iMac.

    • The vertical sync ribbon cable has a ZIF style end, but the socket has no lock or retaining flap. Simply pull the cable away from its socket toward the optical drive side of the iMac to disconnect it from the LED driver board.

  6. Rotate the display out of the outer case enough to disconnect the LED backlight power cable from the LED driver board. Disconnect the LED backlight power cable by depressing the locking mechanism while pulling the connector away from its socket (toward the bottom edge of the iMac). Disconnect the LED backlight power cable by depressing the locking mechanism while pulling the connector away from its socket (toward the bottom edge of the iMac).
    • Rotate the display out of the outer case enough to disconnect the LED backlight power cable from the LED driver board.

    • Disconnect the LED backlight power cable by depressing the locking mechanism while pulling the connector away from its socket (toward the bottom edge of the iMac).

  7. Squeeze the two display data cable connector arms together to unlock it from its socket on the logic board.
    • Squeeze the two display data cable connector arms together to unlock it from its socket on the logic board.

    • Pull the display data cable connector away from its socket on the logic board.

    • Be careful when disconnecting and reconnecting this cable, as it is easily damaged.

  8. Disconnect the LCD thermal sensor cable connector from its socket on the logic board.
    • Disconnect the LCD thermal sensor cable connector from its socket on the logic board.

    • If your fan is spinning full speed after completion, check this connection or the hard drive's thermal sensor cable.

  9. Carefully pull the display toward the top edge of your iMac and lift it out of the outer case, minding any cables that may get caught.
    • Carefully pull the display toward the top edge of your iMac and lift it out of the outer case, minding any cables that may get caught.

  10. Remove the following four screws securing the power supply to the outer case:
    • Remove the following four screws securing the power supply to the outer case:

    • Two 22.2 mm fine-thread T10 Torx

    • One 25 mm coarse-thread T10 Torx

    • One 9 mm coarse-thread T10 Torx

    • The next few steps bring your hands close to the exposed face of the power supply. To avoid a high voltage shock from the many large capacitors attached to the board, do not touch the face of the power supply.

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

    • Disconnect the DC-In 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.

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

  13. Pull the optical drive thermal sensor connector straight away from its socket on the logic board.
    • Pull the optical drive thermal sensor connector straight away from its socket on the logic board.

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  15. Remove the four 9 mm T10 Torx screws securing the optical drive to the outer case.
    • Remove the four 9 mm T10 Torx screws securing the optical drive to the outer case.

  16. Lift the inner edge of the optical drive and maneuver its connector past the frame attached to the logic board.
    • Lift the inner edge of the optical drive and maneuver its connector past the frame attached to the logic board.

    • Carefully pull the optical drive off its mounting pins on the edge of the outer case to gain clearance for disconnecting the optical drive cable.

  17. Use the flat end of a spudger to help disconnect the optical drive cable.
    • Use the flat end of a spudger to help disconnect the optical drive cable.

  18. Remove the single 13 mm T10 Torx screw securing the optical drive fan to the outer case.
    • Remove the single 13 mm T10 Torx screw securing the optical drive fan to the outer case.

  19. Pull the optical drive off the pins attached to the outer case.
    • Pull the optical drive off the pins attached to the outer case.

  20. Pull the optical drive fan connector away from its socket on the logic board.
    • Pull the optical drive fan connector away from its socket on the logic board.

    • Remove the optical drive fan from the iMac.

  21. Pull the left and right speaker connectors toward the right side of the iMac to disconnect them from the logic board.
    • Pull the left and right speaker connectors toward the right side of the iMac to disconnect them from the logic board.

  22. Disconnect the audio port cable by pulling its connector toward the right side of the iMac.
    • Disconnect the audio port cable by pulling its connector toward the right side of the iMac.

  23. Disconnect the AirPort cable by lifting its connector off the socket on the logic board.
    • Disconnect the AirPort cable by lifting its connector off the socket on the logic board.

    • Lift the connector perpendicular to the face of the logic board.

  24. Disconnect the following cables by pulling their connectors toward the top edge of the iMac:
    • Disconnect the following cables by pulling their connectors toward the top edge of the iMac:

    • Camera cable

    • Hard drive thermal sensor

    • Hard drive fan

    • Microphone

    • Disconnect the following cables by pulling their connectors toward the right edge of the iMac:

    • Ambient temperature sensor

    • Bluetooth cable

  25. Disconnect the CPU fan and power button by pulling their connectors toward the left edge of the iMac.
    • Disconnect the CPU fan and power button by pulling their connectors toward the left edge of the iMac.

  26. If present, remove the piece of tape covering the IR sensor connector. Disconnect the IR sensor by pulling its connector toward the top edge of the iMac.
    • If present, remove the piece of tape covering the IR sensor connector.

    • Disconnect the IR sensor by pulling its connector toward the top edge of the iMac.

  27. Use your fingers to lift IR sensor assembly straight up out of the outer case.
    • Use your fingers to lift IR sensor assembly straight up out of the outer case.

  28. Remove the following six screws securing the logic board to the outer case:
    • Remove the following six screws securing the logic board to the outer case:

    • Three 25 mm T10 Torx

    • Two 21.5 mm T10 Torx

    • One 7 mm T10 Torx

  29. Remove the plastic ducts from the side of the LED driver board and the hard drive by pulling them away from the outer case. Remove the plastic ducts from the side of the LED driver board and the hard drive by pulling them away from the outer case.
    • Remove the plastic ducts from the side of the LED driver board and the hard drive by pulling them away from the outer case.

  30. Carefully remove the aluminum tape attaching the GPU heat sink to the outer case.
    • Carefully remove the aluminum tape attaching the GPU heat sink to the outer case.

    • It is not necessary to completely remove the aluminum tape from the GPU heat sink.

  31. In the following steps, you will maneuver the logic board out from the outer case. In doing so, be aware of the many cables still attaching the logic board to the outer case.
    • In the following steps, you will maneuver the logic board out from the outer case. In doing so, be aware of the many cables still attaching the logic board to the outer case.

    • Be sure the logic board clears the plastic lower optical drive fan mounting pin before lifting it up, as it is easily snapped off.

  32. Carefully pull the logic board slightly away from the outer case.
    • Carefully pull the logic board slightly away from the outer case.

    • While holding the board away from the outer case, rotate the board back and forth while lifting up to release it from the outer case.

  33. Now that the lower edge of the board is free from the outer case, rotate the logic board toward yourself to expose its rear face. The following connector has a tendency to stick in its socket. If so, insert a metal spudger into the gap between the connecter and its socket. Twist the spudger to separate the two components.
    • Now that the lower edge of the board is free from the outer case, rotate the logic board toward yourself to expose its rear face.

    • The following connector has a tendency to stick in its socket. If so, insert a metal spudger into the gap between the connecter and its socket. Twist the spudger to separate the two components.

    • Carefully pull the optical drive connector away from its socket on the logic board.

    • Pull the connector perpendicular to the face of the logic board.

  34. Disconnect the DC-In cable from the logic board by simultaneously depressing the locking lever on the connector while pulling it away from its socket.
    • Disconnect the DC-In cable from the logic board by simultaneously depressing the locking lever on the connector while pulling it away from its socket.

    • Remove the logic board from the outer case.

    • During reassembly of the logic board, pay attention to the position of the I/O connectors. When the board is back in the case, insert a USB or Thunderbolt cable into one of the connectors to align it perfectly.

  35. If present, remove the pieces of clear tape securing the ambient temperature sensor cable and the left speaker cable to the rear case.
    • If present, remove the pieces of clear tape securing the ambient temperature sensor cable and the left speaker cable to the rear case.

  36. Remove the two 13 mm T10 Torx screws securing the CPU fan to the outer case.
    • Remove the two 13 mm T10 Torx screws securing the CPU fan to the outer case.

  37. Peel the cable retainer off the side of the CPU fan.
    • Peel the cable retainer off the side of the CPU fan.

    • If the tape on the cable retainer loses adhesion, remove the existing foam tape and either use double-sided tape or glue to reattach it to the CPU fan.

    • Remove the CPU fan from the outer case, minding any cables that may get caught.

  38. De-route the left speaker cable from the clips securing it to the outer case.
    • De-route the left speaker cable from the clips securing it to the outer case.

  39. Carefully remove the left speaker and ambient temperature sensor cables from the CPU fan cable retainer. Carefully remove the left speaker and ambient temperature sensor cables from the CPU fan cable retainer.
    • Carefully remove the left speaker and ambient temperature sensor cables from the CPU fan cable retainer.

  40. Use the flat end of a spudger to pry open the ambient temperature sensor retainer. Remove the ambient temperature sensor from the CPU fan.
    • Use the flat end of a spudger to pry open the ambient temperature sensor retainer.

    • Remove the ambient temperature sensor from the CPU fan.

Ligne d'arrivée

2 autre(s) ont terminé cette réparation.

My iMac’s fans are running constantly, even at idle. I believe the temperatures that are being reported in iStatMenus are inaccurate.

I ran Apple Diagnostics test and received this error:

4SNS/1/40000000: TAOP-42.398

This error apparently means the ambient air sensor in my 2011 iMac is bad.

Would removing the ambient air sensor as shown in this guide prevent the fans from spinning so fast all the time?

aydoubleyou - Réponse

Look for a tool named “Mac Fan Control”, with that you can control the fan speeds manually or define which fan listens to which sensor.

I (or better our employes) would go crazy without that tool, since the most macs (over 60) in our company had a sensor fail sooner or later.

(i still can’t understand why such expensive hardware has so crappy components build in, some evil people say it is on purpose…)

Wolf -

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