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Use this guide to replace a faulty power supply.
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Stick a suction cup near each of the two top corners of the glass panel.
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If your suction cups refuse to stick, try cleaning both the glass panel and the suction cup with a mild solvent.
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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.
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Pull the glass panel away from the lower edge of the iMac and carefully set it aside.
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Remove the eight 8 mm T10 Torx screws securing the display to the outer case.
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Slightly lift the top edge of the display out of the outer case.
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Pull the vertical sync cable connector out of its socket on the LED driver board near the top left corner of your iMac.
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Rotate the display out of the outer case enough to disconnect the LED backlight power cable from the LED driver board.
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Grab the plastic pull tab secured to the display data cable lock and rotate it towards upwards.
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Pull the display data cable straight out of its socket on the logic board.
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Disconnect the LCD thermal sensor cable connector from its socket on the logic board.
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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.
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Remove the following four screws securing the power supply to the outer case:
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One 9.3 mm T10 coarse-threaded screw
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One 25 mm T10 coarse-threaded screw
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Two 22 mm T10 fine-threaded screws
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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.
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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.
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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.
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Once the locking mechanism has cleared the socket, pull the DC-Out connector away from the power supply.
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Disconnect the AC-In cable by depressing the locking mechanism while pulling the connector away from its socket.
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Remove the power supply from the outer case.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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I avoided this repair for a while. My iMac would not turn on, no fans or response of any kind from pushing the power button. Reapir took me less than 30 minutes and was very straight forward.
is there a fuse in the PCB where it can be replaced instead of replacing the whole power supply unit?
Excellent guide! Also watched the video, then dove right in. 27 minutes later my iMac was up and running!
What video? I do not see any video on this page. Could you please share the link?
Thank you
It took me like 20 minutes to replace the power supply. Having somebody hold the display unit while disconnecting/connecting the underneath cables was a big help ;)....and a flashlight to see better inside.
