iMac Intel 21.5" EMC 2308 Power Supply Replacement

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Use this guide to replace a faulty power supply.

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Heavy-Duty Suction Cups (Pair)

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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.

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.

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.

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.

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).

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.

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.

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.

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.

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.

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.