Introduction

The iMac uses an incredibly hard to get to power supply. It has 24-Pins. This will require taking the iMac fully apart.

  1. The iMac G3. This was a great computer for the time, and had plenty of features.
    • The iMac G3. This was a great computer for the time, and had plenty of features.

    Add Comment

  2. Start by flipping the iMac upside-down. It may help to lay it on a towel, so you don't damage the screen, or scratch the face.
    • Start by flipping the iMac upside-down. It may help to lay it on a towel, so you don't damage the screen, or scratch the face.

    Add Comment

    • Remove this Phillips screw.

    • Using a flathead screwdriver, work your way around the bottom cover, until it comes off.

    • Then, lift the bottom cover up and out, and set it aside.

    Add Comment

    • Now, remove the DB-15 Video connector from the logic board.

    • It may be helpful to use a Phillips screwdriver to remove the thumbscrews.

    Add Comment

    • Remove the power cable from the logic board assembly.

    Add Comment

    • Remove the front panel connector.

    Add Comment

    • Now, remove these Phillips screws.

    • Now, grab the logic board assembly by the piece of plastic, and lift it out.

    Add Comment

    • The logic board assembly. This is the heart of the computer, it contains the motherboard, CPU, RAM, V-RAM, PRAM battery, the hard drive, and the optical drive.

    Add Comment

    • Now, remove these screws.

    • Now, lift the bottom cover off.

    Add Comment

    • Removing the front bezel:

    • There isn't a great position to put the iMac in to remove the front bezel. I recommend flipping it so it it like it would normally be positioned.

    • Remove these two Phillips screws.

    • Now, work your way around the bezel with a flathead screwdriver, and then, pivot it up towards the top, and remove it.

    Add Comment

    • Removing the translucent plastic:

    • Removal of the front bezel will reveal two screw covers on the top, pop them off with a Phillips screwdriver.

    • Now, use a Phillips screwdriver to remove the screws.

    • You can now remove the plastic.

    Add Comment

    • Removing the EMI Shield:

    • Remove all 10 of these screws, and lift the EMI Shield off.

    Add Comment

    • Power Supply:

    • Removal of the EMI shield will reveal two major circuit boards.

    • The Display Driver:

    • The Power Supply:

    • The power supply and driver board are dangerous, if you do not know what you are doing, you could severely injure or kill yourself.

    Add Comment

    • Remove these three screws.

    Add Comment

    • Now, swing the board out, and remove the following connectors:

    • AC Power

    • To System Fan

    • Don't remove this. It comes free with the logic board power.

    • To Display Driver

    • The connector that is attatched to the logic board; to remove it, simply thread it through the hole in the metal:

    • Now, you should be able to remove the power supply.

    Add Comment

Conclusion

To reassemble your device, follow these instructions in reverse order.

3 other people completed this guide.

Chris Green

Member since: 10/11/2009

32,579 Reputation

45 Guides authored

Team

Master Techs Member of Master Techs

Community

278 Members

755 Guides authored

0 Comments

Add Comment

View Statistics:

Past 24 Hours: 1

Past 7 Days: 8

Past 30 Days: 48

All Time: 14,462