Imac G3 Model M4984 Power Supply Replacement Repair Guide

Difficulty

Moderate

Steps

Time Required

                          15 minutes - 1 hour

Sections

Logic Board
8 steps
Power Supply
7 steps

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Introduction

What you need

Step 1

              Logic Board

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.

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Step 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.

Step 3

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.

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.

Step 4

Now, remove the DB-15 Video connector from the logic board.
It may be helpful to use a Phillips screwdriver to remove the thumbscrews.

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

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

Step 5

Remove the power cable from the logic board assembly.

Remove the power cable from the logic board assembly.

Step 6

Remove the front panel connector. (You may also need to remove an additional screw that connects the front panel connector to the logic board assembly).

Remove the front panel connector. (You may also need to remove an additional screw that connects the front panel connector to the logic board assembly).

Step 7

Now, remove these Phillips screws.
Now, grab the logic board assembly by the piece of plastic, and lift it out.

Now, remove these Phillips screws.

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

Step 8

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.

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.

Step 9

              Power Supply

Now, remove these screws.
Now, lift the bottom cover off.

Now, remove these screws.

Now, lift the bottom cover off.

Step 10

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.

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.

Step 11

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.

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.

Step 12

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

Removing the EMI Shield:

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

Step 13

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.

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.

Step 14

Remove these three screws.

Remove these three screws.

Step 15

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.

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.

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

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                    Chris Green

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richiezuniga3 - Mar 3, 2020

i have exactly this problem with my vintage imac g3 took it to repair shop they said could not find it do you know where i can get this power supply and pay to have it installed

Introduction#

What you need#

Team#

Introduction

What you need

Team