Introduction

The ins and outs of replacing your DC to DC board.

Image 1/1: Loosen the two Phillips screws securing the access door to your iMac.
  • Before you work on the computer, unplug the computer and press the power button for 20-30 seconds to drain the stored energy in the power supply.

  • Loosen the two Phillips screws securing the access door to your iMac.

  • These screws are captive in the access door.

Add Comment

Image 1/1:
  • Remove the access door from your iMac.

Add Comment

Image 1/1:
  • Remove the three T8 Torx screws securing the front bezel to the rear panel.

Add Comment

Image 1/2: Use your thumbs to press both RAM arms in past the front bezel for enough clearance to lift it off the rear case. Image 2/2: Use your thumbs to press both RAM arms in past the front bezel for enough clearance to lift it off the rear case.
  • Orient the iMac face-up, on its backside.

  • Use your thumbs to press both RAM arms in past the front bezel for enough clearance to lift it off the rear case.

Add Comment

Image 1/1:
  • While holding the RAM arms in with your thumbs, lift the lower edge of the front bezel enough to clear the rear case.

Add Comment

Image 1/3: Insert a plastic card up into the corner of the air vent slot at the top of the rear case. Image 2/3: Push the card toward the top of the iMac to release the front bezel latch. Image 3/3: Pull the front bezel away from the rear case.
  • Re-orient your iMac so it sits upright on the stand.

  • Insert a plastic card up into the corner of the air vent slot at the top of the rear case.

  • Push the card toward the top of the iMac to release the front bezel latch.

  • Pull the front bezel away from the rear case.

  • Repeat this process for the other side of the front bezel.

  • It may be necessary to apply several layers of duct tape to the top of the access card to aid in releasing the latches.

  • If the bezel refuses to release, try pressing the lower edge back onto the rear case and repeat this opening process.

Using a strongish magnet will grab and release the latches.

darkstar448 - Reply

Quote from darkstar448:

Using a strongish magnet will grab and release the latches.

Are you sure it's safe to do this? How close is the hard drive, won't magnets interfere with it?

Sarah - Reply

It's almost certainly fine. Modern hard drives are very resistant to magnetic fields.

zschroeder6212 -

Image 1/1: Lift the front bezel from its lower edge and rotate it away from the rest of your iMac, minding the RAM arms that may get caught.
  • Lay your iMac stand-side down on a table.

  • Lift the front bezel from its lower edge and rotate it away from the rest of your iMac, minding the RAM arms that may get caught.

  • Lay the front bezel above the rest of the iMac.

Add Comment

Image 1/1:
  • If necessary, remove the piece of kapton tape wrapped around the microphone and camera cables.

Add Comment

Image 1/2: Image 2/2:
  • Disconnect both the camera and microphone cables.

Add Comment

Image 1/1: It is not necessary to peel the EMI shield off the display.
  • Peel back the aluminum EMI shield up off the lower three edges of the rear case.

  • It is not necessary to peel the EMI shield off the display.

  • We found it helpful to tape the EMI shield up against the display to keep it out of the way.

Add Comment

Image 1/2: Using its attached black tab, pull the display data cable connector up off the logic board. Image 2/2: Using its attached black tab, pull the display data cable connector up off the logic board.
  • Remove the two 5 mm T6 Torx screws securing the display data cable to the logic board.

  • Using its attached black tab, pull the display data cable connector up off the logic board.

Add Comment

Image 1/1:
  • Pull the inverter cable connector up off its socket on the logic board.

Add Comment

Image 1/1: During reassembly, it is helpful to use several small strips of tape to hold the EMI shielding along the left and right edges of the display footprint out of the way before lowering the display into the rear case of your iMac.
  • Peel back the aluminum EMI tape from the two vertical edges of the display.

  • During reassembly, it is helpful to use several small strips of tape to hold the EMI shielding along the left and right edges of the display footprint out of the way before lowering the display into the rear case of your iMac.

Add Comment

Image 1/2: These screws are recessed, so a thin screwdriver such as [product|IF145-014|this] is essential for removal. Bit drivers tend to be too short for this application. Image 2/2: These screws are recessed, so a thin screwdriver such as [product|IF145-014|this] is essential for removal. Bit drivers tend to be too short for this application.
  • Remove the four recessed coarse-thread 7.5 mm T10 Torx screws securing the display to the rear case.

  • These screws are recessed, so a thin screwdriver such as this is essential for removal. Bit drivers tend to be too short for this application.

No problem taking those screws off, HUGE problem trying to put them back in. Reassembling this step is a lot more complicated. Those 4 screws are impossible to reinstall if you don't have a magnetized screwdriver, which I don't.

javier - Reply

I used some 'chapstik' on my t10 driver and it held the screws long enough to insert them.

aquarianknows -

Quote from javier:

No problem taking those screws off, HUGE problem trying to put them back in. Reassembling this step is a lot more complicated. Those 4 screws are impossible to reinstall if you don't have a magnetized screwdriver, which I don't.

Since I could not get a hold on a nice magnetized T10, I inverted the whole unit and worked upside down to avoid lost screws inside an iMac.

javier - Reply

Quote from javier:

Since I could not get a hold on a nice magnetized T10, I inverted the whole unit and worked upside down to avoid lost screws inside an iMac.

Great, now my problem is to find a new cable that connects the panel to LB.

I'm from Italy and nobody has got it .

Please help me

Thanks for all

Carlo

Lars - Reply

I found a group of wires not mentioned on the instructions along the underside of the display at the right. They were connected to something at the right bottom of the display near the white plastic piece. I am unable to raise the display more than a couple of inches at this side of it and am wondering what do do.

modorange - Reply

The group of wires on the right side of the display is the inverter. Seems like a few steps were omitted, so I'll try to fill in the gaps. Use the T10 to remove the right speaker. It's the big white plastic squarish thing on the bottom right side of the iMac. It pulls stright up and you can either disconnect it or just leave it hanging. This should release the inverter cable from hanging up the right side of the display (it did for me, even disconnecting the inverter didn't help as the cable was under the speaker, the inverter doesn't need to be disconnected but it might be helpful to disentangle things and it's an easy one to take apart). The other step missing is to remove the perforated tape at the top of the LCD from the LCD, otherwise you can't really remove it. I found a spudger helpful for this task.

I know it's a couple years since the OP posted, but hope this helps someone.

Cheers

Jeff Kamis

maccentric -

I've found that 'coating' the tip of the screwdriver with glue from a glue-stick will help to keep the screws from coming off of a non-magnetized driver.

Henry in StL - Reply

Image 1/1: Be mindful of any cables that may get caught during removal.
  • Lift the display from its lower edge and pull it toward yourself to peel it off the EMI shield attached to its top edge.

  • Be mindful of any cables that may get caught during removal.

Add Comment

Image 1/1: Wiggling the connector while pulling it aids in removal.
  • Pull the DC power cable connector away from its socket to disconnect it from the DC to DC board.

  • Wiggling the connector while pulling it aids in removal.

Add Comment

Image 1/1: Pull the power supply cable connector away from its socket to disconnect it from the DC to DC board.
  • This step brings your hands close to the exposed face of the power supply. Do not touch the face of the power supply to avoid a high voltage shock from the many large capacitors attached to the board.

  • Pull the power supply cable connector away from its socket to disconnect it from the DC to DC board.

  • Wiggling the connector while pulling it aids in removal.

Add Comment

Image 1/1: The short fine-thread screw belongs in the upper right corner and the black coarse-thread screw belongs in the lower right corner of the DC to DC board.
  • Remove the three T10 Torx screws from the DC to DC board.

  • The short fine-thread screw belongs in the upper right corner and the black coarse-thread screw belongs in the lower right corner of the DC to DC board.

Add Comment

Image 1/1:
  • Lift the DC to DC board out of the rear case.

Add Comment

Conclusion

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

2 other people completed this guide.

Team

iFixit Member of iFixit

Community

126 Members

5,876 Guides authored

0 Comments

Add Comment

View Statistics:

Past 24 Hours: 0

Past 7 Days: 2

Past 30 Days: 66

All Time: 5,804