iMac Intel 21.5" EMC 2389 Power Supply Replacement

Replace the power supply in your iMac Intel 21.5" EMC 2389.

Use this guide to replace your iMac's power supply.

Sections

Edit Step 1 Glass Panel  ¶ 

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Edit Step 1 Glass Panel  ¶ 

  • 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.

Edit Step 2  ¶ 

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Edit Step 2  ¶ 

  • 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.

Edit Step 3 Display  ¶ 

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Edit Step 3 Display  ¶ 

  • Remove the eight 8 mm T10 Torx screws securing the display to the outer case.

    • The last two pictures are detail shots of each side of the display.

Edit Step 4  ¶ 

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Edit Step 4  ¶ 

  • 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.

Edit Step 5  ¶ 

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Edit Step 5  ¶ 

  • Pull the vertical sync cable connector out of its socket on the LED driver board near the top left corner of your iMac.

Edit Step 6  ¶ 

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Edit Step 6  ¶ 

  • 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).

Edit Step 7  ¶ 

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Edit Step 7  ¶ 

  • Grab the plastic pull tab secured to the display data cable lock and rotate it towards upwards.

  • Pull the display data cable straight out of its socket on the logic board.

  • Do not lift up on the display data cable, as its socket is very fragile. Pull the cable parallel to the face of the logic board.

Edit Step 8  ¶ 

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Edit Step 8  ¶ 

  • 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.

Edit Step 9  ¶ 

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Edit Step 9  ¶ 

  • 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.

Edit Step 10 Power Supply  ¶ 

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Edit Step 10 Power Supply  ¶ 

  • 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.

  • Remove the following four screws securing the power supply to the outer case:

    • One 9.3 mm T10 coarse-threaded screw

    • One 25 mm T10 coarse-threaded screw

    • Two 22 mm fine-threaded screws

Edit Step 11  ¶ 

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Edit Step 11  ¶ 

  • 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.

Edit Step 12  ¶ 

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Edit Step 12  ¶ 

  • 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.

  • 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.

  • Once the locking mechanism has cleared the socket, pull the DC-In connector away from the power supply.

Edit Step 13  ¶ 

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Edit Step 13  ¶ 

  • 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.

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

For more information, check out the iMac Intel 21.5" EMC 2389 device page.

Required Tools

TR10 Torx Security Screwdriver

$1.95 · 50+ In stock

Heavy-Duty Suction Cups (Pair)

$14.95 · 50+ In stock

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Comments Comments are onturn off

Change "Before beginning, unplug your iMac and lay it on a soft surface as shown." to "Lay your iMac on a soft surface as shown"

Henry Barnett, · Reply

my imac power sullye not powering

tahir, · Reply

imac 2544 2.5 core i5 i touched the motherboard to supply and it spark now it is not powering

please tell me the directions

thanks witting for answering .

tahir, · Reply

Im sorry to say, If it sparked when you touched it your motherboard s now fried. You need a new one.

Robert Wacker,

Very easy to lift the glass out. Don't jerk too hard.

kctipton, · Reply

Success replacing the stock ST31000528AS with a STBD3000100 (Dead 1TB to new 3TB, both Seagate). First try. Using another Mac and a quality Firewire 800 cable, I formatted it using Target Disk mode, 2 partitions (defaults, except I made the first one bigger than the second). To the second, smaller one, I copied a bootable Install OS X Mavericks partition. Tried to boot. It booted, and I installed; nary a glitch. (Running the Installer over Firewire would have been faster, but I didn't want to reboot this machine.)

See part 2 below...

Matthew Elvey, · Reply

(Part 2:)

I SKIPPED steps 6, 7 AND 8! Instead, after doing Step 5, I noticed I then had enough room and cable length to access the screws in Step 11 if I lifted the LCD up an inch or so, rotated it about 20-30 degrees clockwise and moved it a couple inches toward the base, and put it down. After removing them (Step 11), I propped up the LCD (with a spare spudger) and had enough room to do Steps 12, 13, and 14 without much difficulty. Felt safer/less work and risk than not skipping steps 6-8. No risk of the damage Ersan and Michael caused performing Step 7!

Matthew Elvey,

I just edited that step to add a note about the shortcut.

Matthew Elvey,

What the ???

Geoff Wacker has REJECTED my edit: https://www.ifixit.com/Guide/history/ste...

I wonder why. What's the deal, Geoff? I mean I'd understand if I suggested folks didn't need the suction cups, as that could cut into iFixit's income stream, but what's wrong with suggesting that a few steps aren't needed? It worked for me; the EMC 2389 I fixed is humming along with a new 3TB HD I installed while skipping those steps.

Matthew Elvey,

I did not have to remove a single cable! After undoing the torx screws from the sides, I was able to rotate the LCD out of the way enough to reach all the screws holding in the ODD bracket. One of them was a bit challenging to get to, but I never felt that I was risking the cables by leaving them connected. Also, it wasn't totally clear, but you have to actually remove the ODD itself from the ODD bracket - 4 torx screws. The SDD mounts into the hard drive enclosure, then the enclosure is screwed into the bracket. Those holes (enclosure <-> Bracket) did not line up correctly for me, and I had to go with only three of them connected in the end. Seems to work fine.

cdansmith1, · Reply

Another comment on DATA & LCD Temp. Sensor cables: I had to remove the vertical sync, and the backlight cable, however, if you have an assistant or/can carefully rotate the screen clockwise/and then have it held up about 5" to 6" at a slight angle, you do not need to remove LCD data cable or LCD thermal cable, however - IMPORTANT: you must have a second pair of hands/or way to securely prop up the LCD. Also, don't rotate too much, since then you will pull out LCD data cable, and it renders the whole exercise moot, or can damage the cable or connector.

MaximBorzov, · Reply

You don't need suction cups. The screen, held by magnets, can simply be pried off using a very thin blade such as a screw driver and fingers.

Deepsurvival, · Reply

Do not try to pull the plug off the circuit board as it's soldered. Pull the cable sideways out of the socket.

Alex Campbell, · Reply

This cable is very short, I would remove it before any of the others. First time I did this, I didn't realize this and this cable just popped out of it's socket. Luckily, the board wasn't damaged.

maccentric, · Reply

i damaged my (step7) cable, and my iMac screen won't work, how to fix this?

Ersan Rasubala, · Reply

I did the same thing. The pins are VERY easy to bend. I replaced it with a new cable from this company.

http://www.macpalace.com/922-9497-cable-...

Waiting for it to arrive.

Michael,

I wish this step was listed as a warning before lifting the monitor and as the first cable to undo. I broke it as it popped up and out, had to trash my Mac and I am stuck with a new hard drive.

Frank1701a, · Reply

I followed the directions to a T and everything worked going back together. That cable in step 7 is delicate so one must be very careful.

dustynnelson,

Same problem for me. I damaged this cable and am ordering one now.

This is a tough step so I would also suggest removing this cable first.

lyleberman, · Reply

Ok finally got the cable and was able to successfully finish the project.

That video cable is ROUGH to install.

lyleberman, · Reply

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