iMac Intel 27" EMC 2309 (Late 2009, Core 2 Duo 3.06 or 3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHz or Core i7 2.8 GHz) ID iMac11,1

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Broke vertical sync cable on reinstall... possible fix?

Hello everybody,

While reinstalling my display into my iMac, I broke one of the 4 thin strips of metal that comes out of the vertical sync cable. I only noticed this after restarting the computer and hearing a weird high-pitched ringing noise (and researching the issue, apparently this is a problem on many stock iMacs). The display itself appears to work fine, so I don't want to make things worse, but is it possible to cut the cable and strip the protective coating, making the cable viable again?


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Here is part I saw on Ebay




Took my late 2009 27" imac to the shop for hard drive issues and it failed so I decided to fix it myself and noticed a flashing folder when i started it up after stuffing that small connector in it's spot. I knew something was wrong but i put it together anyway...Didn't work so I opened it again and noticed that one of the tiny contacts was peeled back. I bent it back and re assembled it. I also found plenty of spare and NEW parts # 539-1049 v online @ eBay some for $6.00 free s/h. Make sure you buy the right kind mine ends with a "v" not "A"... But Yes they can be fixed and you'll need the right kind of tape Kapton tape. This tape is heat sensitive made for computers.


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After finding the part online (about $20 USD, not too bad) I decided I could mess around with the cable - I mean it's broken anyways, right?

So I cut off the part that was broken (all of the exposed part) and stripped away the other half of the end (the cable is stiff at the end, and half of that part is the original exposed part). Plugged that into my computer (with the hacked part monitor-side to make insertion and removal easier in the future) and it works! No high-pitched whining :)

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+ Thank you for coming back with the answer. I have never attempted to do what you were asking. It is good to know it is something that can be accomplished. By the way where did you find the part?


The cheapest available part was here:


Could you please elaborate further on how you did this? I have to do this after upgrading my hard drive also and have literally the same problems and same computer!


Craig you will get the attention you need and deserve by posting your own question about this


I really don't understand his proceeding, I'll have to try it my way some day.


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Hi, I had the same problem after installing a SSD instead of the optical drive. The pins of the vsync-cable were not broken but bent. The first day after the upgrade everything seemed fine, but on the second day the display went black. I opened up the imac and pulled the vsync out of it's slot and left it this way. At the moment everything seems to be all right again. Hope it lasts...

Best regards


Imac 27 inch, late 2009

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Adam Hintz will be eternally grateful.
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