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[GUIDE] Fix iMac flickering and dark screen problems out of warranty

55454 Views 170 Replies Latest reply: Apr 4, 2014 5:55 PM by NEO3663 RSS Branched to a new discussion.
  • zaNabiT Calculating status...

    Hi Jeff wai ng,


    I have the same problem with my mid 2011 imac...i want to ask you if the problem is finally solved  with your method? Do you have some photo to show us? Thx in advance.

  • jeff wai ng Calculating status...



    Yes, the problem is fixed now. I did not manage to take photo when I was doing it, but i am sure we are happy to help here if you can explain to us how far to get to now.


    i got to the connector, i tried gently pressing it, wiggle the connector, apply pressure with tape, nothing was helping. so i cut things up to remove the black cable (6 small wires) along with the white connector with you will see 6 teeth that stand straight up in the center and 1 smaller one on each side. that 2 on each side seems useless because you can see only 6 black wires. i used a small clipping tool and just gently bend the teeth so when i put it back it, it will have a better touch to the board.

  • yurikg1 Calculating status...

    Hey guys,


    I've got the same problem with my late 2009 iMac and I tried to follow the instructions from this thread - applying pressure on plug helped for only 2 days, then I decided to give a try with soldering option,  but this place is TINY, I don't even know which soldering gun could be suitable for this, I bought one with pretty small coppe-bit, but it didn't helped.  I made a big mistake by cutting the black cable (in order to connect it this with soldered cables) but it was too early. So I tried soldered it back and tried the solution with bent pins but it didn't help eirther :-(


    I asked a couple of friends here in Munich, who even repair Macs, but nobody knows how to solder in this place, and workshops refuse to solder it, they say that only option to solder is, to disassemble the casing, but it's to much work for them.


    Could you give me at least some hints how you did the soldering, it's actually the last option left for me, apart from buying the new LCD panel (and the new LCD panel will have potentially the same issue!).


    Thank you in advance,


  • MobaLA Calculating status...



    I have this problem with a 2011 iMac and tried to solder some cables to the connectors. Now it behaves strange: After booting the login screen appears with the same brightness all over the screen, even the left part works. But about 1 second later it just goes off and remains dark. Everything appears to be running correctly, only the backlight goes off.

    Did anyone already had this problem?

    Maybe I connected 2 cables by mistake but I couldn't find them yet.

  • John-Paul May Level 1 Level 1 (20 points)

    Hey Kaos !!


    Here's some exciting news ..  have a look at this post ...



    at one point they changed a stupid plug on the Controller Board, for no reason!


    So, if you get a new panel, you may very ell have this problem.


    (I was thinking "if only Kaos was here to weld this stupid little plug!"    Fortunately I was able to "merely" swap the controller boards.)


    (Note for anyone new to the thread - I don't mean "the" plug that causes problems on these displays. What I mean is that if you buy a new display perhaps from eBay, to swap out ... crazily at one point LG changed a small plug on the controller board of the display; this will cause you a big heartache when you try to swap panels. Its incredibly silly of them to change an internal plug like that, meaning you can't interchange the old/new parts (they are identical unchanged boards).)


    BTW here's a video showing the basic problem, for anyone new to the thread!


  • John-Paul May Level 1 Level 1 (20 points)

    Ok so I know of ONE MORE PANEL AVAILABLE right now in Europe, very cheap. (March 2013.)


    You can find it on eBay, LM270WQ1 and it is being sold by who are in northern Germany.


    They had two and I bought one!


    The one I bought is an A2 variant (see here for discussion of controllerBoard plug variants )


    Here's the box ...  the surgery .. and amazingly the finished working result.


    <a href='' target='_blank'><img src='' border='0' alt="a" /></a>

    <a href='' target='_blank'><img src='' border='0' alt="b" /></a><br /><br />

    <a href='' target='_blank'><img src='' border='0' alt="c" /></a> <br /><br />




    Essentially, I did not have the time (or skill !) to do KAOS' solution


    So unfortunately I had to spend the money on buying a panel from eBay.  (New panels from Apple ae way too expensive to make it worthwhile on a two year old computer.)


    One note with swapping panels.  Your new panel will not have the metal brackets around the outside. (These are just 50 cent bent metal brackets that are glued on the edges of the panel.) I actually just found it too annoying to pull the brackets off the unused panel, so, I just didn't bother. (To be clear it would take you maybe one minute to do this, I just couldn't be bothered.)  So, I simply haven't bothered screwing in the new working panel.  There is actually almost no need to screw in the panel on an iMac - they sit there fine behind the magnetized glass front, unless you need to tip your iMac upside down!  I prefer to be ble to get in to the iMac at any time to swap the drive or whatever, so I personally have never bothered even putting the screws in. For this reason I just didn't bother even pulling the brackets off the other one (also, I don't like glue!)


    And again, in my case since the LM270WQ1 panel I got from eBay was an A2, but my Aug2010 Mac happened to have a C2 ... I had to swap the controller board, which is annoying, but detailed at the macrumors link above.  Again, the controllerBoards are utterly identical, but LG annoyingly changed a small plug used on them.  For this reason, you have to swap the controllerBoard!!  (I guess, if you could find the "other type" of cable, or a plug adaptor - you could do that.  KAOS, you could probably swap the plugs I bet.)


    All thanks to KAOS for properly figuring out this problem, saved me $1000. Thank you so much, really.

  • John-Paul May Level 1 Level 1 (20 points)

    Here's the surgery and the finished working Mac, thanks goodness...



  • John-Paul May Level 1 Level 1 (20 points)

    Fixed at last ...



  • John-Paul May Level 1 Level 1 (20 points)

    right !


    " I can't really notice if the "pin-out" is the same as on the white one."


    To be clear, I did NOT HAVE a male plug for the C2 "white" plug.  I had only my "black"  A2 plug.


    The shape is very different.


    So fo rme, I had to swap the boards.  I guess this is easy enough: it is just scary (for me) to change the ribbon cable.  But, thank God, it all worked out.  (I guess the new Pope helped    Even though I'm not catholic, Francis loves all animals and computers!)


    Thank you again, you are #1 !  I thought I would have to send you my Mac to Spain to have it fixed!  I would have done it but I could not find cheaper than about €80 to ship a mac.


    It is an incredible waste my other display is just throw out.  (My children destroyed it playing with it when I took it out    )  All because of one loose tiny plug.

  • cYrEaD Level 1 Level 1 (0 points)

    I tried to solder this myself, and didn't succeed.  I got 3 of the wires soldered in there, but couldn't get the others because it was just too tight, even with the finest tip I could buy on my iron, a good well lit magnifying glass, pre fluxing the contacts, hours of meticulous attempts that ended up just making a mess in that connector socket...


    Then I got ******.  Worked my way up the service higherarchy on the tele with apple support.  finally some regional service manager made me an appointment at the local apple store - 40 miles away in Anchorage, AK.  Got to the apple store and was told I didn't have an appointment.  Then was told (after turning the computer on and showing them the half dark screen and pointing them to this feed) that it would cost $600.  I just said no - I'm not paying that nor am I leaving the store till they make it right.  The manager came over and signed off on the replacement at no cost.  Then I was told there was a 3 week backorder of 27" screens probably because everyone is having failures.  eventually after carrying the giant f'n computer back and forth to the apple store 3 times it was replaced at no cost.  And they did the seagate 1tb drive recall work as well which I didn't know about prior to that visit...

  • John-Paul May Level 1 Level 1 (20 points)

    So glad to hear you got satisfaction !!!


    It ***** that their response is so erratic .. they seem to be giving in more and more.  Congrats.


    the new screen is awesome huh?    Hurts my eyes it is so bright.

  • yurikg1 Level 1 Level 1 (0 points)

    I also tried to solder myself and Kaos even recommended the appropriate tool but I didn't succeed. So it's really frustrating, I asked many workshops here in Munich, but nobody want to solder.


    And it's very hard to find appropriate replacement lcd (LM270WQ1 A2), Apple doesn't sell replacement parts to individuals (why not?) and neither the serivice providers do. And I'm sort of wary of buying some A/B-grades repaired parts from eBay.


    I know that it's not the place for these sort of complaints, but this iMac has quite a bunch of issues and Apple's feedback is just frustrating, the lcd issue was very well known and a lot of people are affected, I paid 2.000 euros for this machine and after more of 10 years Mac experience it's definitely the last iMac and maybe the last Apple computer I bought...

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