Ideas to repair lcd screen on 27" iMac late 2013

Discussion in 'iMac' started by williah, Aug 13, 2017.

  1. williah macrumors newbie

    Joined:
    Jan 9, 2014
    #1
    So I opened up my late 2013 iMac, removing the lcd screen, to access the inside (I followed a youtube vid and online guide). Everything seemed to be going well until I reconnected the screen. When I plugged it in I got the "lit up" black screen but with 3 new grey bands running top to bottom (screen pict 1).
    When the computer starts booting up, the screen is white and the bands are black (screen pict 2). After that I get the three black bands permanently blocking the screen (there is no image across them at all).

    Obviously I've damaged something taking it apart or reconnecting it. I'm wondering if anyone has experience with this and would know the more likely cause. Would this be a bad cable, where I damaged the plugs reconnecting or would this more likely be damage to the screen itself?
    If its the screen, would it be to the glass front panel ($50), or something else needing a new screen ($500). Any manuals or references/books on screen repair would be appreciated as well. I'm contemplating buying the glass front and rebuilding it (cheapest first attempt) but have no idea what's involved.

    Any info would be appreciated.
     

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  2. nambuccaheadsau, Aug 13, 2017
    Last edited: Aug 13, 2017

    nambuccaheadsau macrumors 6502a

    nambuccaheadsau

    Joined:
    Oct 19, 2007
    Location:
    Nambucca Heads Australia
    #2
    From the look of things it may well be the gold connectors on the data cable you connected up as you closed the screen. They are very fragile. A friend of mine is a large Apple Reseller in Sydney, Australia, and does not let his technicians crack the glued iMacs, but sends them off to Apple for this. Four or five broken screens at $500 a pop was enough for him.

    Have a look at this from ifixit step 19.


    https://www.ifixit.com/Guide/iMac+Intel+27-Inch+EMC+2639+Display+Replacement/19632
     
  3. williah thread starter macrumors newbie

    Joined:
    Jan 9, 2014
    #3
    Thanks, Nambucca Heads. The link you provided is one of the references I used.

    My first guess was that I damaged one of the connectors. They are very small, and I'm guessing fragile, and that I damaged a pin while removing or connecting. It's the only step I recall having difficulty or concern with while removing the screen.
    I'm going to get replacement connectors and try that. Hopefully that's the problem and not the screen itself.

    One quick screen question for anyone who might know iMac lcd screens - I did run the pick along the bottom of the screen to remove the adhesive there. It's the only place where I made contact with anything other than the edge of the screen. Does anyone know if there are contacts along the bottom edge, that might have been damaged and would cause these dark areas? My logic says that the info for these bands isn't getting through to the screen from the mainboard, and that the contacts related to it are damaged. Hence, the data cable or some other contacts along the screen are at fault. Anyone?
     
  4. _Kiki_ macrumors 6502

    Joined:
    Aug 13, 2017
    #4
    you can't replace only glass in iMac 27" Slim, front glass is coming with whole screen and is very expensive, you can try replace only cable - part number 923-0308

    Can you tell me the reason, why you opened iMac ?
     
  5. williah thread starter macrumors newbie

    Joined:
    Jan 9, 2014
    #5
    Yes, I was looking to upgrade my HDD. I removed the screen as a "test," to confirm the procedure. Now it's confirmed, and I'm working on the repair.
     
  6. b06tmm macrumors regular

    b06tmm

    Joined:
    Jul 23, 2009
    Location:
    South Louisiana
    #6
    I damaged the LVDS cable when I opened my mid-2011 27" and all I got was a black screen and the fan running full blast.
     
  7. Fishrrman macrumors G4

    Joined:
    Feb 20, 2009
    #7
    Such are the risks of opening an iMac.

    That's why I advise users -not- to be foolin' with the insides, and why a USB3 external drive is often the "easiest, safest, fastest" way to upgrade their drive capabilities... :(
     
  8. williah, Aug 15, 2017
    Last edited: Aug 15, 2017

    williah thread starter macrumors newbie

    Joined:
    Jan 9, 2014
    #8
    Thanks for the recommendation Fishrrman, and I pass it on whole-heartedly to any who doesn't want to take on the risk, responsibility and accident-repair costs for their computers. I personally have been working with and opening my iMacs and pcs for years. I knew when I opened it there was risk involved, and am prepared to deal with the costs of this.

    I am currently looking for advice and recommendations for the repair of the problem, and some possible insight from those who may have gone through the issues themselves, though I do appreciate your recommendations about taking on the risk.
    --- Post Merged, Aug 15, 2017 ---
    Kiki, the reason I asked about the glass is because I found it listed online separately as an available part. I wondered if anyone had information on the steps, difficulty and procedures on taking the screen apart (if it was even, truly possible). Do you know for sure (no offense) that it can't be taken apart? If you're sure, then why, do you think the glass is available as a separate part? Let me add, I'm an e-tinkerer, I enjoy taking apart, analyzing and rebuilding electronics and equipment. Some things can't be disassembled, some can and I'm always on the look out for the answers.
     
  9. opeter macrumors 65816

    opeter

    Joined:
    Aug 5, 2007
    Location:
    Slovenia, EU
    #9
    I opened six iMacs (2012-2015) so far, never had a problem like this. You must be gently with the iMac, you know?
     
  10. _Kiki_ macrumors 6502

    Joined:
    Aug 13, 2017
    #10
    if you are sure, show me links on eBay to glass for Slim models 27"

    also why you think the glass will solve the problem with faulty electronics inside LCD panel ?
     
  11. opeter macrumors 65816

    opeter

    Joined:
    Aug 5, 2007
    Location:
    Slovenia, EU
    #11
    The glass is fused/glued to the sceen since the late 2012 models, so if you need to change the broken glass, you need to replace the whole display.
     
  12. andrew.gasiorowski macrumors newbie

    Joined:
    Aug 20, 2017
    #12
    Just out of interest, did your Mac chime when you powered it on when this was happening?
     
  13. b06tmm macrumors regular

    b06tmm

    Joined:
    Jul 23, 2009
    Location:
    South Louisiana
    #13
    I don't think so, just the black screen and the fans running on full.

    I opened mine up because my graphics card failed and I wanted to try baking it in the oven. I baked the card and buttoned everything up and that's when I got the black screen and fans. I read where a bunch of other folks had this same issue and the new cable fixed it.
     

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