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Horizontal Lines appear in random spots on display

52461 Views 115 Replies Latest reply: Oct 9, 2010 9:42 AM by Dave13 RSS
  • Frederic BOTTARO Calculating status...
    Hi,

    Just replying to myself...
    It is not the Bluetooth module.
    Too bad.

    It happens pretty often now. Just impossible to even think about watching a movie or play WoW without having a complete machine freeze.

    Now, I really hate this "all-in-one" concept that forces me to change the whole machine instead of just a part of it. Of course, I could take it to an Apple center... but the part change would cost about a new machine !

    Regards.

    FRED
    PowerMac G4 Dual 1,25 GHz ; PowerBook G4 1Ghz, Mac OS X (10.3.x)
  • teh phil Calculating status...
    Same problem here, guys, but I get this too:




    Really makes me wish I had gotten AppleCare, but I may just have to live with this problem because I'm sure the Apple "fix" will cost a pretty penny.
    iMac 24", Mac OS X (10.5.5)
  • gerrard727 Level 1 Level 1 (0 points)
    I have the LCD panel LM171W02-TLB2 for Intel based 17" iMac, please contact me if you need one, my email: gerrard727@yahoo.com.hk
    Intel 17" iMac, Mac OS X (10.4.11)
  • gerrard727 Level 1 Level 1 (0 points)
    Here are the sample photos:




    Please contact me for details: gerrard727@yahoo.com.hk
    Intel 17" iMac, Mac OS X (10.4.11)
  • Chris Blackwell1 Calculating status...
    Glad it's not just me!

    I have a 2006 24" iMac running Tiger 10.4.11 and I've been having all of the symptoms described. Last night QuickTime began to sieze up too, freezing the entire machine several times. I was about to order a new 24" iMac today but on reading about smcFanControl I have downloaded it and will wait to see if the problem persists before reaching for my credit card.

    My iMac is on all the time so heat could very easily be an issue. We shall see!
    Intel 24" iMac, Mac OS X (10.4.11)
  • Chris Blackwell1 Level 1 Level 1 (35 points)
    At 2000rpm the temperature has now dropped to 32 degrees from 41.

    What annoys me though is that I never had this problem until about 3 Months ago which leads me to suspect it's more than just a heat issue. It was working fine until then.
    Intel 24" iMac, Mac OS X (10.4.11)
  • Ken Peck Calculating status...
    Thanks to everyone for their posts on this topic.

    Like many of you, I have been getting apparently randomly appearing horizontal lines appearing in my windows. As well, this has only been occurring in the last few months.

    When smcfancontrol brings the temp below 45 C or so, the lines disappear! The temp climbs above 45 C, the lines begin to appear again. Several kernel panics and crashes have also occurred before I discovered the fan control option.

    Something's up, and needs to be fixed.
    iMac 20", Intel Core Duo 2 Ghz, Mac OS X (10.5.5)
  • darrickF Calculating status...
    Just wanted to chime in on this topic - I finally discovered it after much searching and troubleshooting my iMac with graphic artifacts/freezing issues.

    I'm grateful that the fan bumping seems to solve the issue however I am decidedly unhappy about Apple not repairing/replacing what is obviously not a user related issue but a software as it is related to its own hardware issue.

    Apple: fix the friggin' heat issues. I can cook eggs on my Apple tv for cryin' out loud. Sheesh.
    2.4 GHz LED Macbook | 2.16 GHz White 24" iMac | iPhone | Apple tv, Mac OS X (10.5.5)
  • Craig Fletcher Calculating status...
    Hello Everyone,

    I also have a 2006 Intel iMac and have been dealing with the freezes, lines and tearing for over a year now. I did not get Apple Care and so regret it!! I have been using SMC fan controller and it helps but I still get artifacts and occasional freezes. I am so disappointed that Apple will not fix this problem in mass as this does not appear to be a random problem but fairly wide spread. I have been a Mac user for years and love their products and am so confused why they do not fix this issue. ... Over the past few months the symptoms are getting worse and I think it is a matter of time until my entire machine stops working. Why is Apple not helping with this!!??
    2GHz Intel Core Duo, Mac OS X (10.5.6), 2GB RAM
  • ponysoldier Calculating status...
    this is my second posting on this problem I have had this problem since around the time my warranty ran out I have 20 " Intel iMac 2 ghz bought early 2006 back then I had the odd freeze and black screen but at the time thought maybe too many windows open at the same time so I just restarted and got on with it
    anyhow its been getting worse over time with all sorts of weird colors and freezes ie if I put mail to the dock it will freeze and on screen is left a twisted image half closed appears and it freezes also have random lines running through the screen it is less since I installed SMC fan control but still happens I also did clean reinstall of Tiger ( I am not going yet to Leopard ) the clock stops yet if my macbook is downloading in another room it keeps on going ok and ISDN modem was on my intel mac which is the one that freezes all the time so I am sure its a screen issue Apple say bring it in but it will cost you for us to look at it and its most likely a logic board needing replaced this is the stock answer what I get is the same as the photos posted here on this discussion board sometime it just whiteouts (scary to se happen ) other times it goes black other time you get every color of the rainbow like a tv tester screen that then fades and most days white lines running across any open window
    at one stage Photo Booth and Skype looked like it can't get the camera the image just sort of appeared for a second then faded to black screen and the green light on camera went out
    that was really scary as I though now its really dead
    the first time I tried doing a hardware test the dust that came out was a **** of a lot and this was the first time I had ever heard a fan working yet they test ok in fact everything tests ok
    I am baffled by this as I have had macs since day 1 and NEVER had trouble and am also very careful

    I now see in US there is a class action against Apple for horizontal lines
    http://www.appleinsider.com/articles/09/01/05/applesued_over_defective_imacdisplays.html
    maybe we need the same here..... does apple even read the discussion boards?
    They must know that this is a problem not caused by the owner of the i Mac
    Intel iMac 20', Mac OS X (10.4.11)
  • hank28 Calculating status...
    Just adding my 2007 white imac 24" to the list. Same issues - horizontal lines, freezing video, video not repainting (very disturbing when you click to close a window and it's still there - but really it actually closed!). I've found that moving my mouse down to the dock and rolling it around refreshes the entire screen. All this started happening a few months ago, getting progressively worse. Went through the same stuff you guys did, re-installed leopard a couple of times, ran diagnostics which found nothing.

    Thanks to the original poster for starting the thread (over a year ago!) and for the recommendations on the smcfancontrol app - I'm going to try it later. I'm still under the extended applecare, so I'm going to lug it in and hopefully replacing the logic board will fix the issue (if that is indeed the issue and it's not the driver). I've also got a weird slanted swath of what looks like dead pixels that's been steadily getting longer and longer for about a year now - yeah, this thing's all messed up. I had the 20" inch imac originally but returned it because the screen was way darker on one side than the other. I guess QA just isn't what it used to be.
    imac intel, Mac OS X (10.5.6)
  • Phil Gribbon Calculating status...
    Thanks to everyone on the board for the tips about SMCFanControl. It has kept my machine alive for 6 months more than it might otherwise have been.

    As expected however, we're just treating the symptoms not the problem. I've had to gradually increase the speed of the fans over time, but the horizontal lines and lockups keep on creeping back.

    The problem is so bad now that lines are appearing on the login screen from a cold boot, and the fans have to be on full for anything as graphically intensive as navigating the Finder window.

    There's not much point complaining to Apple - I didn't buy the right to complain (aka Apple Care) during my first year. Still, throwing away an iMac that's less than two years old seems very wrong.
    24" iMac 2.1Ghz, Mac OS X (10.5.6)
  • kdawg22 Calculating status...
    Add another to the list... except I'm twice affected! I have two 20" Intel iMac's - a core duo and a core duo 2 that BOTH have the video problem with horizontal lines. They both do not have applecare, as I only got it for my macbook because I couldn't afford both.

    One has 256mb x1600 ATI video (the core duo 2), and I'm not sure about the one - have to check. I'm convinced it is heat related as well and probably the VRAM, smcFanControl brings some bandaid relief but not enough that I can keep using them.

    Screen shots are same as TheNewFlesh's first post.

    So I have two non-sellable computers that Apple wants $800 each to repair! What can I do??? I already had to shell out money to buy a replacement iMac because I work on it everyday and couldn't have any downtime. It seems there should be enough cases to warrant Apple to address this hardware flaw.

    -kdawg
    20" Intel iMac Core Duo 2 / Core Duo, Mac OS X (10.5.6)
  • Csoup Calculating status...
    I believe I may have a fix. I have read several posts on this, and one thing I noticed is that the problem seems to exist with several types of video cards. My imac has the nvidia 7300 and I was getting the video glitch problem when the unit would warm up. SMC fan control seemed to help solve the problem. But, I know that smc is just a band aid. I went ahead and opened up the imac and started to search for the problem. There are three fans in the iMac, I cleaned all three. The trick is under the mainbord there is a heat sink. The heat sink collects quite a bit of junk. I loosened the main board so I could get out all the dust and to my surprise there was more dust than I suspected. You have to manually take the imac apart to get to this heat sink, I have cleaned my imac many times with compressed air (when its assembled) and it will not clean this heat sink. The heat sink im talking about is the video card heat sink. After reassembly I cant get it to glitch.
    iMac, Mac OS X (10.5.6)
  • Craig Fletcher Level 1 Level 1 (5 points)
    Currently Being Moderated
    Feb 9, 2009 7:41 PM (in response to Csoup)
    I also did this but I could not get things apart enough to get to this heat sink. I guess I may be looking in the wrong place. I have to admit blowing things out helped for about a week or two then it just started acting up again. It was only a very temporary fix and I assume I may not be able to get all th e dust out but I cannot get it apart enough to look without breaking something. I am so frustrated that Apple is not helping with this as I have been a very long time Mac fan and am so dissapointed about them ignoring this VERRY OBVIOUS PROBLEM!!! Apple Get your Act together and take care of the customer!!!
    2006 iMac 2.0ghz core duo, Mac OS X (10.5.6), 2 gigs of RAM
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