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  • brsm1990 Level 1 Level 1 (35 points)

    Has anyone heard of the LG persistent screen problems being due to a defective GPU?  This the latest BS story I've been given by the service center as the put the fourth logic board in my 2012 MBP Retina.  They said that replacing the logic board/GPU fixed the persistent images.

  • brsm1990 Level 1 Level 1 (35 points)

    I can't believe these stories of 3, 4, 5 even 7 returns.  How is this possible?  It sounds like the majority of these things are defective. 

    I am starting to wondering if a lot of the products that aren't returned are also defective but the users are just too ignorant to know what to expect.  I certainly ran into this when discussion over heating.  A lot of people were saying very high temps that obviously are not normal are just 'normal for macs'.  Obviously they are not when the temperatures are testing Intel limits at a regular basis without even a full load!

  • x0054 Level 1 Level 1 (0 points)

    You should have 2 GPUs, the integrated and the desecrate one. It would be unlikely that both of them would fail at the same time. Just switch between one and the other to demonstrate that it’s NOT the GPU.


    And you are right, there are some people who care, or NEED the computer to be color accurate for work, and want a $2k+ machine to be defect free. But the great majority of people are just  don’t care. Good enough is the cultural norm in US, unfortunately.

  • Merch Visoiu Level 1 Level 1 (0 points)

    x0054 wrote:


    there are some people who care, or NEED the computer to be color accurate for work,


    And even if we do care about colour accuracy, Apple doesn't consider the yellow tint a defect. At least that's what I was told 3 separate times and denied a replacement.

  • brsm1990 Level 1 Level 1 (35 points)

    LOL and persistent imaging is "normal".    Funny my thunderbgolt IPS display does not have persistent imaging.  My Philips IPS display that cost 1/4 of the thunderbolt does NOT have persistent imaging.

  • brsm1990 Level 1 Level 1 (35 points)

    You know I didn't even think of that.  You're right.  If it was the GPU causing the latent imaging than which one?  While running on the internal display it should be the Intel Graphics, external Nvidia. 

  • x0054 Level 1 Level 1 (0 points)

    This app ( actually let's you switch manually between the Nvidia and Intel GPU, on the fly. So you can wait until you can see IR, and then switch between Nvidia and Intel, and show them that nothing changes. That app is also handy to see which GPU you laptop is currently running on, it switches to the Nvidia more often than you would think.

  • brsm1990 Level 1 Level 1 (35 points)

    What is "IR"?  Is this somehow short for persistent imaging?

  • millerrh512 Level 1 Level 1 (0 points)

    For anyone that really needs or cares about color accuracy, they already own a calibration device. Uniform yellow tint is a non-issue since it can be calibrated out. In fact, it's been my observation that previous screens from Apple have all been way too blue! Calibrating them always makes them warmer. This Samsung display I have was yellower outside the box than previous displays, but actually was closer to my final calibration point than most other displays I've owned.


    Non-uniform tint that can't be calibrated and IR are the real problems here. I have a suspicion that most if you who are complaining of yellow screens have just not been around properly calibrated screens before and are used to the blue screens apple has been shipping for years and years that are not accurate.

  • brsm1990 Level 1 Level 1 (35 points)

    What is "IR" exactly?


    I agree if it can be calibrated out it's a non-issue.  Most people cannot recognize a calibrated vs. non-calibrated display or think the correctly calibrated display looks weird since they never work with a calibrated one.

  • MacOSX10.6 Level 1 Level 1 (0 points)

    But what would be an easy dummy's guide to calibrating the screen? Calibrating the LCD under "expert mode" is probably the most complicated thing one has ever come up with.


    Can it get even more confusing. *** does the following mean if it has a meaning at all:



    This is the first of five steps used to determine the display's native luminance response curves.


    Move the left slider until the brightness of the grey shape in the middle matches the backgrounds as much as possible. Move the right slider until the shape is neutral compared to its background. It may help to squint or sit back from the display.



    I have no idea what should happen here. The apple logo is supposed to vanish? Or the striped background? Do they mean the apple logo when they write "shape".

  • brsm1990 Level 1 Level 1 (35 points)

    I would say get a spyder.


    I had one years back, lost it in a move but it was great.  I am trying to figure out which one to buy now, if anyone has any input:

  • millerrh512 Level 1 Level 1 (0 points)

    I use an i1 Display Pro and it works great.  But I bet a Colormunki or Sypder would also work.  Basically any hardware calibrator should get you decently close. 


    I have used a calibrator for years and will never not use one.  Looking at uncalibrated screens almost makes my eyes hurt now.

  • JoshD Level 1 Level 1 (85 points)

    IR = Image Retention


    As far as calibration and the yellow tint. I've calibrated using a Spyder4Pro (see my posted profile earlier in the thread) and I can tell you that the yellow tint is far from correct. In other words, the calibrated profile shows is quite a large shift towards the pink from the yellow/green overall cast. The problem is that when the original calibration is so far out of whack it's much harder to get a clean calibration. The latest one has slgihtly green light greys for example.

  • millerrh512 Level 1 Level 1 (0 points)

    I see.  My appologies if my assumption of people just being used to "too blue" screens is incorrect.


    I actually had a similar issue with my very first rMBP where it was pink even after calibrating it (LG Screen, but no IR initially).  I think you'll even see my comments earlier in this thread where I assumed it was because of a pink backlight and showed images of the pink Apple logo.


    It's strange, but my Samsung screen also has the pink backlight/logo, but does not appear pink after calibrating.  But it is warmer than people are used to (as it should be).


    This makes me think this pink issue is actually a real issue.  Maybe two sides of the same issue.  Looks horrible uncalibrated and to fight that, the calibration software makes it look horrible in the opposite direction.