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  • Cosman Level 1 (10 points)

    Ever since I got a new MBP with the new thunderbolt port, any monitor I hook up to the port will turn on and off repeatedly for several minutes before becoming stable.  The monitor may turn off later, but usually stays stable after it has been connected a while.


    The monitor will drop out, showing the "no signal" text, then even going down to sleep mode (green light turns to yellow).


    I took the MBP into the genuis bar and they diagnosed a bad mother board.  After it was replaced, the problem stayed the same, so it is not the mother board.


    I thought it might be the thunderbolt adapter, but I have two of them and the problem occurs on three different monitors with either ofthe adapters.  None of the monitors is a Thunderbolt monitor.  I use the VGA port.


    The MBP screen is not affected.

  • d-mon-k Level 1 (5 points)

    If no one of displays is Thunderbolt, why you write here instead of create a new discussion? This topic about 27" Thunderbolt Display flickering attached by thunderbolt, not using VGA adapter.


    Also you didn't provide info about your MBP model (13"/15", original / retina, memory size etc.)

  • Cosman Level 1 (10 points)

    Well, I posted elsewhere and got referred here.  Sounds like the same problem, though.  Also, the poster before me stated he had the same problem on non Thunderbolt displays.


    My particulars are


    Hardware Overview:


      Model Name:    MacBook Pro

      Model Identifier:    MacBookPro8,2

      Processor Name:    Intel Core i7

      Processor Speed:    2.5 GHz

      Number of Processors:    1

      Total Number of Cores:    4

      L2 Cache (per Core):    256 KB

      L3 Cache:    8 MB

      Memory:    8 GB

      Boot ROM Version:    MBP81.0047.B27

      SMC Version (system):    1.69f3

      Serial Number (system):    ----------------

      Hardware UUID:    3C4B2FB2-7E56-5E33-8D94-7469266C6C83

      Sudden Motion Sensor:

      State:    Enabled


    <Edited by host>

  • docgoku Level 1 (5 points)

    Same issue.

    I'm on a 5 hour old MB Pro 15 Retina and TBD.... fun.

    Model Name:          MacBook Pro

      Model Identifier:          MacBookPro10,1

      Processor Name:          Intel Core i7

      Processor Speed:          2.7 GHz

      Number of Processors:          1

      Total Number of Cores:          4

      L2 Cache (per Core):          256 KB

      L3 Cache:          8 MB

      Memory:          16 GB

      Boot ROM Version:          MBP101.00EE.B02

      SMC Version (system):          2.3f32


    Thunderbolt Display:

      Display Type:          LCD

      Resolution:          2560 x 1440

      Pixel Depth:          32-Bit Color (ARGB8888)

      Display Serial Number:          ----------------

      Main Display:          Yes

      Mirror:          Off

      Online:          Yes

      Rotation:          Supported

      Connection Type:          DisplayPort


    <Edited by host>

  • William_o Level 1 (0 points)

    Flicker here. Macbook Pro 13" mid-2012, i7. Installed 16gb ram from OWC + 256gb Samsung SSD + Data Doubler. Attached two TB 27" displays and started noticing flickering. Seems to be more common when viewing Youtube. Played several MP4 movies and didn't have severity. Tomorrow I'm going to swap memory down to original 8gb.

  • orchetect Level 1 (10 points)



    This may be slightly beside the point, but I'm very curious to know if BOTH your TB displays flicker at the SAME TIME or only one at any given time?

  • William_o Level 1 (0 points)

    definitly NOT synchronous. They will flicker independently of each other, with *perhaps* greater frequency on the display running full screen youtube video.


    The screen flickers occur once about every 2-5 minutes, sometimes less frequent. It definitely happens, though, and for a display of this price, should funciton without this issue.


    I unplugged all USB devices and that didn't prevent it. I changed the desktop image to basic color and that didn't mitigate it either. If the memory doesn't take care of it, the displays are getting returned.


    I'm planning on running a memory test overnight on the 16gb, just to check.

  • orchetect Level 1 (10 points)



    OK, good to know.  BTW, I spent months diagnosing this problem and categorically it is the RAM being over 8GB that causes flickering.  Reverting back to 8GB or less will resolve it.

  • William_o Level 1 (0 points)

    I deferred to your better judgement and decided to swap the OWC 16gb RAM with my original 8gb. So far, running it for about 20 minutes, with numerous videos playing and regular activities, it appears the flicker is gone. So, at least in my case, that appears to have solved the problem.


    Thanks for the help!

  • docgoku Level 1 (5 points)

    Wow... I wonder if it's something about the power draw of that extra 8GB of RAM that messes with the TB signal.


    I've gotten worse here on day 3 of the new MBP Retina Mid 2012 w/ 16GB and the TBD.


    Today, at one point it shut off...I would remove and plug back would stay dark.

    Then I'd let it sit for 30seconds...try again... TBD would come one then drop.

    Also late yesterday into today I'm starting to get the flicker.  Now it's about every 20-30 seconds and eventually just goes all black.  I'm not even using the display for the past few hours it was happening so much.  I also disconencted the ethernet cable b/c I got tired of reconnecting my VPN/other connections over and over....


    I guess I'm going to take it back b/c I run a bunch of local virtual machines and the 16GB of ram is what I need.


    I just don't see how they will be able to patch this one... new firmware on the MB Pros that have 16GB of ram maybe...? 


    I'm assumign the normal cinema display will work better.  I'll just not have the 1GB ethernet, and hub features...


  • clintonfrombirmingham Level 7 (30,000 points)

    Sounds as if you just got a lemon - I've no trouble with my non-Retina MBP and 16GB of RAM.


    I would take your whole kit into your local Apple Store or AASP and have them diagnose the problem. The TB Display should just work with your Retina MBP - no matter the amount of RAM.



  • docgoku Level 1 (5 points)

    Trend is the non-retina MBP and the 8GB MBP retinas run just fine with the TBD that appear to be lemons to people with MPB Retina 16GB. 


    I would have taken it back already if the apple store wasn't 1.5hrs from me and it wasn't 12/23-24-25... yesterday I would've spent over an hour in mall traffic.    Not fun.


    I was there on the 23rd picking up a HHD recall on my 27" iMac, it had one of those segate drives that "will" die at some point.  Took three days to swap a HHD.    Had over an hour of mall traffic congestion.  Still better than waiting on a shipment/RMA.


    I'll be back after christmas and will try another TDB but from what I'm reading... some people were on their 2nd or 3rd with the retina 16GB rigs...and still having issues.  I'm just debating wether to avoid the Thunderbolt display and go with the Cinema 27"...but that just irks the **** out of me b/c they cost the same and the TBD is made to work with this laptop almost exclusively. 


    I then compare the $999 to a $525(normally $699) Dell 29" panoramic ultrasharp.  I do security work with tons of logs and the color acuracy isnt' as important as the real-estate/simplisity.  We were trying to go from 2x20" to one single 27" with massive resolution.  At this point I'm goign to have 2-3 days of debug in on this guy.


    That's what I get for not searching the forums first... but who searches for issues on a monitor.... it's a bloody monitior.


    I'll report back after Christmas how monitor #2 goes. 

  • JaboneDFW Level 1 (0 points)

    I've had my MBPro 13 inch for a while now and my 27 TBD for about 7 months (I think).  It has been stable, then a few months back the TBD would shut off and not come back - no matter cycling display power, remove TB connector etc.


    This became increasingly worse and performed a reset at boot up (per TBD manual) of Command, Option, P, R at startup.  Now my display flickers constantly and is pretty useless.


    What it *appears* to happen is the display believes the MB had its lid opened as the one USB drive I have connected to the display continues to spin and is accessible.

  • docgoku Level 1 (5 points)

    when it flickers and cuts off.

    Feel the thunderbolt cable that is connected to your MB Pro.

    Particularly the plastic end with the "lightning" icon.  Is it crazy hot?

  • JaboneDFW Level 1 (0 points)

    Actually, the TB connector does get quite hot which is odd considering the display is "off".

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