Screen Flicker with External Monitor

Similar issue with macbook pro late 2014 with acer k272hul 1440p monitor. Randomly blinks at random time.

Apple do you even care ? we pay this much high cost and you act like you are mute.

atleast say u will fking look at it ...

You will have to employ the assistance of a skilled Apple authorized

service provider or specialist, whose interests include troubleshooting

& diagnostics to resolve this issue...

If the problem still relates to those models with quad core and dual

GPU, as some had in earlier builds, you may have to resort to a

replacement; perhaps a quality repair shop with workstations for

complex de- and re- soldering components on logic boards could

be contacted; a few I know about would want to have the entire

computer shipped to them, not just some parts that may see further

damages in transit or reassembly by hands with less quality control.

Depending on where you are located may have some bearing on the

level of support or positive results from an in-depth repair on a board.

I'm not suggesting just a remanufactured board, but a custom rebuilt

one that came with your computer. With the problem resolved.

In any event... you are better to address Feedback to Apple directly

& not hope to see a result (except perhaps a removal of your post)

since they seldom reply to Feedback, and won't to a post here.

•Apple Feedback:

https://www.apple.com/feedback/

Good luck & happy computing! 🙂

P.C.J. it is amazing, but I have a similar problem. Was using on capitan 10.11.4 a dualhead2go ME with 2 19" monitors in portrait, yesterday it wasn't flickering, now it was flickering, until ( after reading your post) I unplugged my iPhone 4 from the MacBookPro 5.1 - and flicker is gone. hä?
***????

After reading this post any many others, I finally solved my second flicker problem.

It is not exactly an answer first posting, but maybe it can be of help to someone else out there...

My set up is

- Macbook late 2008 unibody (Nvidia 9400M graphics card)

- External display Dell u2711 with 2560 x 1440 @ 60Hz resolution connected via cable 'mini displayport - displayport'

- Bootcamp with Win10

Problem was that display started flicker when waking up from (display) sleep.

Over the years it has been both good and bad, and recently it just flickered 1/10 times when using nvidia driver 301 and windows 7.

But then I upgraded to Win10 and I got the flicker every time when waking up from display sleep.

Solution was to make a custom resolution 2560 x 1440 @ 50 Hz in the nvidia control panel, and since then it has just worked with no more flicker. I hope it stays that way...

/Trying to be helpful

P.S.

My first flicker problem was because of an oxidized internal connector in the u2711 that made the right side (50% of the display area) of the screen flicker until you hit it.

How is everyone doing with this issue? I recently purchased a Dell U2715H and am having the exact same problem of the external monitor flickering. I have tried two different DP to MDP cables and a Thunderbolt cable with no luck. I have turned off "Automatic Graphics Switching" in the "Energy Saver" tab, also to no success. I am thinking of purchasing MDP to DVI - DVI to DP to see if that works. Does anyone have any updates? It's absolutely atrocious that after more than 5 years Apple has still not issued a fix for this issue.

Thanks, all, for the various perspectives, which helped me resolve this issue once and for all! In my case, the solution was to simply move the power cable for the monitor well away from the HDMI-to-Thunderbolt cable. The Dell S2340L monitors place the power port a good 4 cm away from the HDMI port, but I was tempted by the cable-gather just below the HDMI port - bad idea! After I moved the power cable away, the problem resolved immediately, and hasn't been back since. I also made sure the connector ends were clean, of course, and fully inserted.

Incidentally, interference could also explain why unplugging and replugging the cable or putting the laptop to sleep can help, since breaking the electromagnetic coupling between the cables temporarily could be enough to prevent it from reestablishing for a while in a marginal case.

Hey mate,

I personally had the same problem, and for days on end, I thought it was a software problem or bug that was making the screen flicker. It turns out that the matter was really just faulty cord connecting the mini display port on my MacBook Air (early 2014) to the display port on the external display.

The cord was a third-party one I bought on eBay, costing around $8. Once I pinpointed the problem, I got a proper cord from an authorised reseller and just like that it worked with no hassle.

I hope this is helpful to you mate and anyone else with a similar problem.