BooRadley908
2 Bronze

U2720Q, USB Type-C, MacBook Pro, flickers on/off

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I've noticed a fairly consistent and worsening flickering with my new Dell U2720Q where the display goes dark and then reconnects.

At first I thought it might have been a loose cable but I've ensured that the USB Type-C cable is tight at both the monitor and laptop end.

Any advice on troubleshooting or isolating the problem?

Details of my set-up:


Dell:
Settings:
- USB Type-C Prioritization: High Resolution
- Response Time: Fast
- Smart HDR: Desktop
- Aspect Ratio: 16:9 wide

Display Info:
- USB Type-C connection
- DP Capability: DP 1.4 (HBR 2)
- HDMI: 2.0
- USB: 2.0 

MacBook Pro:

Screen Shot 2020-09-22 at 4.45.41 PM.pngScreen Shot 2020-09-22 at 4.45.50 PM.png

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1 Solution

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BooRadley908
2 Bronze

Re: U2720Q, USB Type-C, MacBook Pro, flickers on/off

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Heads up @gstebbins  that I got a new Nimaso USB C to USB C (Gen 2, 3.1, 100W, PD) cable and so far so good on the problem not recurring. I'll let you know if that continues.

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14 Replies
DELL-Cares
Moderator
Moderator

Re: U2720Q, USB Type-C, MacBook Pro, flickers on/off

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Thank you! We have received the required details. We will work towards a resolution. You may also receive assistance or suggestions from the community members as well.


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To help us troubleshoot, click our Dell-Cares name and send us a private message with your Dell PC or Monitor Service Tag number

BooRadley908
2 Bronze

Re: U2720Q, USB Type-C, MacBook Pro, flickers on/off

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Dell mentioned that they wouldn't be able to help me so this issue is still outstanding in case anyone in the community has anything to offer here.

I'm leaning towards some kind of data speed or power problem.

Latest evidence for that is that the lights on my keyboard which is connected to the monitor also flicker at times when the monitor's display does.

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aronimahi
2 Bronze

Re: U2720Q, USB Type-C, MacBook Pro, flickers on/off

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@BooRadley908 
I think there are two USB-C Ports behind the monitor. One with charging, the other one without. Try both.

2. In the monitor on screen menu, you have two connection modes. Try both

Curious to hear back

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BooRadley908
2 Bronze

Re: U2720Q, USB Type-C, MacBook Pro, flickers on/off

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Only one of the ports delivers enough power to power the laptop. That's the one I'm using.

In the OSD, only one of the modes—"High Resolution"—can deliver this resolution with 60 Hz refresh rate. That's the one I'm using.

I'm leaning towards a problem with the cable or the port on the display or my Mac as it seems to happen when I move the monitor around on its arm.

S1Seven
2 Bronze

Re: U2720Q, USB Type-C, MacBook Pro, flickers on/off

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Hi I am facing the same problem. Tried already different USB-C cables but were not able to solve the problem.

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gstebbins
2 Bronze

Re: U2720Q, USB Type-C, MacBook Pro, flickers on/off

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I'm experiencing the exact same issue with my U2720Q. Sometimes the flicker is more frequent, sometimes less frequent. It's never off for more than .5 of a second.

I'm connecting via USB-C to the top left port (if looking down onto the MacBook)

Specs:

https://share.metricinsights.com/YEuyrvR5

https://share.metricinsights.com/GGurl0QR

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BooRadley908
2 Bronze

Re: U2720Q, USB Type-C, MacBook Pro, flickers on/off

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Heads up @gstebbins  that I got a new Nimaso USB C to USB C (Gen 2, 3.1, 100W, PD) cable and so far so good on the problem not recurring. I'll let you know if that continues.

View solution in original post

gstebbins
2 Bronze

Re: U2720Q, USB Type-C, MacBook Pro, flickers on/off

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Got it, thanks @BooRadley908 ... appreciate the help! Just ordered the same one 🙂

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BooRadley908
2 Bronze

Re: U2720Q, USB Type-C, MacBook Pro, flickers on/off

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Hmm, this worked for a while but today the video signal and power dropped completely from the USB-C port.

I've read through this and am not having any luck troubleshooting with any of those steps.

Using a Dell UltraSharp USB-C Monitor with a Mac

Did I just get a dud Dell?

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