External display noise horizontal flicker line on m1 macbook

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Level 1

9 points

External display noise horizontal flicker line on m1 macbook

Hi there. I bought a Samsung LF22T450F Full HD screen to extend my mac at home, but there's a huge problem when connecting. The screen has a flickering grey line (or noise) on low contrast detail (grey color, light white color,..). It looks pretty annoying. An of course I also suffering fuzzy text that Apple's solution doesn't help me. I searched for many questions here but no answer.

Please help me if you know this problem,

Thanks!

P/S: the screen works perfectly normally on a Windows laptop. In my mac, I'm using Type-C to DP adapter and HDMI to DP but both are the same result

Posted on Jun 5, 2021 9:20 PM

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Answer 1

jmarse1

Community Specialist

Jun 6, 2021 3:48 PM in response to ngocanhnckh

Hi, ngocanhnckh, and thanks for reaching out. We understand that you're having an issue getting your external display to show content properly. We'll be glad to help you out.

There are several things you'd need to test to narrow this down. To begin, we'd recommend trying this with another cable and adapter if needed. We understand that it works with other systems, but there still could be a compatibility issue with your Mac and this display.

We also recommend to take a look at these steps to Get help with video issues on external displays connected to your Mac.

We hope this helps out.

Cheers!

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Answer 2

ngocanhnckh Author

Level 1

9 points

Jun 6, 2021 9:27 PM in response to jmarse1

Hi jmarse1,

Thanks for replying to my question. As I mentioned, I've tried many different cables: HDMI, Display Port but they are the same. When I set the contrast to very high, the problem becomes less serious but still happens and it hurt my eyes too 😥. I also tried "https://support.apple.com/HT201177" before posting this problem

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Answer 3

rose_10

Community Specialist

Jun 7, 2021 4:17 PM in response to ngocanhnckh

Hi, ngocanhcnckh, In that case, it may be best for you to reach out here directly and speak to the support advisors here about your issue: Apple Support

Thanks for reaching out for help.

Take care!

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External display noise horizontal flicker line on m1 macbook

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