jayant180 Author

Level 1

8 points

External display on imac - changing resolution

Hi - I have a 27" 5K 2019 iMac to which I have now connected a Samsung monitor - S24E450B 24-Inch Monitor (16:9) - as an external display. The optimal resolution for this monitor is 1920 x 1080, but I am unable to get the monitor to change to this setting. When I use the iMac's System Preferences -> Displays for the external display, it only shows 2 elections under the "Scaled" bullet - (i) 1080 x 1920; and (ii) 900 x 1600.

Any suggestions on how I can get the Samsung display to its optimal resolution of 1920 x 1080?

iMac 27″, macOS 10.15

Posted on Jun 20, 2020 8:15 AM

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5 replies

Level 10

90,874 points

Jun 20, 2020 8:18 AM in response to jayant180

Hold the ALT (option) key and click on the Scaled button.

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Level 10

250,253 points

Jun 20, 2020 8:34 AM in response to jayant180

Your screen is Rotated 90° to Portrait mode, 1080*1920 is 1920*1080 but rotated.

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jayant180 Author

Level 1

8 points

Jun 20, 2020 8:23 AM in response to den.thed

Thanks - I see more resolution options after doing that, but still no 1920 x 1080 option.

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jayant180 Author

Level 1

8 points

Jun 20, 2020 8:36 AM in response to BDAqua

Thanks - that was pretty obvious in the end...... Appreciate the help.

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Level 10

250,253 points

Jun 20, 2020 8:39 AM in response to jayant180

Great news I could help, I find sometimes I don't see the answer myself until I ask about it, take care my friend. :)

Would've taken a lot longer without the pic though. :)

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External display on imac - changing resolution

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