USB-C to HDMI display off and on, then disappears

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USB-C to HDMI display off and on, then disappears

I am using the USB-C connection on my 2019 iMac 21.5 with an HDMI cable connected to my Outlaw 976 preamp (which is connected to my 1080p TV). This results in intermittent screen flashing and eventually the iMac loses the HDMI connection entirely. For a short time I can see the display options which are to optimize the display for the Outlaw 976 or to scale at 1080p, 1080i, or 720p, and the same settings for the Retina display. I tried changing the setting from Outlaw optimized to one of the scaling options but it didn't help with keeping the connection stable.

iMac Line (2012 and Later)

Posted on Oct 22, 2021 7:55 AM

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Answer 1

Oct 22, 2021 8:17 AM in response to tnrgtr

Start your troubleshooting by ensuring the quality of the cables and connections between the devices.

Remove the preamp from the equation. Does the iMac gain a stable connection with the TV?

Has this setup ever been trouble free?

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Answer 2

tnrgtr Author

Level 1

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Oct 22, 2021 2:57 PM in response to D.I. Johnson

Thanks.

If I connect the HDMI cable to the TV instead of the Outlaw 976 it is stable - no issue.

Connected to the preamp I noticed that the iMac knows it's an Outlaw 976. I'm guessing this is part of the handshake process.

Could this be a driver issue or something like that?

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Answer 3

Oct 24, 2021 10:46 AM in response to tnrgtr

Yeah, it appears the Outlaw doesn't want to play nice with the Mac.

I suggest visiting the support site for that preamp and see what the manufacturer suggests. Maybe they have a software or firmware update available that will resolve the problem.

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USB-C to HDMI display off and on, then disappears

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