LG Monitor and MacBook Pro not connecting

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LG Monitor and MacBook Pro not connecting

I recently updated my MacBook Pro M1 Pro to the newest OS and upon doing so my LG monitor stopped connecting to my laptop. I connect it through the USB C to HDMI adapter. I have tried plugging in the HDMI cable from the LG to my MacBooks HDMI port and it still hasn't worked. I have tried unplugging the LG computer as well and doing the process all over again and I have also been on with apple support twice now and have not been able to figure out the issue. I used my dad's MacBook Pro that has not been updated and it worked with the monitor so I know the issue has to be the new update. I was going to try to update my LG monitor but discovered you are not able to update it. Does anyone have any advice they can share. Id rather not buy a new monitor. Im just annoyed because everything was fine until this new update.

MacBook Pro 14″, macOS 15.4

Posted on Apr 29, 2025 02:17 PM

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Answer 1

Apr 30, 2025 08:51 AM in response to jacob2734

that appears to be a 4K display with HDR (10 bits/color)

HDMI 2.0

Yes x 2

DisplayPort 1.2

Yes x 1

In more recent versions of MacOS, the display software more closely monitors for transmit errors. if any occur at the current settings, the display is blanked.

Your Apple-silicon M1 MacBook Pro appears to be able to produce a HDMI 2.0 signal directly from its HDMI port. That is good for up to 4K at 60 Hz* (*10 bits color requires a compromise on colors available) with a single cable, PROVIDED the cable is at least a PREMIUM spec cable or higher ULTRA spec (backward-compatible) cable.

Full support of 10 bits/color at 4K resolution at higher refresh rates can be accomplished using TWO cables, one for each (Left-Right) half of the display, and putting them back together in the display using Picture-By-Picture feature. Data rates on each of the two cables are then quite modest.

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