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23.7-inch LG UltraFine 4K Display wont display instantly with Macbook pro or iPadPro. Please help!

23.7-inch LG UltraFine 4K Display won't display instantly when connected to Macbook pro (2017 running Monterey 12.1) via thunderbolt. If I switch the monitor off at the power point then plug it into the computer it works. But it is highly inconvenient crawling under the desk every time I need to use the monitor. Also, I can't get the iPadPro to connect at all (tried thuderbolt and USB C).


Very disappointed as I spent the extra cash to buy a product endorsed by Apple to avoid incompatibility issues.

MacBook Pro 15″, macOS 12.1

Posted on Dec 27, 2021 1:04 PM

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Question marked as Top-ranking reply

Posted on Dec 27, 2021 2:33 PM

to get a Mac display to become active, you need the Mac to query the display, and the display to answer with its name and capabilities. Otherwise, the display will not be shown as present, and no data will be sent to the display. "No signal detected" is generated by the DISPLAY, not by the Mac.

 

This query is only sent at certain times:

• at startup

• at wake from sleep — so momentarily sleeping and waking your Mac may work

• at insertion of the Mac-end of the display-cable, provided everything on that cable is ready-to-go

• on invoking Option-(Detect Display) button in Displays preferences (from another display)

 

so try doing some of those things and see if the display comes alive.

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5 replies
Question marked as Top-ranking reply

Dec 27, 2021 2:33 PM in response to LeaPea123

to get a Mac display to become active, you need the Mac to query the display, and the display to answer with its name and capabilities. Otherwise, the display will not be shown as present, and no data will be sent to the display. "No signal detected" is generated by the DISPLAY, not by the Mac.

 

This query is only sent at certain times:

• at startup

• at wake from sleep — so momentarily sleeping and waking your Mac may work

• at insertion of the Mac-end of the display-cable, provided everything on that cable is ready-to-go

• on invoking Option-(Detect Display) button in Displays preferences (from another display)

 

so try doing some of those things and see if the display comes alive.

23.7-inch LG UltraFine 4K Display wont display instantly with Macbook pro or iPadPro. Please help!

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