This caused the LG Monitor to go black for about 5 seconds, but then the picture came back. In my case I had plugged a 4K LG monitor into my 2019 Macbook using a USB-C cable (Which is powered) while my laptops power brick was still plugged in. I believe resetting SMC Helped resolve the issue of that error coming up for me too. If this doesn't help you might need to replace the I/O Board of your machine. If this doesn't work I would create a new user account and see if the problem persists, before jumping into a repair. Make sure that you are performing the correct SMC for your machine. Release all keys and the power button at the same time.On the MacBook/Pro’s keyboard, hold down the Shift+Control+Option keys and the Power button at the same time.Reset SMC of a MacBook or MacBook Pro’s with an internal battery: Release the power key and reconnect your battery and power adapter.
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