The MacBook detects your lid being closed with a magnet. Speakers also have a magnet, thats how they work.
When you put your speaker on your Mac, it "thinks" the lid was being closed and goes to sleep.
Imagine building yourself a monitor, and the only part you have is the screen display itself. No input port, controller circuitry, nor power supply.
There are not going to be easy steps that you can follow unless you can determine the OEM of the panel and dig up a kit and guide to provide a display assembly that drives that LCD panel.
Use MacBook Pro LCD ...
iOS installer are located in
and you need to find your device's folder
iOS backups are located in
or you can select iOS device via side bar, select General tab and then Manage backups
Is the screen broken? If not, you might be able to make yourself a monitor using the screen. You will need video ports and some LCD controllers. You might be able to code your own firmware for the monitor, because it might need proprietary drivers. You can practice using other screens. There is something I must advise, and that is that you will probably ...
In case it helps anyone: I was running into a similar problem with a 2017 MacBook Pro but found a different solution... download speeds on other devices (iPhones, newer MBP) were steady around 500-750 Mbps down, but on my 2017 MBP the speeds would gradually slow down until they were anywhere from like 5-10 Mbps, sometimes even <1 Mbps, all tested using ...
I believe the following happened:
Your MacBook display's native resolution is 2560x1600. However, the default setting on the 13-inch MacBooks is 1440x900@2x (making the UI slightly larger for better accessibility). What the MacBook is supposed to do:
Render screen at 2880x1800 (to create 1440x900@2x)
Scale down to 2560x1600
It seems your MacBook failed to ...
I don't think there's much you can do except for contacting Apple Support. You can test if the issue is with your display by using Target Disk Mode and booting up off of your Mac. This allows your Mac to act as a hard disk. To boot in Target Disk Mode, press T on your Mac when it is turned off. Then, you will need another Mac. Use a ThunderBolt cable to ...
Previous reboots did not recover desired behaviour. But having checked the presence or absence of symptoms during Recovery Mode as per Andreas Ley's comment in my original question (behaviour was normal), I reboot again into normal mode and correct behaviour remained.
So I don't know specifically what was at fault, but an interim Recovery Mode reboot helped ...