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I'm running two external displays from a MacBook Pro 16 inch in closed clamshell mode.

I notice however that the internal display is still on as well: it is pictured as a third screen in System Preferences > Displays, and when I open the lid ever so slightly, I can see it.

When I use the laptop without external displays, the display turns off as it should when closing the lid.

I've tried to reset SMC and NVRAM but to no avail.

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Reset to default
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It turned out to be a faulty angle sensor, which had to be replaced.

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