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It is commonly called a reed switch. By sliding a paperclip along the bezel bottom you can locate the magnet in the bezel. Placing a magnet on the top case in the correct position will "sleep" the display.
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Good Luck,
N.
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Genius. Trying to figure this out for years. Even the IT guys I was working for didn't know.
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I have a MBP with a busted screen (backlight working). It's hooked up to a studio diplay that is configured as main monitor in system preferences. The MBP display doesn't do a thing now, neither open or closed. No need to trick any sensors.
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but is it still in the system prefs? i hate saerching for windows that are located on a second screen thats switched off
Once the external display is configured as main all windows are displayed on it.
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ok .. it seems to be in the screen on the right side of the camera and the little hook thingy that keeps the cover down. attaching a magnet there sends my MacBookpro to sleep
thanks machead3
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Had this happen on an A1278; couldn’t figure out why. Magnetized USB connectors were the problem. Demagnetize them with something like this: https://amzn.to/2CEM4pJ
There are 4 strong N or S domains on the upper display border by the camera, starting about 2” from the outer edge of the display clamshell and ending about 3-4” inches in, on both right and left sides. This makes me think there’s either 1 or 2 clamshell sensors (hall or reed type) in the palm rest on either side of the trackpad.
pmset -g log:
…
Display is turned off
…
Entering Sleep state due to 'Clamshell Sleep' …
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