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My MacBook Pro (A1989) should have two hall sensors on most extreme position of motherboard. I found out, that my MacBook has only one. The other sensor pins has just connected two connection positions (middle two facing towards display). From time to time, it happens, that when I close the lid, Mac falls to hibernation, but does not wake up, when I close the lid. I am puzzled. I was wondering, where to get second sensor, or how to make this more stable. I guess current state with shorted pins is but unusual. Can you help?

Are you sure you selected the correct model here? This systems board number is 820-00850 Double Check. Take a picture of your boards hall sensor/s and where the missing one would be Adding images to an existing question

Update (06/21/2021) @Ivo Hanuška - Your board number doesn’t make sense! As you can see for these systems all are 820-xxxxx (five digits) Apple loves hiding it and the very newest one have a new code system a QR tag and a four alphanumeric code.