I wonder if it's something with the trackpad/keyboard cable. Or the microphone assembly. According to the schematic, the microphone houses the other hall effect sensor. It actually looks like the way this circuit works is that both hall sensors feed into a logic gate, which then transmits the signal to the SMC to indicate the lid is open. Or closed. But the information from the mic is likely coming through the IPD cable (the one that is for keyboard and trackpad) since the mic connector is on the same PCB as the keyboard circuitry.
I have no idea what the logic table for this gate looks like. So if it's only getting the open signal from 1 of the 2 sensors, it may not send through the "I'm open" signal. Long story short, make sure that cable is seated properly to all connections, but particularly the ones to the logic board itself, and the one underneath the logic board, which connects it to the keyboard. As well as making sure the mic is undamaged, and the cable is seated properly.
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[image|2674473]
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EDIT: On further examination. this logic gate likely transmits lid sensor data through to the trackpad/keyboard so they can be available for use when the lid is open. I also had a look at the data sheet for the logic gate itself, which indicates that it is set to allow voltage through in the case that both inputs are present. OR in the case that the A input is present, but not B. But not the other way around. So if B is present, but not A. The gate does not open. I am not certain in this case which is A and which is B. And ultimately the SMC recieves this data as well. So it may have similar programming. I would still check these cables regardless.
I wonder if it's something with the trackpad/keyboard cable. Or the microphone assembly. According to the schematic, the microphone houses the other hall effect sensor. It actually looks like the way this circuit works is that both hall sensors feed into a logic gate, which then transmits the signal to the SMC to indicate the lid is open. Or closed. But the information from the mic is likely coming through the IPD cable (the one that is for keyboard and trackpad) since the mic connector is on the same PCB as the keyboard circuitry.
I have no idea what the logic table for this gate looks like. So if it's only getting the open signal from 1 of the 2 sensors, it may not send through the "I'm open" signal. Long story short, make sure that cable is seated properly to all connections, but particularly the ones to the logic board itself, and the one underneath the logic board, which connects it to the keyboard. As well as making sure the mic is undamaged, and the cable is seated properly.
[image|2674473]