A3113 Air with lid angle sensor issue

[sekidata]

A3113 MacBook Air, came in with a bad screen, damage to the interposer flex cable connector, and a visibly burnt LT203 (PP3V8_AON).
After replacement of the display, interposer cable, and LT203 the machine was functional but I noticed that closing the lid did not put the machine to sleep. I replaced the lid angle sensor with a brand-new one and used Tahoe's Repair Assistant to program/calibrate it. That appeared to be successful but closing the lid still does not sleep the machine.

What am I missing?

 

[2informaticos]

Check UR300 signals.

 

[sekidata]

The relevant signal from the LAS, I believe, is ND_1V8 (input to UR300). It is 1.8V with lid open and 0V with lid closed.

 

[sekidata]

Hold on, is there one or are there two sensors for lid position? I see that this model has an AMR_1V8 line and iI think it's connected to an older-style magnetic Hall effect sensor. A2681 (2022) did away with this sensor in favor of LAS, but in this model A3113 (2024) both sensors are present. Correct?

 

[2informaticos]

It should be embedded into keyboard backlight sheet.
You can check at JT120...

 

[sekidata]

Ah, yes. Mystery solved. I had replaced the display with a A2681 screen since they are otherwise fully compatible. But it's missing the embedded magnet to trigger the open/close sensor (AMR_1V8 stays at 1.8V).

 

[sekidata]

As a workaround, I shorted the two lid position sensors together with a jumper wire. Now when the lid is closed, the input from the LAS brings both inputs to UR300 to ground.