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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.

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).

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...

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.

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...

After a break I'm back to this machine and determined to make it work. I got the DFU Restore to go through successfully and install a new OS. After replacing the trackpad and cable one more time, I am back to where I started: cursor tracks but no keyboard and no haptic. Also, the LAS and Touch...

I just did a DFU Revive (with connected battery) and the machine is now up and running, starts up normally, and passed all diagnostics.

Same behavior with PMU_ONOFF: I got it to start up once again (fully functional), and then nothing on the next 20 attempts. Could this be a firmware issue?

The USB meter says 0.09A. Curious observation: I connected a power button to the logic board and I got the machine to start up by long-pressing the power button several times. This worked once, then nothing again. I had the battery connected for this. The entire system appeared functional when...

Chip position is the same as on the donor board. I also transplanted U2890, the TBT ROM from the donor board. When I connect a charged battery, all 4 ports show 20.6V but 0.00A.

Correction: PP3V3_G3H_RTC_X measures 60 Ω (0.05 diode mode) right after unplugging USB power but over several minutes increases to the expected 500+ kΩ (0.40 diode mode).

I have this A2141 that came in with no power. I found a dead left USB port (heavily corroded plug receptacle). With a good USB board, the plug still did not work (USB meter turned on & off repeatedly), so I suspected damage to the CD3217. I replaced both CD3217s on that side (U3100 and U3200)...

I wish you had stopped me from running a DFU Restore! Apparently, DFU always fails when the trackpad is not fully functional (error -1). Got a bricked machine now.

All SCL/SDA lines are properly pulled up. I made sure that PPBUS_AON (12V) is present on the trackpad itself. I also tried a replacement daughter board and keyboard. No change. Software enable for haptic is on. I’m going to run a DFU Restore just to make sure that there’s no underlying firmware...

A first pass inspection of page 94 (Trackpad Support) revealed no abnormalities. I'm comparing to an A3113 board since the trackpad circuitry is identical. Specifically, what would explain the presence of tracking but lack of haptic feedback and keyboard function? A faulty INT line? A bad CLK...

I have tried four different A3114 and A2941 trackpads and the results is the same for all: The cursor tracks movement and I can select but there is no haptic feedback and the keyboard is dead. I believe the issue is logic board related.

This A3114 had significant liquid damage to the upper right corner of the logic board, affecting the entire trackpad circuitry. Machine appeared functional except no trackpad and no keyboard functionality. I cleaned corrosion and replaced around 15 affected components from a A2941 donor board...

Ah, so fully functional NANDs are required for VCORE to appear. I might try to transplant some NANDs from a similar model.

Thanks. I looked at all big coils (and little one as well) and everything looks good. I get ALL_SYS_PWRGD = 1.8V but no VCore.

Customer says that the screen went out, then it stopped chiming. I tested the screen and it was missing its backlight (I replaced the 49B1-04 backlight chip on the T-con board and the screen works now). I only have data on the big coils from a similar model (A2159, 820-01598), do you have exact...