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Did it… same

Tried.. Same thing.

Yep, same in safe mode

Drives don't disappear on EFI even leaving it connected.

I’ll leave it connected on EFI tomorrow. Problem after os is loaded happens with ISB 2, 3 and hdmi

Just replaced it, same thing! Also replaced U2890, which is the BIOS chip for TBT

What chip is that? Yes, I get power on USB, but no communication nor HDMI signal.

Hello. This board came to me with no life. Shorted 3V3 line. Corrected that problem and the board started. Everything works fine except for USB/Thunderbolt/HDMI. I have a Satechi USB-C hub here which I use on all my personal Macs and use it to test all costumer's Mac, So I know it's working...

Yes, I agree it's not a driver issue because I formatted and installed new fresh OS and problem persists. But, what I meant is that it's only after all drivers load that the problem starts, telling me it's an issue when it requires more from the graphics side... I'll try to get a test display...

It goes black with just backlight on, no image. I’ll test that signal tomorrow. I don’t believe it’s a screen problem because the problem only occurs after system completely boots and if video drivers are loaded.

Hello. Got this one here with a strange problem. Internal video is lost a few seconds after the system loads. Just internal video is gone, backlight keeps on. On external monitor it works ok. If I start in safe mode everything works, except of course graphics drivers are not loaded, but internal...

Sorry, don't have thermal camera here. But the only thing that gets a little warmer than the rest of the board is the webcam controller region, which is fed by 1.2V and not PP5V. And that's after around 5 to 10 minutes connected to charger.

I already did that. Compared to a donor board, component by component, all traces and resistors are fine.

R7545 is fine. Replaced C7524 just in case, same thing. PP5V_S5 is stable @5V. I tried lifting every cap related to 5V output that point to GND, but same 3V on PP5V_S4RS3 output but same. Certainly something has leaking voltage on 5V line, but cannot find what it is.

My bad. I read PDDR3_S0 instead of PDDR_S3. Will check all those components.

Here's a video showing what's happening:

I also thought it was not possible to get any S0 voltages without stable 5V on L7520, but that's exactly what's happening. I have 3.05V there and still get stable 1.2V on L7430. Diode mode reading on L7520 is 0.398. R7520/21/23 reading fine and traces ok. Pin 4 of U7501 stable 3.3V

Hello. Got this board here with a strange issue. It partially turns on(some S0 state voltages are present). No fan spin. I have DDR voltage stable ate 1.2V, but PP5V_S4 is measuring low, at only 3.05V. Tried replacing TPS51980 and MOSFET, still same. Something is dragging 5V voltage down, some...

Q7180(which I already replaced before) was bad and preventing PPBUS to get high. Replaced it and now everything is working again. Thanks!

I confess I didn't check PPBUS_G3H before as machine was turning on. But after you asked I tried turning board on outside the case and it didn't, so I checked PPBUS and it's giving only 1.156V. I have no shorts there, so I replaced U7100 and Q7130, but still same weird voltage on PPBUS.