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Thanks to Discord chat, piernov and ChrisB, we found a solution for this problem.
Q1920 is a Strap to temporarily disable ME region. I had 2 boards, 820-3437 and 820-00165, both with the same "boots till 100% than freezes" and "iGPU kext timeout" in Verbose mode.
3437 had some water damage on...
this is TPS62180 and it would be absolutely wrong and disrespectful to translate "apple notebook schematics" in Russian: "????? ????????? Apple" and god forbid someone looks in google for it.
Can someone give me a "normal" partnumber for this chip? As far as i see it has full short circuit to ground and i hope it did not pass 10.8v directly to the SSD.
once again - macbook 15 2018 is a piece of shit which sucks water right into the SSD power IC, killing the SSD with zero data...
OK, solved. that was a keyboard damage and since i happend with two devices i decided to repair it instead of replacing the keyboard.
on keyborard jack , pin 8 from left, jumper to the testpad 2cm higher(just near the partnummer stuff), first row 3 from right is a SMC OnOff.
quick diagnose -...
why dont you use cracked lcd as a test screen? this glitch looks fat enough to be visible on the old screen as well.
whould be rather funny to know thats a firmware issue
i have 2 devices with the same problem. had one last month, customer needed to backup his data - so he took the device as soon as he saw apple logo (in urgent cases i allow customer to see the process)
power button does not work, kind of shorted but not. call me dumb, i do not get it.
SMC_ONOFF...
I wonder why it fails so funny, i mean it does not really pull down the smbus, it just posts some trash so line wont be recognized by smc anymore. I mean i do not see any difference on oscilloscope, but it definetely fucks up the whole line. Afaik it fails pretty often in the exact same way...
so if someone looks for a sollution without replacing crappy flexgate display.
remove R8556 R8558 to cut failed sensor from the SMC communication line.
camera works, no idea if something else will not work(i guess some crappy light sensor should be definetely dead, who cares), would not...
with display connected i got 128C on all sensors except CPU/Gpu internal and "incoming air" . Also, Camera can be disconected separately (small cable left to the USB C side), makes no difference.
also i have 1/2 Sec pulses on Airport Temp sensor (the only one i can measure in chassey)
without...
unfortunately i have no display assembly to test. if it was older board it could be SMC SDL SCL shorted to ground but this board has only one chip on this line for CPU Thermal sense + Camera. I hope its not The Camera because than it will really suck.
I will check with HWMonitor, device boots...
You should put your probe on the cpu side of the inductor. The reason you're reading 0.1...3.8v is that you're reading output of the buck converter which is basically a sqare wave with a pulse width proportional to voltage.
As for random start behaviour, you need an oscilloscope to check all...
Everyone knows that IR Camera is a 800$ useless shit which works almost like isopropanol but gives you a luxury feeling of being a short-circuit predator.
Long story short, IR cameras look like shit not only because of a shit sensor, but because they are always unfocused. exactly like Barlow...
small update. since disk utility did not show any drives including external USB or recovery loop device, i tried to check if it is recognized in terminal(next hope was to use it with external SSD drive) i can see partitions, it even tries to format them but it keeps saying that i do not have...
well, the nasty chip is some sort of power ic with 3 outputs which look perfectly fine. found some feedback lines, they are ok. my only hope is that there's something like fuse resistors near the chip.
as you can see on first photo, there's nasty capacitor near the coil. because apple is very...