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Hey, So I've had this 2019 15" Pro in and out constantly for the past two or three months with screen issues The customer originally had a dent in the lid causing a backlight blemish, so we've replaced the screen assembly and started getting keyboard backlight issues which was caused by the ALS...

Decided to find the exact same caps from an 820-00165 board and placed them there, unfortunately I don't have the same board to compare but it didn't do any difference anyway. I decided to change U7100 again to be on the safe side, and sure enough cpucore_fccm is now at 2V, gonna guess that it...

Currently having a look at this board now and looking around the U7100 area, I've noticed two caps are missing, C7156 and C7146. Looking at the schematics it doesn't actually show anything regarding them being tagged as "NOSTUFF" where some components are. Could this actually be the issue with...

Ahh that's interesting - Apple making it even more annoying to use parts from different boards, was hoping to use a CD3215 instead but never mind. Thank you for that video!

So bit of an odd question going on in the workshop, sorry if this sort of question is not allowed We have an 820-01598 and we haven't really worked on them much, but we have noticed the USB-C port controllers are CD3217s instead of CD3215s - Are there's actually compatible so if I had a bad...

Hmm interesting, thanks for that info! I've just been reading up the no power issues with this particular board on the forum with some search results, and it seems like this is more than likely a dead CPU now. Would just like to try confirm its dead. I do remember replacing U7100 on this board...

Hi sorry for bumping, I'm just looking to see if there's any power up sequence for this board or any advise on how, when and where cpucore_fccm is created and any ways of seeing if this cpu is dead? I will be working on this board tomorrow morning and what to try get somewhere with it. Got no...

Definitely will do, verbose mode and Windows will be my new best friend for diagnostics. Thank you for assisting me through this, became such a stressful machine to work on. Time for the next board repair

Booted into verbose mode (never knew how to do it, what an amazing thing to have for diagnostics). Shows iGPU timeout, so assumed gpu issues when loading drivers, so booted into the Windows SSD and went to install the Intel graphics drivers, it immediately locked up and Windows died. Gonna say...

So this is becoming an odd one - I've installed Windows to a test SSD, it's installed and booted fine - Was able to boot into my Windows Installer USB fine, but using a MacOS USB which works on other devices doesn't seem to work neither does actually logging into a MacOS SSD - I've tried this...

I can boot into a Windows Installer USB. Is that any help at all? I've not been able to boot into a MacOS USB at all, but can boot into the original SSD just can't get past the login as it stops on the end of the progress bar. I might install Windows to a test SSD and see how that works out

I've just attempted a clean ME file I found on the forum, and it seems the device boots up to the login screen then once logging in - it hangs on the loading bar again at around 70%. When I restart the machine it then fails to go past the Apple logo again.

I haven't got medusa yet, have ordered one but delivery timescales are unknown - Currently using a clip method with an eeprom programmer. Original BIOS I'm about to attempt another clean ME soon but I've not really had much issues just yet with cleaning ME region this method, maybe this is my...

Just attempted a clean ME with the original bios chip, now it seems to hang on the Apple logo with around 50% of it loaded, whereas it did originally boot into the OS just never log in, nor boot from a recovery USB. I just a second clean ME and it still does the same thing now - Attempted an...

More than likely a stupid question - but will give that a go. I'm not sure if I have any spare boards with usable bios chips to use. Is it best to try a clean me on the original chip before trying on a new/known working spare chip?

So got a 820-00165 here which had a power issue. Liquid found around U7600 replaced that and fixed a trace that lead from pin 15 all the way to D8185. Now it actually powers on, chimes and shows the apple logo. Now I seem to be facing an issue of when I've successfully booted into the OS and...

Hmm chances of this being brain dead. Replaced U7100 - Getting a fluctuation of 0v-0.5v now - Wonder if it's U7210 as I did take that off the board earlier on (don't ask why not even sure myself...) - Will probably look at replacing those too and go from there

I've just managed to take time and have a look at this board - So I tried powering up the unit whist having a USB connected and there was absolutely no activity at all. Getting 3ohms on PPVCC_S0_CPU with 0v. U7210: Pin 1: 2.5v Pin 2: spiking between 0v - 0.02v Pin 3: 5v Pin 5: 4.9v Pin 6: 0v...

Okay will do! Thanks for the advise so far will give that a go on Monday when I have the board to work on. So surprised not a single drop of liquid on this board and it does this, never experienced a failing board without any damage as such

I haven't actually tried to see if it display and powers on fully. I did spot a video that Louis Rossmann put on YouTube of common issues with these particular boards being the cpu phase rail caps spontaneously blow so wondering if that could be something to look for, I won't be near the board...