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the only one that bootloops the amp meter occasionally is U3200...

the other thing I find strange is that the amp meter will instantly show 20V, but on working macbooks I'm used to it going to 5V for a second and then switching to 20V after. But in this case it's instant 20v no hesitation

Now the port that was restarting the amp meter shows 20V... but it was stuck at 5V before....

This thing is completely trolling me. One minute a port will show 20V, the next it will show 5V, the port next to it will start the emp meter and restart the amp meter. One minute PPbus is at 3.2 the next it's at 12.2V. The ports seem to be playing musical chairs now because it's swapping which...

CC1/2 all look good in diode mode. I'm really stuck on this. Feel like it's probably some really basic shit that I'm missing

I just realised. The ports that are showing 5V are the ports that I did replace the CD32s on

Because I did install two CD3215c006aa51pw chips and now im wondering if that's even correct and might be causing the issues. I also used Q3100 etc. from a different board and the chip is different. I swapped them back now and I'm now getting 20V on two ports and not just one. I'm guessing...

CD3215c006aa51pw is compatible with this board? this board has CD3215c00z98avfqwbh chips. Are these interchangeable?

I injected the line, found C6213 short. Removed. Short gone. Removed bridge on R7271 and MacBook now turns on WOOOO. thank you 2informaticos

Ok just checked, CPU coils are around 1.5 ohms so should be ok The one coil that stands out is 7260 which is a straight short to ground. Shall I inject and see what's up? RAM coil numbers look good. Which one is PCH?

Well crap. Most of the big coils are 0.000V to ground. All the CPU coils it seems. So PCH is toast?

SMC_PM_G2_EN is pulsing yep made short over R7271 and L7220 is now stable. Board is drawing more power now, but no fan spin yet

and the LDOs are the inputs?

Voltages correct on all 4 chips. the 1v1 lines I guess depend on the USB port that's powered. So as long as I had it in the correct port, it was perfect

Sorry, nothing on SMC bypass

Sorry, need to check voltage whoops

Yup. if 0.500 is correct then all 4 chips LDO lines are perfect

strange how one port is 20V 0 amps and the other 3 are 5v and 0 - 0.04a

No sign of life on DFU Looked at all LDO lines on all 4 chips. look good at 0.500 roughly on each line on each chip

actually I just realised PPBUS also pulses but not strong. Every few seconds it'll go down to 12.3 and then back to 12.56 so L7030 is actually pulsing and so is L3895