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Usually you can start at 200 and move up until it starts showing you a result. In this case R5187 is supposed to be around 470KOhm, so you should select 2M.

What does Apple Diagnostics give you for error codes? Do you have completely assembled the board into its casing? Otherwise it will indeed run at full speed because various sensors (like in the trackpad) won't be connected.

SMC_ONOFF_L high? SMC_MANUAL_RST_L high? R5100 within specification? If yes to all, I'd say replace U5110

If you want to be sure about the power lines / tantalum capacitors attach an oscilloscope to that line and keep eyes on whats happening as it crashes. (Have a big enough buffer so you have time to manually trigger it) What does the kernel panic give you? I've yet to come across a 820-3437 board...

SMC_PM_G2_EN high? Voltage of PP5V1_CHGR_VDD and PP5V1_CHGR_VDDP? Resistance to ground on PPBUS_G3H in Ohms? F7040/41 fuses not blown? P3V42G3H_BOOST being 'too high' is probably just your multimeter getting confused by the switching, if PP3V42 itself is alright then no worries about it.

Apple is really stepping up their game! 114 euros for a charger! Imagine buying a 1500 euro laptop and then needing to pay over 100 euros for a second charger, something that costs them barely 10 euros to make. Just incredible

Did you do the S3/S0 measurements like I said? Again if PPBUS is moving around to way above >13V you most likely didn't solder it well, have malfunctioning mosfets (Unlikely, but feel if they're burning hot to make sure. Especially check the one for the low switching) or are having a broken...

What is the resistance to ground on all S3 and S0 lines in Ohms? Please report

If you get a quarter spin you are actually moving into S0 for a little moment as the fan will only be activated in S0. Will the machine POST (chime) on battery? If it does then your ISL circuit is still messed up. Otherwise see if you may have a short on one of the S3/S0 lines.

You need to buy a dead board from china with a hole in it and hope the SMC on there works. Remove the chip from the china board and reball it before placing it on this motherboard. Its a pain in the ass but probably the SMC, an internal trace issue or the unlikely scenario of the keyboard...

No Title Check this latest capture from the osiloscope! This time I'm not checking the PGOOD signal but the actual VCore voltage I'm really starting to think U7200 is at fault as well, going to resolder it in a moment :) EDIT: Resoldered it with just the iron but no luck, its not posting...

I have absolutely no idea what "6 of temp" would be in reality. Usually you'd put the air on something reasonably low so the flow doesn't come flying of the board the moment you get the hot air station near it. "6 of temp" does that usually make the lead free solder melt? Usually if I really...

I'm surprised, you got this board from a recycling centre that had part(s) missing and you managed to actually make it boot? Alright You don't need the old bios, but you do need a clean ME region. There are tutorials about that online, just google something like "Macbook clean ME region...

Any chance you have a oscilloscope to see if PM_SLP_S4_L is pulsing?

PP3V3_S4 is that voltage drop in diode mode or trace voltage? Resistance to ground in Ohms? Honestly no idea what this could be, check the board for any ugliness or missing parts. Take your time with this as they're sometimes hard to find

If PPBUS indeed gets to 15V you might want to check your soldering, especially to pin 21 of U7000.

Could be crap underneath the SMC, try a reflow with a nice amount of flux to hopefully get rid of it. Does the trackpad connector look alright? C4834 looking alright?

Don't just swap the BIOS from another board like that without flashing it with a clean ME region, 99% sure this is the cause of your issues. If the old BIOS chip had nothing wrong with it place it back Search for it on this forum on how to write a clean ME region, it has been explained how to...

You can't just swap over the ROM chips like that, even if you get exactly the same model the ME region won't match and will cause weird crap. If the working BIOS is from the same board you can leave it on, but you really have to get a clean ME region on there

The crashes have actually changed in behaviour... Before: 8/10 of the time it would directly fully power off 2/10 of the time the screen video would disappear (blank/black screen), audio stopping but the backlight and fans still rolling for ~5 seconds before it fully powers off Now: I've been...