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Sounds like a bunch of bad SMCs, Just to be safe check R4999. Any power on pin 2 ?

Well Done !!

Replace with 216-0810001.

I go one step further and provide free Apple diagnostics to whoever. I even have a diagnostic point in our reception so any tom dick and harry can come in plug their Mac and walk away with a diagnostic checkup. And yes, my direct competitors also come and use it. I'm totally cool with that...

Just checking f anyone had any decent chips come through especially the 9000 & the 0005

Quite easily. Do you have a Diskwarrior 5 ? Just to rule out software issues, have you tried booting with a known good volume ?

I've seen this with corrupted filevault volumes. Diskwarrior can usually fix this if the original volume can be mounted. no idea about "AMD-Action:authenticate:SP"

U4510 without any input power could be a problem. Check if any power on pin 16 of U4510?

ok, then lets start by checking R4533 - 36. Does U4510 get 1.5V on pin 6 ? Also there are lots of shitty third party HDD flex cables . You tested one of your new ones in a known good laptop ?

This usually happens with a bad/failing internal HDD. You need to run ASD on this.

No not necessarily. You've got more measuring and inspection to do. So, you have ppbus_g3h, PP3v42_G3H &, PP3v3_s5 & PP5v_s5 ? There's plenty of paths to ground for PM_SLP_S4_L to escape other then through the PCH. I would still look for corrosion somewhere, the amount of times I've found...

Any chime after PRAM reset ?

Do you get PP0V75_S0_DDRVTT ?

Have you checked for shorts on PP3v3_s5 rail ? If none are present whats voltage on pin 5 Q7221 ?

Whats the value of ALL_SYS_PWRGD ?

Battery is toast too.....

MRI is reporting these missing sensors. Im doing another iMac tomorrow, so will take pictures and PM you those. Do you have AST server setup ?

I got +60 of these out there now. With zero comebacks. Lately I've been reballing 215-07980006 chips to leaded before soldering. Getting better results with the chip sitting flat on the card, otherwise was difficult getting the corner balls to melt. One thing to point out diagnostics indicate...

Farm this out to soneone who does BGA rework. Let them provide the chip. Ive had good results in buying PCH chips. But you'll struggle to make your BGA rework machine pay.

Ive seen this a number of times. If you loom at the copper contact point o the heatsink it will be depressed. Causing a short on the caps. Replace heatsink. Its a simple fix