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at that point you have changed just about everything, I don't see why the CPU wouldn't be next on the list. can it boot into a windows OS or ubuntu?

which battery? A1377 or A1496? Does it have any funny sensor readings if you use hwmonitor ?

If SMC_LID is 3.4v, and you resetting PRAM doesn't fix it, you have two choices. 1) Replace the mux on a board that will be back with a dead GPU in 1 month, when they will ask for warranty on your "failed logic board repair" that you can't provide. Make no money, deal with raging customer. 1...

Most likely.

My only guess is you are plugging the cable in upside down.

What voltage is on L7701, pin 1 and 2? What voltage is on D7701, pin 1 and 2?

That's one for the junk bin I'd say.

Definitely bad NAND. I haven't tried swapping it yet, so not sure. It has been on my to do list, but most people seem to decide to chuck these if we can't get their data so haven't been able to.

Have you tried with a new DC-IN board and cable?

Are you testing this with a known good screen attached?

Is this with a known good KB and IO board?

Measure voltage on pin 3 and 4 of J8300 with the LCD plugged in and please tell me you are using a 2015-2016 LCD as 2013-2014 or 2012 won't work properly with this year.

Likely, or corroded solder ball under there. I've had a few like that on the 3330 cured with a mild PCH reflow with some flux, but wouldn't try that on the wimpy CPUs here.

Bad battery.

Is PP3V3_S5 present or not?

We can't really distribute schematics here, Apple already breathes down our neck. This would be same as anything else, need info on which power rails are present and which aren't to go forward.

I believe that is internet recovery, not built into the drive. I would most likely imagine dead memory. What happens if you boot into a linux install and dd if=/dev/urandom of=/dev/whateveristheinternaldrive and then try to erase the drive from normal internet recovery?

This is done for.

Could be thunderbolt circuit, could be corrosion under SMC, bad BIOS traces, firewire chip... that board is terrible looking.

BKL_EN should be around 2.7v . You had 3.3v then 0.04v, that is confusing. There is something simple missing here, bad feedback or switch, I imagine it is the switch trace that is missing due to 0.580. 0.511-0.546 is normal, 0.450-0.511 is bad feedback, over 0.556 is usually switch trace not...