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Well I'd say your sierra installation is corrupted or even malicious, where did you get it from? I highly doubt under normal conditions it can damage the BIOS in a way it requires to be reflashed. If you compare the bios dump before the sierra install and the (corrupted) bios dump after the...

What do you mean shorted to ground? With L7130 removed, is the short on Pin 1 or Pin 2 on the board? Resistance to ground in Ohms?

A brain and two-factor authentication on their apple account

Check for a short on one of the S0 rails. BIOS Area looking alright?

Anything can happen with those chargers, I've seen bad USB devices kill random ICs or causing board issues before as well though, so it could be.... If it works now I'd say its resolved, but definitely get the customer to stop using the shitty charger!

If they managed to knock off a complete coil it might be missing more, inspect the board. Can you upload a screenshot (or picture) of the kernel panic with the text visible? Did you already try a known good installation so we can exclude it being a damaged hard drive or OS?

Ask the customer for the EFI Lock password or if the login in OS X allows you to select "Other user" you might be able to try to login with the "root" user trick (User root, password empty. Try this two times), the device might not have updated yet :)

Don't get stuck on the PPDCIN_G3H not being 20V. The schematic is not always right (and also I assume its written as 20V just to make sure the engineers design it to handle up to at least 20V). 16.6V sounds about right and if ACOK is high don't worry about it. How is PM_BATLOW_L doing? Voltage...

I think it should be alright as long as it fits in the case. The battery will communicate about its needs to the SMC and most importantly the ISL so I don't see any reason why they won't be interchangeable

Hm apparently they have a low limit for DC-In, I thought they hadn't (in the older models I'm almost confident they hadn't) but maybe my mind is wrong. Anyways they can still be ignored as they're just related to DC-In, no worries

Just use something like Intel Power Gadget or one of the other tools available for OS X. But whats wrong with the machine? Because other then the one error from ASD by using a 85W/15" charger it sounds like the system is working fine isn't it?

20V or even 20.7V is definitely higher then I would expect from a 85W magsafe 1 charger (are you using an genuine charger from apple?), but the ISL should be able to handle input up to 25V and all the capacitors and components on the circuit are rated for 25V or better. I don't think it will put...

VD0R is simply too high because you're using a charger for a 15" macbook, this can be ignored and should not cause the SMC to run the CPU at a low clock speed. It will probably go away when you unplug the charger :)

Overlooked PP3V3_S4SW_SNS which is not being created because SMC_SENSOR_PWR_EN is low. Its also not shorted to ground which still makes this an SMC issue. I've never seen this issue before, any idea why the SMC is keeping SMC_SENSOR_PWR_EN low? I have Vcore by the way, otherwise there woudn't...

Board seems to have been touched by idiots before but I can't find any solder marks, only heat around the CPU (but nothing is melted so I assume it was below 200C) System has PM_S0_PGOOD but is missing SMC_DELAYED_PWRGD and thus does not boot. SMC_DELAYED_PWRGD is not shorted to ground Other...

Time to find a new supplier, anyone who ships out stuff like this (other then maybe a one off mistake) shoudn't be on your list on main suppliers. Personally if I want to get a part and know it will arrive well, I buy from Jack Telecom where I have a contact at who is more then willing to do...

BKL_PWM voltage?

You can fix a corroded trace by soldering a wire from point A to point B (In your case from C7541 to C7500), its most likely internal so this is the only option.

Like ielectron said, if its not the GPU now it will be tomorrow. but Q9560 is the high driver mosfet for PP1V5_GPU_REG so it probably killed the GPU anyways

Could be possible, I'll see if the speakers fit or if I maybe have 2011 speakers and of those will fit. I might contact you about that case, thanks for the offer!