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Well, you have a problem there. Battery does not like 16v.... Neither does the rest of the stuff on PPBUS_G3H. Replace U7000 and Q7030 / Q7035 all at the same time.

Short on PP3v3 and PP5v rails?

Voltage on PPBUS_G3H?

Resistance between 17/18 and 27/28 of the ISL?? Measure on the legs of the chip and not on the cap or probe points

Not 100% sure but schematic has nothing for PC0R so my guess is PC0R is based off of a reading from something in the IC0R circuit

Look at page 41 of the schematic. R5450, U5450 etc... Check all of that .. Check U5430 and its corresponding circuit as well

I second bad SMC..... Rarely the ISL can cause the PPBUS being 12.26 issue so it's worth a shot to throw one on. If a new ISL doesn't work, replace the SMC

Heat from where and from what? Does it boot? This sounds like a candidate for ASD.. If you don't have ASD try and run AHT by holding down D and see if it pulls any sensor errors

This could be many things... Could be a random corroded resistor somewhere, could be spi resistors or traces, could be SMC, could even be the CPU but let's not go there yet -- Please measure the following -- PM_PCH_PWROK - PPVCC_S0_CPU Both voltage and Resistance to gnd PLT_RESET_L What...

Nevermind, nothing in settings that would cause that..

SMC LID voltage is changing when you open and close the lid right? Maybe something in settings telling it not to sleep when the lid is closed?

Disconnect the trackpad and hit the power pads and shut it down from software. Does it do the same thing?

I don't know.. Intermittent faults like this are never fun. Maybe corrosion under the SMC.. Look under it with the scope.. If it looks like something got under it give it a reflow.

Also, have you tried with a known good trackpad and trackpad cable? That can cause it too sometimes

So if the display shuts off, the lid sensor is working so we don't have to look there. My guess is something wrong with U5110 or the SMC. Maybe even a leaking cap on SMC_ONOFF_L somewhere. Did this have liquid? If so, where.

So spinning up and down consistently like a RTC reset right? Does vcore pulse too?

Don't touch the SMC yet!! Kill JTAGs as your heart desires..

Do you have PLT_RESET_L??

Could be something wrong in the boost/sense circuit, but now sense you lost green light did you loose 3.42? While the green light is not working, what is resistance to gnd compared to when the green light is working. Basically what I mean is catch the system when the light isn't on, unplug it...

Something is obviously pulling down PP3v42... Look at U7001. Do you have ACOK on pins 1 and 2 and do you have ACOK VCC on pin 4? See if something is messed up there. Maybe U7001 is pulling down 3v42 and causing your no green light issue. Don't know how that would be related to your battery issue...