MacBook Pro not booting up after teardown

Sounds like you might have over done the thermal paste getting it over the small components on the top of the green chip carrier. What happens is the thermal paste is still slightly conductive (even the best like [gekoppeld product ontbreekt of is uitgeschakeld: IF179-010] and some are very conductive! Like Thermal Grizzly Conductonaut liquid metal thermal which you should not use in a laptop at all!

Basically, the paste messes up the logic signaling. The quantity needed is so very little from what we perceive is needed given what we think. I often see people have over done it and even Apple and other companies tend to be sloppy too!

So how much is really needed? Think how big a piece of plastic food wrap needed to cover the black silicon chip would be if you pressed it into a ball, Yep! That tiny! About one-eighth of a new pencils eraser in size. Remember this is just used to create the interface between the two surfaces and is very thin as its compressed!

You’ll need to open the system up again and carefully lift the black bakelite insulator that surrounds the chip (both CPU and GPU) clean off the paste which has squeezed under. You’ll want to use a some paper towels and soft toothbrush to pull off as much as you can and then use a chargeable spray can like this one TITAN TOOLS Refillable Spray Bottle to then forcefully spray 95% or better reagent grade isopropyl alcohol as you’ll need to make sure you’ve cleaned around the small SMD devices being very careful not to lift any as that would be the end of the logic board.