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A quick addition to this, just in case it triggers any ideas...if I fully disassemble the system...then reassemble it, it works perfect initially. Powers and boots on the battery. On the cable. I did this last night. But then I closed the lid and let it sit powered off until today. Came in and...

Ok, I will check both of those and report back. Thank you all for the ideas and guidance!

I just looked at the I/O connector on the logic board under the microscope and two of the pin's backs...the exposed area...are discolored and corroded in appearance. Could that connector cause this kind of behavior? It wouldn't seem it would have any influence on the logic board using the...

Yeah I am admittedly feeling stupid for not examining the board under the microscope prior to the ultrasonic. On a quick side note, I forgot to mention I did try a different I/O magsafe board and also a different keyboard cable. Louis the bulk of the liquid was under the battery on the...

It is. You can watch the percentage increase, I also have a diagnostic I run that reads and tests the battery, which comes back fine. Once the system is up you can also unplug it and it will run with no issue. It just won't power up from the battery. After the second trip through the ultrasonic...

This system came in for liquid damage...was not turning on. It powered off the power pads. I replaced the keyboard and trackpad....they took the bulk of the liquid spill damage. There wasn't much on the board itself, but ran it through the ultrasonic (setup per Louis' instructions) just to make...

Louis speaking of parts...what is your philosophy on how you order and stock parts? I keep things like certain batteries, adapters and storage stocked...but have been skiddish to stock much else since the type of systems I get always seem to come in waves.