Here's the results with all 4 pins on J17 connected to the battery and with the power supply connected:
Right after I reconnected the battery I read 1.22V on the comparator green pin, .06V on the red pin, 7.51V on the yellow, and the blue pin now reads battery voltage at 6.45V
the op amp to the left then showed green 1.22V, red 1.49V, yellow 0V. I then was able to get the short squeal from the speaker, and a sad mac on the screen but not every time. I could unplug the charger maybe hit reset and sad mac would show and disappear - maybe unplug the battery, plug it back in, hit reset, then press space bar and sad mac would show up again! Crazy
Today after the board was plugged in for awhile I noticed the reference voltage on the comparator (green) reads 0.65V - the red is still 1.49, the yellow is 7.51V, and the blue pin still reads 6.45V.
Seems like something is degrading
It might be the "painted" resistors.
On mine they are degrading, even after the mainboard got recapped and everything got thouroughly cleaned with ipa and distilled water.
The portable still boots, but is saying the battery is low, and then most of the times will shut off, eventhough voltage on all the pins of the power connector is close to 7 volts with the charger connected.
The resistors are those black "rectangles", usually with one or two tiny small scratches in it (done to reach exact resistance I assume).
Blow is the picture of the hybrid when I got the portable (and it was working perfectly, before the recap).
After I recapped it, and super thoughly cleaned it, the hybrid kept deteriorating to the point where the rectangles are now sort of rounded...
I'll see if I can make a picture of the current state, then you'll see what I mean.
So, now I have one of the replacements made by Androda on the way (stuck in customs at the moment, almost here). That should fix it!