I recapped a Mac Portable a few days ago but it's having power issues on the +12 volts line. All SMD caps have been replaced, the radials and axials too.
It works but not from a fully charged rebuild battery. However when I plug in the power adapter, together with the battery, it does boot.
When checking the battery level indicator under OS 6.0.8: it's full with the power brick connected, however when I unplug it, it goes to empty in 1 minute and automatically shuts down, while the main battery still has 6.5 volts on it.
In my other Mac Portable, the same battery yields at least another 2 hours, so the battery is not the issue.
When I test the +12 volts line at the FDD connector or on C3 ( 220uf 25v ) I measure only 11.6 volts, which is too low. On my other Mac portable, that's 12.05 volts.
I think this is the culprit of the problem. I have tested D1: ok, C6 and C3, VR1 are replaced, L7 checks fine for continuity.
Even with the bare board and power adapter connected, on my bench, I only get +11.6 volts on C3, which is too low.
I hope someone has encountered this problem and can pinpoint me to the solution.