I took some voltage measurements, though not very systematically.  On the logic board, I measured between ~1 and 3.5 volts (and nothing in places).  On the power board, I got a range of like 0.1 to 3.5 ish to just under 20.  Some of those seem like they must be wrong, but I don't know what to look for in Powerbooks.  The low board voltage is one thing but is there something/somewhere I can look to definitively test the power board?