I have one of the newer plasma displays used in the
IBM P70, labeled
MD480T640PG4.
I have traced the wirings in my P75 and P70 for power and I find they
are same voltages but different locations depending on old and new.
IBM did issue ECA on these P70 and P75 portables this involves
replacing basically whole video stuff (cables, new power supply and
plamsa display).
Google should turn up many hits on this.
Like LCD they're built for each use unless you found the datasheets
for those plamsa displays and have hardware to drive them not just
power, the data generation etc.
Cheers,
Wizard
Thomas