HP Power supply PPP012H-S / 384020-002 compatibility with Pavilion DV5000 (DV5196EA) notebook?

Question

I have a Pavilion DV5000 (specifically, DV5196EA) notebook where I need to replace its original power supply.
I also have an HP power supply from some other notebook (I don't recall what kind) which shows the same output specifications (19V, slightly higher wattage than the original), but it has the wrong physical plug on the end.
The original power supply has a tip similar to this:
The other power supply that I have, from some other notebook, has a larger tip which looks like this:
(Apparent sizes are incorrect in the in-line image uploads above -- the actual tip on the PPP012H-S power supply is about twice as wide as the tip on the original power supply of my DV5000 series notebook).
I tested both power supplies using a multi-meter, and confirmed that the power output of both is 19VDC.
I clipped off the current large barrel end from the PPP012H-S power supply and stripped the wires, intending to solder on a common replacement tip which matches that of the original power supply, but I found a surprise when I stripped the wires:
There are three conductors inside the sheath of the PPP012H-S power supply. An outer heavy braided shell just inside the outermost rubber-plastic insulating coating, inside which is another smaller gauge rubber-plastic insulating coating, with innermost two more normal insulated stranded wires - one in white and the other in blue.
I had assumed that the outer braided shell was either ground or EM shielding, but in fact it's a conductor. Using the multi-meter I found a 19VDC differential between that outer braided shell and EITHER the inner white or the inner blue wire.
And one more weird thing. Switching the multi-meter now to resistance mode, I had expected (given the voltage detection above) that the large thin barrel of the PPP012H-S adapter's tip would share one electric potential both outside and inside the barrel, with the very find centre pin being the other pole ... but no.  There are apparently three conductive surfaces; the outside of the barrel, the inside of the barrel, and the centre pin, none of which are connected to each other.
Not wanting to guess that the power supply might like the idea of shorting the white and blue leads together, and observing (I think?!) that the tip of the original power supply has only two conductive surfaces, and therefore guessing that even if the PPP012H-S' intended notebook might care about whether it was being fed from white or blue the DV5000 would not care, I insulated off the white lead and soldered the outer braided shell and the blue lead to the new tip. Multi-meter again confirms a steady 19VDC in the correct polarity.
But when plugged in to the DV5196EA notebook, the notebook does not detect any power being supplied.
Crap.
Is there some kind of electronics smarts in the PPP012H-S power supply which makes it detect and refuse to supply power to the DV5196EA notebook? Or some not-quite-so-smarts but which still really wanted me to use the white lead instead of the blue lead? .. or is even the simpler tip on the original adapter (which I believe has only two conductive surfaces) actually a little less simple than I think and it does have three surfaces and I do need to attach all three of the conductors from the PPP012H-S to (Something, where?) on the replacement tip?
Yes, a bit of work to go through to avoid spending $50 on a new power supply, but I've got the parts and I thought I had the smarts and I enjoy the challenge (up to a point!)
Thanks for your help!
-Jay

Answer 1

can anyone tell me the pinout of a ppp012h-s power supply please?