Having problems with your HP Pavilion zd8000 Notebook ?

HP zd8000 laptop power supply

\015 My zd8000 power supply has failed and I want to adapt a normal 2 wire power supply to power it. The HP power supply is a three wire one, 0v, 19.5v and -here is the bugger- a midle pin labled ID. Unless the ID pin is satisfied the laptop will not power up or even show a power light. I know it is not the laptop as I have 2 identical ones bought at the same time, so I can test them.The question is what must the zd8000 have on the id pin in order to work, or how do I make a two to three pin adapter cable.So far I have tried 0v and +7v - no dice.ThanksAndrew Parsons\015

Answers :

I found the solution - and implemented it, it works. The blue (ID) line needs to show 7.5v. The simple way to acheive this is to simply put a 47k resistor from the +19.5v line to the ID line. Apparently there is a pull down at the computer end that means it ends up at 7.5v.

I cut the cable about 6" from the old HP power supply. I then soldered a female power socket onto the loose cable and soldered the 47k resistor between the ID line and the +19.5 line. I then plugged this onto my two pin power supply and the plugged it into my computer. It works very nicely.

Not wishing to junk the HP power supply unecessarily - it was still producing the 19.5v - I then soldered a power plug onto that ignoring the ID line. That now works as well. It seems that the circuitry that provided the 7.5v ID voltage in the HP power supply became flakey. I could have just opened up the power supply (I have already done that) and disconnected the blue line from the circuit board and just tied it to the +ve line via the 47k resistor and then wrapped it with the usual insulating tape.
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