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07-03-2011 12:37 PM
I have a 90w power adapter from an older notebook that will work with my HP DV5-1015nr. I transport my notebook between home and office. I'd like to utilize the older power brick, so that I won't need to transport a power brick back and forth. The tips on both adapters, of course, are of a different diameter.
My multi-tester identifies that the tip is hot for both adapters. The problem I have is that the older power brick has two wires: core wire (+) and shield (-), and the newer power adapter has three wires: shield that is connected to the core of tip (+), black that is connected to outer part of cylindrical shaft that must be the ground, and white connected to inner part of cylindrical shaft (also negative?).
So do the black and white wires on the newer adapter need to be soldered to the shield on the older one?
07-03-2011 03:39 PM
Just a guess, since it is 90watt, they may have run the extra wire to carry the load, shield is always much larger than center tip wire.
Did you measure voltage and ploarity of all three connections with the brick plugged in?
Tip is always + and ouside is always - on a HP, not sure what the third is, see if there is any voltage on it,
It could also be some sort of sensor wire for the charging system on the mobo.
Better to buy another adapter than smoke the motherboard on the lappy taking a chance.
If you want to chance it just connect the two wires that are on the center and outside. Leave the 3rd odd one unconnected.
probably can be found used for cheap.
07-03-2011 05:19 PM
Thanks for the response.
Using the outer part of the plug as ground (black wire), the center pin (shield wire) reads 19 VDC. I get the same voltage when measuring the inside of the cylindrical part of the plug (white wire). Logically the outer part of the plug (black wire) is the ground, so the shielding and white wires are 19 VDC (+).
Logically the hot shield and white wires on the new plug need to be connected to the hot wire on the older adapter. I just need someone who is 100% certain to confirm this.
07-09-2011 11:50 PM
I learned that the white wire to the inner side of the cylindrical shaft is solely for the power adapter's use: it measures the voltage drop between the 19VDC, feeding this info back to the adapter. But HP adapters just shut down if the voltage drops too far below 19 VDC..
How sad that HP was unwilling to be supportive and provide this information.
05-27-2014 03:36 PM
And my guess that the main concern to HP not providing the information on something as simple as a charger is so that they cannot end up beng held liable for either damage to the decice or person should Mr. Less Than Average Joe mess up the information and electrocute himself or case something to brst into flames Renault ng in a law suit. Case and point the lady who bought a coffee from McDonalds and promptly dumped it in her lap then sued for not being warned. She got $50,000 for that. Same things with choclate bar warnings about trace amounts of nuts, etc... so whereas I too get the frustration I understand their unwilingness to help.
07-05-2016 01:45 AM
Hi, Me too had an old HP laptop charger which died last night. 90w with 2 wire, shilding carring the -ve voltage and the inner wire or the core wire carrying 19+vdc. Now I wanted to make my old laptop work again and needed that type of charger which is not available and tomorrow is Eid hollyday, so I am doomed. I have another HP product (CQ41)which died 6 months ago but the charger remains. Checked working. So I decided to use it for the old one. Still needed to change the plug. so checked for wiring found tree of them, red, white and black.
As I measured the connection with avo meter found black one attached to the pin in the center, red wire connected to inner cylynder and the white one is connected to the outer cylinder. While powered the charger found red wire +19vdc, white wire 0vdc, black wire in the center pin for feedback to the board.
So I connected the white wire to the shilding wire and red wire to the core wire of the old 90w adapter's plug. doing good.