Laptop Power Supply "Smart Pin" ? - HP Support Community - 539383

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• Laptop power supply "Smart Pin" ?

Laptop power supply "Smart Pin" ?

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Entire CommunityThis CategoryThis BoardKnowledge baseUsers cancel turn on suggested results Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Showing results for  Search instead for  Did you mean:  Start a conversation Guidelines Seize the moment! nominate yourself or a tech enthusiast you admire & join the HP Community Experts! Nominate here! Please log in to submit a nomination. Thank you Sorry, there was an error with your nomination, please try again. Required fields can't be empty, please try again.

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Your account also allows you to connect with HP support faster, access a personal dashboard to manage all of your devices in one place, view warranty information, case status and more. Sign in / Create an account Learn more Sign in / Create an account / Learn more This topic has been archived. Information and links in this thread may no longer be available or relevant. If you have a question create a new topic by clicking here and select the appropriate board. k7qlk7ql 2 0 0 69,795 New member

‎02-23-2011 10:07 AM

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Hi All,

I'm an electronic hobbyist and wanted to use a surplus HP laptop power supply as a power source

for my experiments. It is a large 'brick' rated at 18.5VDC @ 6.5AMPS, I think (sorry I'm at

work). When I cut off the DC plug I was surprised to find a COAX type cable with 2 shields and

a center conductor. After a little surfing I 'assumed' that the third wire is the center

conductor, or the smart pin. Cannot seem to find how the "smart pin" works. Anyone know of a

link as to how this works so I can be "smart" about using this power supply? All I'm looking

for is some nice, regulated DC.

Buy the way, I own 3 HP laptops and administer hundreds of HP servers at work. Wouldn't buy

anything else!

Thanks...

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View All (2) 3 REPLIES 3 k7qlk7ql Author 2 0 0 69,753 New member

‎02-23-2011 10:49 AM

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I did manage to find this discussion...

http://www.techspot.com/vb/all/windows/t-137840-Smartpin-power-connector-HP-6715s.html

engr_kef 1 0 0 64,515 New member

‎02-17-2014 05:38 PM

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Hello friend, ignore those websites just cut your hp charger, u will see 3 wires which are the first layer, second and third. Cut off the third layer to prevent shunting cause it almost damage my laptop. Connect your positive to the second layer and negative to the first layer and that solves the problem. Can also be used on dell laptop chargers too. Tested and confirmed. Don't forget to cut of the third layer first. Kudos NicholasLEby 1 0 0 56,743 New member

‎10-25-2015 04:47 PM

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Hey, did you ever find a solution for this?

I'm using a similar HP power supply (19.5vdc) as a DC hobby adapter for model trains. I cut the cable just before the barrel jack and revealed the 3 wires (white, black and blue), then used a multi-meter to determine volatages on each wire. I ended up only needing the white and black, but wondering what I should do with the blue. It reads 19.5 vdc as well. I think I read other people were opening up the brick and disconnecting it from the board in there. Thoughts? Thanks!

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