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OK I just replaced a dc power jack on a hp/compaq nx7400 system board. The replacement jack doesn't exactly match the original so i had to mod it a bit. http://cgi.ebay.com/OEM-REPLACEMENT-DC-POWER-JACK-HP-COMPAQ-NX7400_W0QQitemZ110289847820QQihZ001QQcategoryZ158847QQcmdZViewItem Now my ground is not connected. A schematic of the power section of the system board would be fantastic so I would know which pins to connect to 18v, 19v, and ground respectively. Can you help?

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  • auriuman78 Oct 04, 2008

    I am an electronics tech w/assoc degree, i just cant find any technical info out on the net about this fella here. Thanks!

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Dude.. you're way too deep into the subject so I honestly don't think you may get your answer here unless an actual technitian from HP may be able to get that info him/herself for you..

the best I can probably suggest is this.

1. I would probably give tech support a call to have them provide some suggestions (you may have to pay for the info)

2. check with the manufactorer of the motherboard (I don't know if it's hp/compaq or another company that supply that info... now is possible that the info may be propiatery so may not be avaliable to the public

3. try this website http://www.supplyframe.com/datasheet-pdf/search/DC%2520POWER%2520JACK%2520HP%2520COMPAQ

if needed this is the service manual for your laptop.. but I could not see anything as specific/detailed as your question.. but here it is if you need it..
http://bizsupport.austin.hp.com/bc/docs/support/SupportManual/c01035648/c01035648.pdf

sorry I was not much help.. if you find the source of your info once you found it.. post back and share your source if possible.

Posted on Oct 04, 2008

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Compaq CQ1-1225 AIO Wont Start at all. Removed all components


Suggestions;

Anti-Static wrist strap connected to ground source, and your wrist;

1) The jack your AC adapter plugs into on the motherboard, is the DC Power Jack.
Motherboard out of case, power to motherboard, take your multimeter and see if you are getting 19 VDC at the DC Power Jack's positive solder joint, on motherboard.

The center pin of the jack is Positive. (The inner cylindrical shell is Negative)
Follow the DC Power Jack's positive pin from the Center of the jack, to the motherboard.

You probably won't be able to touch your meter's Positive (Red) probe, to the DC Power Jack's positive pin under the jack; so touch it's solder joint on the opposite side of the motherboard.
(DC Power Jack should be soldered close to the motherboard, is why)

Of course also touch the Negative lead, (Black probe), of your meter, to the Negative, (Ground) solder joint for the DC Power Jack.

Getting 19 volts DC?

See if there is a cracked solder joint, for any of the DC Power Jack's pin connections to the motherboard.
ANY perceptible movement of the DC Power Jack on the motherboard, indicates a bad power jack, and may indicate a broken/cracked solder joint.
Center pin of DC Power Jack is loose? Bad DC Power Jack. Replace.

2) DC Power Jack is determined to be in good repair? No cracked/broken solder joints?
The next components in the power circuit on the motherboard, leading From the power jack, are P. MOSFET's.
Power MOSFET.

Power MOSFET Wikipedia the free encyclopedia

More information using a prior solution,

Dv6000 power light does not come on any more

Check the links given.

3) The last thing that concerns me, although I probably should have listed it first; is the AC adapter you are using.
Concern is that it doesn't have the 'intelligent chipset' that matches the Compaq CQ1-1225 All-In-One desktop PC's circuitry.

AC Adapter For Compaq Presario All in One CQ1 1225 Desktop PC Charger...


Just my thoughts..........
Regards,
joecoolvette

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Could be a back power brick or DC jack yes. Power off the computer and remove the battery. With the battery out plug in just the power brick and turn on the computer. If the computer doesn't power on gently wiggle the plug into the laptop and repeatedly hit the power button if it comes on briefly then off again you dc jack is loose. If it doesn't come on at all then its the power brick. If the laptop comes on gently wiggle the plug into the PC. Powers off while wiggling DC jack.

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Hello!

Im assuming you are asking what the part number or model number of the motherboard is, to answear that it is:

417516-001 - HP Compaq nx7400 Series Laptop Motherboard (System Board)

if you need to buy one, a refurbished one is here, with the current number of them instock at 5.

http://underbid.com/product/461-969/417516-001+MB+N/417516-001_-_HP_Compaq_nx7400_Series_Laptop_Motherboard_System_Board_New.html?ref=base

I hope this has helped you!

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This is HP Support, and the Service Manual download page for the Compaq Presario V2000 series Notebook PC's,

http://h10025.www1.hp.com/ewfrf/wc/manualCategory?lc=en&dlc=en&cc=us&lang=en&product=500508&

Left-click on, Compaq Presario V2000 Notebook PC, HP Pavilion dv1000 Notebook PC, HP Compaq nx4800 Notebook PC - Maintenance and Service Guide.

Page 166, or Section 5.20 details System Board (Motherboard) removal.
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One example of a place to buy another DC Power Jack,

http://www.dcpowerjacks.net/catalog/product_info.php?cPath=3_4&products_id=121

Information that may help you in replacing the jack,

http://www.laptoprepair101.com/laptop/2007/12/06/dc-power-jack-repair-guide/

I do this procedure quite a lot. If you find you need guidance, simply state so in a Comment.

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You could possibly have a loose dc jack.Being able to wiggle it around and getting it to work tells me that the jack is probally going out.That wiggling your doing can cause an arc on your system board,which can short out your board.Stop wiggling your power supply adapter in your dc jack and take your computer to certified repair shop and have your jack checked.Best to rule this out first ,so no damage is done to your board.If you jack test good ,then replace you power supply....Good luck

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