Question about HP Compaq tc4400 Notebook
Hi, I have a auto adapter to power a laptop with different tips. There wasn't a tip that fit my laptop, so I brought the appropriate tip only on ebay. The auto adapter outputs the correct voltage and current (18.5V, 3.5A). I cut the tip adapter from the auto adapter and there are two whites - one red one black. The wires from the new tip I need to add are one black, one white and a much thinner red one. Which wires do I connect?
You may look the jack(tip) show here:
1) your car adapter, the red color wire is + pole which connect to the hole of jack(tip), the black wire is - pole which connet to outcover metal of the jack(tip). that is very common.
2) your new jack: check as smae as above. usually white color connect to red color, and black to black is ground connect to outcover of tip.
then you need check again the voltage pole, the tip 's hole should be possitive "+" and the outcover metal is negative "-" pole, it is very important.
hope help you fix it, please feedback any question any time, pleaae take a rating let me know how much helped you thanks!
Posted on May 28, 2009
I tried to do a similar hookup with an old AC power supply and a new laptop jack as described above for my HP/Compaq 8510p. My old power supply ouput wire (laptop side) consists of a coax style two wire arrangment so I hooked up the black wire of the new connector to the outside wire of the coax and the white and red wires to the center wire. Check the voltages and it seemed to work but the CPU is now at 100%! So more work to do.
Posted on Jul 13, 2009
Unfortunately, I think that frankzjm is right. Your HP laptop is designed to use a "smart" adapter which has the ability to transfer information between the power supply and computer. Basically, it would appear that a different voltage is sent if the computer is both running and charging the battery, where a lesser voltage is sent if only powering the computer. Of course, current draw is varied based upon need through normal electronics. Net effect, it is not a simple plug, give power, and go. The third thin wire is used to communicate between the power adapter and computer. Your car adapter does not have the logic circuits to handle the communication.
Of course, HP does not seem to be very open on how this works (at lease from what I can see). It may be possible to set the power supply for its "opearting only" voltage and trick the control wire (small red wire) by sending the appropriate response to the computer for the adapter to say "I'm OK," though I would need to play with a smart adapter to figure out how exactly to do this. I may take a quick look at one of the HP laptops to see what might be possible, but it may be best to get an officially sanctioned HP car adapter.
Posted on Jun 02, 2009
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Posted on Jan 02, 2017
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