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DV7 power adapter

post #1 of 6
Thread Starter 
I just cut the wire of my DV7's power adapter, and I cannot figure this out. The wire is double shielded, with the outer shield being ground, the second being +19v, and the middle being 19v, but at such a low amperage that I cannot get a good measurement on a digital meter. What is this used for? I left it disconnected and the thing is still running fine, but it worries me a bit.
 
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post #2 of 6
I'm guessing, but I think it could be a feedback wire since the lappy can run without it (it can't be anything that affects functionality). It is probably used to turn on/off the charger while the lappy doesn't need power, like when it's unplugged or shut down with full battery. This way it would cut the idle consumption of the charger when it's not powering anything.

As long as the lappy runs fine, you shouldn't worry. Look for signs of overheating on the charger though, and if possible try to connect that wire, too. It probably has some use since it was there.

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post #3 of 6
Thread Starter 
Quote:
Originally Posted by dragosmp;11725170 
I'm guessing, but I think it could be a feedback wire since the lappy can run without it (it can't be anything that affects functionality). It is probably used to turn on/off the charger while the lappy doesn't need power, like when it's unplugged or shut down with full battery. This way it would cut the idle consumption of the charger when it's not powering anything.

As long as the lappy runs fine, you shouldn't worry. Look for signs of overheating on the charger though, and if possible try to connect that wire, too. It probably has some use since it was there.

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That makes a lot of sense, but if it were a feedback wire, wouldn't it have no current?


I just noticed that the little LED that lights up when the charger is plugged in is not on. It would make no sense to run a dedicated wire to it though.
 
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post #4 of 6
The power cable on my dv7, which translated into my computer was loose from day one. May have been thinking about this generally, I did not report this to HP. Eight months later, eventually it burned the post thats the cable plugs into. I did not notice the condition of the item inside Until I went and bought a new power supply and cable, which at that time cost $ 60 on sale at Best Buy. I still would not work so I contacted HP, the computer FEDEX'd for themselves, just to have them say that it was not covered by warranty. I was always thinking that any defective part which was in accordance with the manufacturer was under warranty. I was wondering if anyone else had a problem with HP is standing behind your guarantee. If this is not just a remote, I can not see how HP can stay in business. I know that if HP refuses to make some type of adjustment of this part, I will never buy anything from them.
post #5 of 6
Quote:
Originally Posted by foothead;11726407 
That makes a lot of sense, but if it were a feedback wire, wouldn't it have no current?


I just noticed that the little LED that lights up when the charger is plugged in is not on. It would make no sense to run a dedicated wire to it though.

If it's a feedback wire, yes it shouldn't have much current; however, since they built that wire (probably for feed-back) they may have decided to use it to power the LED. This way the LED is on only when the lappy is plugged in, and not when the charger simply sits idle (like my Acer charger's LED that is always on even if the lappy is connected or not).

My opinion is that since this wire is no longer connected, now your charger is always on, like the one on my (much older) lappy. If you'd have a Kill'a'Watt you could check the power consumption of the charger without connecting the lappy - with and without the feedback wire. Most likely without the feedback wire it would consume some 4-5W and with the wire it would be below 1W. Sub 1W idle power consumption is a requirement in the EU starting form 2011, in the US it may be the same.
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post #6 of 6
i had a dv7 laptop for about 1.5 years! first thing i saw was the laptop losing power right in the middle of using it. i found that the ac adapter was discharging... thus wouldn't work correctly! this was right after the hdd failed the first time! i took it in and under warranty got a new hdd put in less than 3 months later that hdd dies yet again won't pass a hdd bios test! the cd rom tray broke and still has my knoppix live cd still in it!! :devil:i think i am going to pry it out since the cd is worth more than the laptop! frown.gif

i also find that the new ac adapter i have had for around 1 month was charging the laptop... since when i am at school i usually take the battery out and run as ac... the battery was fried no more than 1 year after i got this dumb laptop! i would say out of all my laptops over the course of my life that the dv7 was the worst series ever! mine even at school in the cold ass server room overheated!!! i don't think i will ever buy an hp product again!mad.gif

between overheating due to bad design flaws and cheap components i found my laptop experience to be rather dreadful i started really going paranoid after working on my video game for class my hdd failed i started waking up at night and making sure my programs where backed up mutiple times over not only on drop box but on an external raid 1 nas and on my desktop at home!!!kookoo.gif i am not surprised when you have this issue! the ac adapter on the mobo became loose on mine! towards the end of its life, if say someoncnext to me pounded on the table harded my laptop if off would turn on and if on would turn off!! after awhile of it doing that i was going to call up hp and start saying how they should put that on as a feature!! applaud.gif
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