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Thread: Laptop hardwire?

  1. #1
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    Laptop hardwire?

    Does anyone know a way to rig a laptop so that it is "always on"? I want the thing to boot whenever there is power going to it. It doesn't have a working battery and I when I unplug it, it goes off (obviously). But when I plug it in, I have to push the power button and I don't want to have to do that. Any thoughts? Thanks!

  2. #2
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    Check your BIOS and power profile settings. Your laptop might not have the option but on some you can configure it to shut down with loss of power connection and boot when it is re-aplied. Someone else can probably provide more info, I don't have a laptop so I can't experiment to see if I can find out how to do it. Hope it gives you ideas to figure it out.
    Josh Karger
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  3. #3
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    I'm using an olf CTX EzBook 750

    It's a Pentium 150 (no mmx)

    The BIOS offers very limited power management options and this doesn't seem to be one fo them. In addition, I'm using Linux as the OS which is working wonderfully, but I don't think 'apmd' is capable of doing this either.

    If I can't rig it through the hardware, is there a way to power a laptop through a peripheral device? I know some desktops can be powered on from a keyboard button. Any thoughts?

  4. #4
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    Well I was reading your first post a little quick and didn't realize you said you didn't have a working batt. In that case, I am assuming that since you have to push it everytime it is a momentary contact button, I would try to cut the leads going to the switch and find another switch that you can actually turn on or off. But I don't know if this would affect your computer in a negative way. Will some else please respond and double check this theory to make sure it will work because I don't have enough knowledge on doing this and what effects it might have on the laptops PS.

    Hope it works out though or someone else knows what to do.

    If worse comes to worse you can always buy some wire and run it to a convenient switch location than disconnect the switch and reconnect all the necessary wiring. that way you wouldn't have to reach to whereever your laptop is. You may find this option more appealing anyway incase it locks up for any reason you can reset it.
    Josh Karger
    By reading this post you agree to overlook all grammatical, spelling, and typographical errors! ;)

  5. #5
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    Hmmm, that's a thought. But I'm worried about the complexity of such a procedure due to the fact that the button operates in a similar fashion to an atx-based computer. The same button powers on the machine, and a single touch can signal it to shut down while holding it down will kill the power.

    If worse comes to worse, I'll mount the thing upside down to the bottom of the driver's seat towards the front, so all I have to do is reach underneath and push the button, although I'd really rather not if I can help it.

    I would like to "move" the button, with all its functions, to somewhere on the dash. Any thoughts on how I could accomplish this?

    BTW, if it helps, I can try to post some pictures of the circuitry w/ the button. Thanks!

  6. #6
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    I believe that's what Caffine addict was suggesting. It should be as simple as cutting the leads to the button and extending the wires and removing the existing switch if you wanted, or you could use any normally open momentary switch. Also, if you wanted to retain the function of the original switch, you could simply splice in a second switch, and use either to power on/off the machine.
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  7. #7
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    We have a P120 laptop here at work that has a bad on-off switch an when we took it in to get it serviced they wanted to charge us $700 to replace the entire motherboard because the switch is part of the motherboard. I've looked at the laptop and I don't know if I couuld put a new switch on there but maybe someone with better soldering skills could....

    I'm just saying that it may be a little complicated to add a new switch and it probably will disable the existing switch.
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  8. #8
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    Yeah that's what I am trying to say... sometimes it's just hard to put it into words. A picture is worth 1,000 words:

    (Just splice into it and make sure the connections are solid and matched right).

    If the switch is part of the mobo you can probably still (carefully) remove it and solder from the leads.

    Hope this helps:
    Josh Karger
    By reading this post you agree to overlook all grammatical, spelling, and typographical errors! ;)

  9. #9
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    Problem solved, and no soldering required!

    I found out that if the button is always held down, the machine will automatically power up when it receives electrical current and will stay that way. Basically, I just have to figure out how to keep the button down and I'm golden... ;-)

    Now to figure out how to power my LCD...

    ...while I;ve got your attention, do parallel LCD's require external power or do they draw it right from the parallel port?

  10. #10
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    After my beautiful drawings too

    Well that's good, replacing it with another switch like I said before (on/off) would work well. But of course you can probably just shove something in between the case and switch if need be or if you want always on... connect the switch's leads together.

    You mean a Char LCD right? It needs its own power, but you can run it through the parallel connector. Mine needs 5v, i think it's easier just to run another wire for the 5v but some people will wire an unused pin in the parallel connector to 5v and just run that. If you have an extra power connector its easy to just run a wire from the 5v on that to your LCD. (Make sure which voltage you need, it might not be 5 volt, but most are)
    Josh Karger
    By reading this post you agree to overlook all grammatical, spelling, and typographical errors! ;)

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