Results 1 to 9 of 9

Thread: Laptop Power Switch Question HELP!!

  1. #1
    Maximum Bitrate Altimat's Avatar
    Join Date
    Oct 2003
    Location
    WI
    Posts
    764

    Laptop Power Switch Question HELP!!

    I disassembled my laptop enough to discover that the power switch is a double pole, 6 terminal switch with 6 contacts (2 each NO, common, and NC - verified with a meter). I can't tell which of these actually have traces going to them. Now I suspect that this switch was used simply because the 6 terminals soldered through the mobo provided secure mounting and simple manufacturing, and that one set of the NO contacts is all that is actually being used to turn the mobo on/off. Dare I simply pick on of those two contacts and momentarily short them to see if it switches on/off? (Obviously I can program this switch for startup/shutdown, standby, or hibernate) If the first pair didn't work I'd try the second. Or is the risk of causing permanent damage too great? Opinions please!

    Of course all I want to do is install a 2 terminal connector into the case of the laptop so that Ican plug in the switch wires from my ITPS.

    Thanks,
    Mike
    Fabricator

  2. #2
    Constant Bitrate
    Join Date
    Apr 2003
    Posts
    189
    I wired an external switch to my laptop as well. It's unlikely that you will harm the notebook if you take a short piece of wire and short the Common and NO terminals. After all, this is what the switch does when you press it ! If the laptop doesn't turn on, try shorting the Common and NO terminals of the other pole.

  3. #3
    Constant Bitrate
    Join Date
    Nov 2001
    Location
    NYC
    Posts
    175
    Quote Originally Posted by Altimat
    I disassembled my laptop enough to discover that the power switch is a double pole, 6 terminal switch with 6 contacts (2 each NO, common, and NC - verified with a meter). I can't tell which of these actually have traces going to them. Now I suspect that this switch was used simply because the 6 terminals soldered through the mobo provided secure mounting and simple manufacturing, and that one set of the NO contacts is all that is actually being used to turn the mobo on/off. Dare I simply pick on of those two contacts and momentarily short them to see if it switches on/off? (Obviously I can program this switch for startup/shutdown, standby, or hibernate) If the first pair didn't work I'd try the second. Or is the risk of causing permanent damage too great? Opinions please!

    Of course all I want to do is install a 2 terminal connector into the case of the laptop so that Ican plug in the switch wires from my ITPS.

    Thanks,
    Mike

    I have a dell laptop and also had 6 soldered points, but i don't know what external switch to use. Can you show me what switch your using? And what powered usb hub are you using, i'm having a lil trouble with that. Thanks!

  4. #4
    FLAC DodgeCummins's Avatar
    Join Date
    Oct 2000
    Location
    DFW area
    Posts
    1,386
    If you could post a photo of your mobo it would help.

    But if it is pushbutton, then I almost has to be 2 wires...anything else would be really weird.

  5. #5
    FLAC chut's Avatar
    Join Date
    Jul 2003
    Location
    San Antonio, TX. USA
    Posts
    1,375
    I wired my Dell with a single pole single throw momentary contact switch. Works like a charm! I shorted out two contacts on the six contact switch very quickly and got it on the third try. I did no damage to the motherboard that I can tell and the switch is located in my center console. Soldering is easy if you "tin" the wires first. Use single conductor wire rather than braided. It's easier to work with in tightly confined areas. I have since switched over to an actual PC for the car, but the laptop was my original carputer.
    Stop Buying New Music CD's.
    Hit The RIAA where it lives.

    Indash Motorized 7", Epia Nehimiah, 512 MB, 80 GB, DVD, Wireless G, XP Pro, XM PCR, Kenwwod 5 Channel 1200 Watt Amp.

  6. #6
    Maximum Bitrate Altimat's Avatar
    Join Date
    Oct 2003
    Location
    WI
    Posts
    764
    Quote Originally Posted by bankingdom
    I have a dell laptop and also had 6 soldered points, but i don't know what external switch to use. Can you show me what switch your using? And what powered usb hub are you using, i'm having a lil trouble with that. Thanks!
    I am not using any switch. I will be using an ITPS to switch the laptop on and off. The existing switch on the side of the laptop is a momentary slide switch. There is another momentary push button switch under the screen and in the back left corner, but that one is more difficult to access.

    My powered USB hub is a cheapie from Ebay. It works well.

    If you have a similar setup, remove the battery and use a continuity tester to determine which contacts are the normally closed side. The other pair will be the normally open side, and shorting one of these to the corresponding common center terminal should power up the laptop. I guess I'll try it now!
    Fabricator

  7. #7
    Maximum Bitrate Altimat's Avatar
    Join Date
    Oct 2003
    Location
    WI
    Posts
    764
    IT WORKS!!! Thanks for helping me overcome my fears Chut. I lucked out and got it first try. Tomorrow I make the trip to my local hobby shop for a nice little 2 pin Deans connector. I'll permanently install the female flush into the laptop case, and the male will plug right in. FYI (for those of you that aren't R/C freaks) Nice little 2-3 pin connectors available at your local hobby shop, as well as nice 3 conductor miniature ribbon cables normally used for R/C servos etc. that work great for extending wires to optics or switches. Plenty of low current loss connectors for big power (30+ amps!) too.
    Fabricator

  8. #8
    Maximum Bitrate Altimat's Avatar
    Join Date
    Oct 2003
    Location
    WI
    Posts
    764
    Here are those Deans connectors:


    Here is the wiring job. Wasn't easy. I added some hot melt to keep things secure:


    The finished job:
    Fabricator

  9. #9
    FLAC DodgeCummins's Avatar
    Join Date
    Oct 2000
    Location
    DFW area
    Posts
    1,386
    Sweet!

Similar Threads

  1. linking into laptop power button
    By corsamel in forum General Hardware Discussion
    Replies: 22
    Last Post: 04-23-2010, 05:53 AM
  2. laptop power switch
    By jstrain in forum General Hardware Discussion
    Replies: 5
    Last Post: 07-23-2005, 09:53 PM
  3. Just Cooler RF Remote power switch question
    By swzine in forum Power Supplies
    Replies: 0
    Last Post: 11-23-2003, 03:14 PM
  4. Wanna power this laptop since I fried my system today.
    By MikeHunt79 in forum Power Supplies
    Replies: 6
    Last Post: 07-07-2003, 12:24 PM
  5. ATX power switch
    By mtmsol in forum Power Supplies
    Replies: 5
    Last Post: 05-13-2001, 01:22 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •