Results 1 to 3 of 3

Thread: Thinkpad X31 - Won't boot unless plugged into the mains...

  1. #1
    cat /dev/null streetster's Avatar
    Join Date
    Jul 2003
    Location
    London
    Posts
    4,138
    Thanks
    119
    Thanked
    100 times in 82 posts
    • streetster's system
      • Motherboard:
      • Asus P7P55D-E
      • CPU:
      • Intel i5 750 2.67 @ 4.0Ghz
      • Memory:
      • 4GB Corsair XMS DDR3
      • Storage:
      • 2x1TB Drives [RAID0]
      • Graphics card(s):
      • 2xSapphire HD 4870 512MB CrossFireX
      • PSU:
      • Corsair HX520W
      • Case:
      • Coolermaster Black Widow
      • Operating System:
      • Windows 7 x64
      • Monitor(s):
      • DELL U2311
      • Internet:
      • Virgin 50Mb

    Thinkpad X31 - Won't boot unless plugged into the mains...

    Hey Guys,

    I've got an odd situation with an X31 laptop i've just picked up...

    If it's not plugged into the mains, the 'on' button has no effect - the laptop is stone dead... plug into mains, turn on, everything perfect.

    So i tried a different battery (from an X30, but still compatible), and the same problem occurs, the laptop seems to be completely dead, but if you plug it into a/c it boots perfectly...


    I've had a quick google but not turned up anything, i've tried clearing cmos/etc to no avail... just wondered if anyone had any ideas, or had a similar experience (and hopefully solution!)



    Right.. so once it's turned on (ie POST'd) you can unplug the a/c supply and it works fine... why?!
    Last edited by streetster; 27-10-2007 at 04:47 PM.

  2. #2
    Admin team peterb's Avatar
    Join Date
    Aug 2005
    Location
    Southampton
    Posts
    19,378
    Thanks
    2,892
    Thanked
    3,401 times in 2,691 posts
    • peterb's system
      • Motherboard:
      • Nascom 2
      • CPU:
      • Z80B
      • Memory:
      • 48K 8 bit memory on separate card
      • Storage:
      • Audio cassette tape - home built 5.25" floppy drive
      • Graphics card(s):
      • text output (composite video)
      • PSU:
      • Home built
      • Case:
      • Home built
      • Operating System:
      • Nas-sys
      • Monitor(s):
      • 12" monocrome composite video input
      • Internet:
      • No networking capability on this machine

    Re: Thinkpad X31 - Won't boot unless plugged into the mains...

    I am assuning that the battery you are testing it with is a good one that has full voltage on the output and is a fully compatible version.. If not then that would be the first thing to check.

    If that is so (and this is only a theory) possibly an internal power supply problem with the battery monitoring and charging area. The on/off switch is a 'soft' switch so if there is a problem with the circuitry associated with the battery, it could prevent it from poering up. Plugging in the mains adaptor circumvents that aspect of the start up - but once started the battery will run it successfully.

    If that is the case, I'm not sure that there is much you can do to fix it.
    (\__/)
    (='.'=)
    (")_(")

    Been helped or just 'Like' a post? Use the Thanks button!
    My broadband speed - 750 Meganibbles/minute

  3. #3
    cat /dev/null streetster's Avatar
    Join Date
    Jul 2003
    Location
    London
    Posts
    4,138
    Thanks
    119
    Thanked
    100 times in 82 posts
    • streetster's system
      • Motherboard:
      • Asus P7P55D-E
      • CPU:
      • Intel i5 750 2.67 @ 4.0Ghz
      • Memory:
      • 4GB Corsair XMS DDR3
      • Storage:
      • 2x1TB Drives [RAID0]
      • Graphics card(s):
      • 2xSapphire HD 4870 512MB CrossFireX
      • PSU:
      • Corsair HX520W
      • Case:
      • Coolermaster Black Widow
      • Operating System:
      • Windows 7 x64
      • Monitor(s):
      • DELL U2311
      • Internet:
      • Virgin 50Mb

    Re: Thinkpad X31 - Won't boot unless plugged into the mains...

    Quote Originally Posted by peterb View Post
    I am assuning that the battery you are testing it with is a good one that has full voltage on the output and is a fully compatible version.. If not then that would be the first thing to check.
    The X30/X31/X32 laptops all share the same common battery... my X31 battery worked perfectly in the X30 i tried it in...

    Quote Originally Posted by peterb View Post
    If that is so (and this is only a theory) possibly an internal power supply problem with the battery monitoring and charging area. The on/off switch is a 'soft' switch so if there is a problem with the circuitry associated with the battery, it could prevent it from poering up. Plugging in the mains adaptor circumvents that aspect of the start up - but once started the battery will run it successfully.

    If that is the case, I'm not sure that there is much you can do to fix it.
    doesn't sound so hopeful may have a fiddle about inside if i can, see if anything is damaged/amiss...

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Windows - boot process & simple troubleshooting
    By Paul Adams in forum Software
    Replies: 30
    Last Post: 17-11-2010, 04:38 AM
  2. Windows - a brief guide inside
    By Paul Adams in forum Software
    Replies: 31
    Last Post: 23-06-2007, 03:14 PM
  3. PC won't boot up with 2 monitors plugged in
    By latrosicarius in forum PC Hardware and Components
    Replies: 15
    Last Post: 04-12-2006, 05:21 AM
  4. Power LED flashes when pc gets plugged into mains
    By YorkieBen in forum Help! Quick Relief From Tech Headaches
    Replies: 3
    Last Post: 18-01-2006, 11:53 AM

Posting Permissions

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