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Laptop won't turn on

Discussion in 'Electronic Repair' started by Peter Allen, Dec 6, 2004.

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  1. Peter Allen

    Peter Allen Guest

    Hi

    I have a Toshiba Satellite 1000 laptop which was plugged into the wall
    (battery-in) all day yesterday which has been its usual behaviour for
    the past few months. I restarted it thru Windows XP's shutdown menu,
    left the room to get a drink, and upon my return it was off.

    Since then I've not been able to turn it on. No LEDs on the laptop
    itself ever come on, although they do flash very quickly (you really
    have to look to see it) when I plug the power cord into the laptop.

    I've tried taking the battery out and plugging the laptop into the
    wall, holding the button down for ages, etc. It's not simply
    hibernating/asleep.

    It uses a 3.16A 19V DC power supply, the strangest thing i've noticed
    is when the power adapter is plugged into the laptop, from that same
    area on the laptop i can hear a quiet high pitched fluttering sound,
    like a little bird is in there. Also, there's an LED on the power
    brick which is on while the brick is plugged into the wall but turns
    off once the other end is plugged into the laptop -- I'm not sure if
    that's normal. Also, I've never plugged the wrong power brick into it,
    so that's not the problem.

    I'd basically like to know what I should try with this laptop, as it's
    out of warranty and I'm probably going to have to fix it myself. To me
    it doesn't sound like it's the power brick that needs replacing, it
    sounds more like an internal component, or (hopefully) a fuse
    somewhere?

    but then again I wouldn't be posting here if I knew what I was talking
    about :)

    If anyone can point me in the right direction, I'd be extremely
    appreciative.

    --Pete
     
  2. Harr Lee

    Harr Lee Guest

    Did you measure the voltage from the power brick both with it plugged into
    the laptop and with it unplugged from the laptop? I would think that the led
    on the power brick should be on anytime it is plugged into the wall.

    Harr
     
  3. Peter Allen

    Peter Allen Guest

    Hi Harr, Thanks for your reply

    I didn't do that, however what I did do was purchase a new power brick
    and tried powering up with that, to no avail.

    I'm guessing it must be something inside the laptop.

    Can you give me any ideas as to what to look for?

    I'm really puzzled as to what has caused this, as there were other
    devices plugged into the same power strip which are fine, and the brick
    itself was not damaged.
    Any advice would be awesome, thanks again

    --Pete
     
  4. Peter Allen

    Peter Allen Guest

    Hi Harr, Thanks for your reply

    I didn't do that, however what I did do was purchase a new power brick
    and tried powering up with that, to no avail.

    I'm guessing it must be something inside the laptop.

    Can you give me any ideas as to what to look for?

    I'm really puzzled as to what has caused this, as there were other
    devices plugged into the same power strip which are fine, and the brick
    itself was not damaged.
    Any advice would be awesome, thanks again

    --Pete
     
  5. James Sweet

    James Sweet Guest

    Things do fail sometimes, you could look in the laptop, though unless you
    have a multimeter, soldering equipment, and the skills to use them to
    diagnose the charging circuit and power supply, you're probably out of luck.
     
  6. Winston

    Winston Guest

    Toshiba support: http://www.csd.toshiba.com/cgi-bin/tais/su/su_askIris.jsp says:

    This document offers a general list of things you can do if your Toshiba Portable PC won't turn on
    when you press the power button.

    * Make sure the battery has a full charge.
    * Try plugging the AC adaptor into the computer.
    * Try plugging the AC adaptor into a different outlet.
    * Try pressing the power switch for ten seconds.
    * Make sure the power switch is not physically locked off, like a cover protecting it.
    * Try removing the battery and the AC adaptor, then plug only the AC adaptor in and try
    powering on.
    * Make sure you have the proper AC adaptor, and only use the one that shipped with the computer.
    * Look at the lights on the computer for clues. Are you getting AC power? Is a light blinking?
    Check the manual or look for another technote if you have a blinking light.
    * Is the computer turning on, but the display is blank or being routed to a monitor that you
    can't see? If so, try using the Fn+F5 keys.
    * If the computer is on, but no display or won't power off, you can press and hold the power
    button for ten seconds (until it powers off), then try powering on again.
    * Make sure you remove all extra hard ware, especially extra memory even if it shipped that way
    from the dealer. The memory could be loose, or could have gone bad.

    --Winston
     
  7. James Sweet

    James Sweet Guest

    That sounds like a list of things their phone tech support would tell you.
    Something is obviously shorted in the power supply in the computer, since
    the adapter shuts down when plugged into it.
     
  8. hemyd

    hemyd Guest

    I am not familliar with Toshibas, but the laptops I know have a small backup
    or BIOS battery. If there is one on yourToshiba and it is easily accessible,
    remove it, leave it out for a while with no main battery and no charger
    connected, then turn it on again. The remaining possibility is that the hard
    disk is defective. Try taking it out (normally quite easy for the common
    user), then try turning the laptop on without it. If it works, then it is a
    defective hard disk. If after removing the backup battery and the hard disk
    it still doesn't boot, then unfortunately it will be an expensive system
    board fault. Unless you have some experience and equipment to fix those, I
    am afraid you haven't got a hope of getting it going...

    Henry.
     
  9. The power brick has most likely developed a fault. These devices are rarely
    made by the laptop manufacturers and are often bough in bulk from places
    like China. These supplies are very sensitive to capacitor failures, and it
    sounds like this is what has happened to yours (the LED going out when
    connected to the laptop is the clue). Is it possible to try the laptop with
    another brick? 19 volts is fairly standard, but do check. The connector
    may differ though.

    A cheap third party unit should be relatively easy to obtain. Alternatively
    you may prefer to go with the vastly more expensive Toshiba part, but it
    won't be any better.

    Ian.
     
  10. ILAH

    ILAH Guest

    Hi Allan,

    The problem that I understand so far, is some how related to your CEMOS
    battery. As I know one of my friend got the same problem and he fix it
    with buying new CEMOS battery. So you should try through this way maybe
    it brings good outcome.

    Good Day.
     
  11. Guest

    ROFL @ CEMOS!!! Sorry, I just got a good laugh out of that.

    But seriously, your problem has nothing to do with your AC adaptor, or
    your hard drive, or your _CMOS_ battery. Sounds like you blew a
    component onboard inside the laptop. Most likely a capacitor or
    transistor. I've heard even the smallest caps and transistors make
    sounds similar to a bird, as you described, after being blown. Get
    yourself a good multimeter and the schematics for the laptop and get
    busy. Actually, you might be able to figure out what blew visually,
    look for anything that was burnt. It is most likely more trouble than
    it's worth to fix though. Good luck.

    _________________
    Beeeeeyotch!

    Get a free 2.8GHz laptop
    http://www.pctech4free.com/default.aspx?ref=5296
     
  12. Guest

    ROFL @ CEMOS!!! Sorry, I just got a good laugh out of that.

    But seriously, your problem has nothing to do with your AC adaptor, or
    your hard drive, or your _CMOS_ battery. Sounds like you blew a
    component onboard inside the laptop. Most likely a capacitor or
    transistor. I've heard even the smallest caps and transistors make
    sounds similar to a bird, as you described, after being blown. Get
    yourself a good multimeter and the schematics for the laptop and get
    busy. Actually, you might be able to figure out what blew visually,
    look for anything that was burnt. It is most likely more trouble than
    it's worth to fix though. Good luck.

    _________________
    Beeeeeyotch!

    Get a free 2.8GHz laptop
    http://www.pctech4free.com/default.aspx?ref=5296
     
  13. James Sweet

    James Sweet Guest

    He said he already tried a new adapter so that's obviously not the problem,
    and the laptop is clearly overloading the adapter causing it to shut down so
    the problem is obviously not related to the cmos either. This is clearly a
    case of a shorted component in the power supply, the chirping is from one of
    the inductors as the unit repeatedly tries to power up but detects the short
    and shuts down.
     
  14. Peter Allen

    Peter Allen Guest

    Thanks very much for your replies everyone!

    I have pulled the laptop apart however nothing looks or smells burnt.

    James: Is the kind of fault you're talking about an easy fix for an
    electronics repair tradesperson? I fear a new power supply from
    Toshiba will cost more than I'm prepared to spend on a 3yr old laptop.
    A bit of a shame since it's still perfect for my needs, but what can
    you do!

    Again, thanks to all for your time and help :)

    --Pete.
     
  15. James Sweet

    James Sweet Guest


    Well in theory yes, though we're talking about a laptop here and sometimes
    just getting to the board in question can be a chore and then you're dealing
    with tiny surface mount components. I'd say this particular problem should
    be repairable though.
     
  16. Mike Kennedy

    Mike Kennedy Guest

    If it were me I'd just sell it on ebay or buy one with a broken screen on
    ebay and swap parts out...
     
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