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IBM T23 - will not bot, fan spins fast and slow

Discussion in 'IBM Thinkpad' started by basscleff, Apr 12, 2006.

  1. basscleff

    basscleff Guest

    I bought a T23 that was mis-advertised to boot 1 of 5 attempts.
    It has not booted since I bought it. The problem is that the power
    light comes on, but the fan spins fast and slow continuously.

    I have:
    - removed all extra peripherals, only leaving 1 stick of known working
    - swapped cmos battery with a good one
    - powered unit without a battery installed
    - completely disassembled unit to inspect motherboard for loose parts,
    cold solder joints, visible signs of dameged or blown parts

    Anyone have any experience with this problem, or possibly a method to
    repair it, or where to look for the source of the problem?

    Or, anyone have a replacement motherboad for sale for a reasonable
    price (ebay is very expensive as we all know)

    basscleff, Apr 12, 2006
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  2. basscleff

    Tony Hwang Guest

    Before booting, can you go into BIOS?
    Tony Hwang, Apr 13, 2006
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  3. basscleff

    Gary L. Guest

    I had similar symptoms with my T42 that was caused by a defective fan
    module (replaced under warranty). The BIOS won't let the system boot
    with a bad fan to protect the CPU and to avoid corrupted data. I also
    saw a BIOS error message.

    I'd suggest replacing the fan module before replacing the motherboard.

    - -
    Gary L.
    Reply to the newsgroup only
    Gary L., Apr 22, 2006
  4. basscleff

    steltzy Guest

    I have the same problem with my T23, and in fact so do two of my
    roommates with the exact same T23 (we all were issued the same exact
    laptops). They are about 4 years old, and all failed within 3 months
    of each other with the racing/slow fan behavior. Suspicious.

    Regardless, I believe the problem is either the fan (as was suggested
    already) or the temperature sensor, but I'm not sure yet. There's also
    talk of a certain component coming off of the motherboard on other
    forums, so it might be worth poking around to see if you have a
    component loose. It looks like a magnet with a band wrapped around it
    - I'm not sure what it is, could be an inductor for power conditioning
    or some type of temp sensor.

    My roommate has a fan on order from IBM, we're going to try that first
    because it's the easiest thing to replace. I'll try to repost once we
    get this straightened out.
    steltzy, Apr 27, 2006
  5. basscleff

    steltzy Guest

    The followup - both my computer and my roommates are now fully fixed.
    The problem with both of ours was identical - a component loose on the
    motherboard. Mine had a bad connection though it did not appear loose
    - his fell off when he removed his motherboard from the case.

    The component is on the bottom side of the motherboard (you have to
    remove the motherboard completely to access it), and is a fairly large
    component. Some pictures of the component and where it goes on the
    motherboard can be found here:


    Even if the component is on the board, pry at it to make sure it's
    secure. Mine felt secure but when I torqued on it a bit it was clear
    that one solder joint was bad.

    And that's it, just resecure it with solder and it worked on both of
    our T23s with this symptom!
    steltzy, Apr 29, 2006
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