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Dell Laptop component level repair

Discussion in 'Electronic Repair' started by Mike S, Apr 7, 2008.

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  1. Mike S

    Mike S Guest

    Does anyone have component level repair experience on laptops?
    I've got a Dell Inspiron 8500 notebook computer with a charging problem-
    The computer will run fine from the batteries until they are dead.
    When plugged into the AC adapter, the BIOS gives an error message stating
    that it cannot recognize the AC adapter, but it will power the computer. It
    will not charge the batteries with the AC adapter.
    The AC adapter has been confirmed good in two ways: the AC adapter powers
    another identical computer with no problem, and another adapter gives the
    same symptom.
    When I plug the AC adapter into a Port Replicator and the computer onto the
    port replicator, the batteries will charge.
    The adapter input jack on the motherboard has been replaced, and I've
    inspected the board as well as possible for a bad connection or faulty
    components, but without a schematic of the power/charging circuit it's
    nearly impossible to search for a fault.
    The obvious solution is to replace the motherboard - again (this is my third
    mobo in 5 years). I don't wish to invest another $160 in parts for another
    temporary repair on this flawed design.
    Does anyone have a schematic (longshot) or experience on repairing this
    mobo?
     
  2. Jim Yanik

    Jim Yanik Guest

    I suppose you could note down all the ICs in the area of the jack and
    locate their spec sheets and find the one that regulates the battery
    charging.
    The spec sheets usually have application notes with typical circuit
    diagrams.
     
  3. jakdedert

    jakdedert Guest

    I'm guessing that the DC input jack repair was less than successful.

    I think it's likely that one or more layers of the pc board are not
    connected to the replaced jack. The charging circuitry appears to be
    good, since the battery charges in the docking bay. I'd be surprised if
    there was duplicate circuitry to recharge from that source, only a
    different connection to the same part of the circuit that gets power
    from the input jack.

    Resoldering the DC jack might get it working again.

    jak
     
  4. Mike S

    Mike S Guest


    Thank you all for your replies.
    The other motherboards suffered different failutres (bad design) so I have
    several full sets of power supply components to work with.
    I don't think the problem is related to use of the port replicator because I
    just started using it to charge the notebook now. Never used it with the
    previous motherboards. The pinout of the adapter is helpful.
     
  5. bz

    bz Guest

    .....
    Build a dam around the component with paper. You can use a hot air gun to
    remove or solder just one component, if you do things right.








    --
    bz 73 de N5BZ k

    please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
    infinite set.

    remove ch100-5 to avoid spam trap
     
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