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IBM Thinkpad with a broken LAN connector. Any help?

Discussion in 'Electronic Repair' started by [email protected], May 22, 2007.

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  1. Guest

    I could take home a pc from work. It's a Thinkpad with a 1,7 Pentium
    CPU. It works very well except for a quite frustrating problem. Its
    lan connector can't mantain a stable connection. As soon as a lan
    cable is plugged into it it start to continuously getting ON and OFF
    the network. This happens with Windows XP, but it also happens using a
    Linuc livecd, and with different lan cables, so I guess it's a
    hardware related problem.

    Do you happen to know if this is easily fixable or what may cause it?

    Thanks a million in advance.
     
  2. Meat Plow

    Meat Plow Guest

    Just buy a pcmcia or usb ethernet connector and forget about the built in
    lan.

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  3. JANA

    JANA Guest

    It's fixable. You will have to take the computer apart, and see if there are
    any cold solder connections. You will need the proper soldering tools, and
    skills to re-solder the connector pins at the circuit board.

    If the connector itself is defective, many of these are standard PC mount
    type connectors. You will have to match it up to a proper part number using
    the connector listings in the proper catalogue. There are many electronics
    parts suppliers that can supply these connectors. You may have to buy a
    minimum size order to buy the connector.

    To change the connector, you will still require the proper soldering tools
    and skills. Removing the old connector without damaging the board is a task
    in itself.

    Your best bet would be to bring the computer to a service centre that is
    able to change these types of parts and service computers. The greatest cost
    will be for the labour.

    If you don't want to fix the connector problem, if the computer has a PCM
    slot for external options, you can buy a PCM type network card, and install
    it as your Ethernet connection. I have seen these PCM Ethernet cards going
    for about $40 to $70 US depending on the type and quality.

    There are also USB-2 to Ethernet adaptors. I found that these are not
    always the best solution. They tend to have speed problems at times and
    sometimes other issues, but usually they do work.

    --

    JANA
    _____


    I could take home a pc from work. It's a Thinkpad with a 1,7 Pentium
    CPU. It works very well except for a quite frustrating problem. Its
    lan connector can't mantain a stable connection. As soon as a lan
    cable is plugged into it it start to continuously getting ON and OFF
    the network. This happens with Windows XP, but it also happens using a
    Linuc livecd, and with different lan cables, so I guess it's a
    hardware related problem.

    Do you happen to know if this is easily fixable or what may cause it?

    Thanks a million in advance.
     
  4. mike

    mike Guest

    First thing I'd do is take a peek inside the socket. make sure the
    wires that form the connection are not bent and can make firm
    contact with the right part of the plug. Sometimes people try to plug
    the phone wire in there and bend things. Not sure how the pins line up,
    but the 50V on the phone wire is not ethernet friendly...

    Then, I'd take a Q-tip and some alcohol to try to clean off any gunk
    in there.

    Then I'd put an oscilloscope on a tap at the other end of the wire
    and see if anything interesting shows up.

    It's always possible, but if you don't touch anything and it's going
    on and off, it may not be the connection. Putting pressure in one
    direction or another may or may not make the problem better or worse,
    but it's an experiment worth trying.
     
  5. bz

    bz Guest

    Fixable.
    Buy a USB-ethernet adapter and plug it into the USB port.
    Disable the on-board ethernet device.
    Or buy a PCmcia card ethernet adapter.

    If your computer doesn't have USB or PCMCIA capability, it is too old to be
    useful for most purposes.

    Alternately, replace the mother board.







    --
    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
     
  6. Guest

    Thanks everybody for the replies :)
    I'll let you know if I could fix it (or have it fixed... ;)
     
  7. Rick

    Rick Guest

    Not knowing with series and model IBM this is all I can tell you is to
    get that info off the bottom, go to the IBM web site, and download the
    Hardware Reference Manual (HRM) for this specific lap top.

    If you think the LAN socket itself has developed a problem:

    If this is an IBM that uses a mini PCI combo card that contains the LAN
    and/or modem on that card, chances are the sockets for the modem and LAN
    are connected to the mini PCI card with a ribbon cable. If that's the
    case those are the only two sockets on the back of the lap top which are
    removeable and you are in luck. Replace the cable/socket assembly. But
    also be prepared to do a full disassembly of the lap top - that cable
    runs underneath the main board and is held in place with double sided
    foam tape.

    If the LAN connector looks ok:

    Check the HRM for removal/insertion instructions for the mini PCI card
    and reseat it to see if that corrects the problem.

    But before you do any of that run the IBM PC Doctor disgnostics to see
    what it has to say about the LAN hardware in this system. It should be
    on the system already. If not, download it from IBM.

    Rick
     
  8. isw

    isw Guest

    First thing I'd do is take a peek inside the socket. make sure the
    wires that form the connection are not bent and can make firm
    contact with the right part of the plug. Sometimes people try to plug
    the phone wire in there and bend things.[/QUOTE]

    The 8-pin jack is specifically designed so that the 4-pin plug can be
    inserted; it's intended for that. The middle 4 connections will go
    through.

    Isaac
     
  9. bz

    bz Guest

    The 8-pin jack is specifically designed so that the 4-pin plug can be
    inserted; it's intended for that. The middle 4 connections will go
    through.[/QUOTE]

    Yep, but a phone cord doesn't *work* worth a darn in place of a cat-5
    cable.

    I was called to check the ethernet drop in a room because they couldn't get
    a link light. I had to explain to them that the telephone extension cord
    they were trying to use was NOT an ethernet cord. :)




    --
    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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