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Thread: Help repairing IBM PS/2 L40 SX docking station

  1. #1

    Question Help repairing IBM PS/2 L40 SX docking station

    I have a docking station (PSP I (Portable Service Platform)) for an IBM PS/2 L40 SX that Iím trying to restore. When powering it on the laptop gets power, but the docking station itself doesnít. I thought the issue was with the power supply (there are two, one for the laptop voltage, and one for the docking station), so I rebuilt the PSU for the docking station, but the docking station still doesnít get power. I found a replacement power supply for cheap so I picked that up, but thereís no change. Realizing I have another issue, I started probing the docking station and realized that there is a problem on the board as the power supply isn't putting out the proper voltage when the power supply is connected to the board, but the power supply puts out the proper voltage with it's not connected.

    There arenít a lot of components on the board, but I do see 8 tantalum capacitors, and I wonder if they could be the problem. I canít find replacements for these: 6 are marked 5615 372 9045 (4 pins, -++-), 1 is 89453, and 1 is 9422. Can anyone point me in the right direction for an alternative part?

    Once I find them the next hurdle will be installing them, this doesnít look to be an easily serviceable part!

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  2. #2
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    First sanity check is seeing if any of the tantalums are shorted. They don't always go bang with low current power sources. I had an Apple IIe memory card that would kill the IIe until I pulled about half a dozen tants off the board and the 5v short to ground went away.

  3. #3

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    Quote Originally Posted by NeXT View Post
    First sanity check is seeing if any of the tantalums are shorted. They don't always go bang with low current power sources. I had an Apple IIe memory card that would kill the IIe until I pulled about half a dozen tants off the board and the 5v short to ground went away.
    It seems like only one of them has a short. The bigger issue is what to replace it with. I can't find any information on these tantalum capacitors.

  4. #4

    Default IBM 5615372 tantalum capacitors

    Quote Originally Posted by markgm View Post
    It seems like only one of them has a short. The bigger issue is what to replace it with. I can't find any information on these tantalum capacitors.
    Did you ever get this solved? I have a bag of 5615372 tantalum caps (4 lead) from IBM.IMG_4152.jpg

  5. #5

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    Hi, I removed the offending capacitor and the docking station came to life, though I'd feel better replacing it since I assume it was put there for a reason!

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