PowerBook 1400c small cracks advice

Discussion in 'Apple Collectors' started by MikeatOSX, Oct 30, 2015.

  1. MikeatOSX macrumors regular

    MikeatOSX

    Joined:
    Mar 26, 2007
    Location:
    Austria
    #1
    Hi,
    my PB 1400c got two small cracks near the hinges. It's a well known problem: the hinges are ok, but don't move lissomely any more.
    Maybe they need some oil?

    So I want to disassemble the display and glue some plastics or metal? on the inner side.

    Can somebody please help me with choosing the proper glue? Maybe Cyanacrylate ("Superglue") or something else?
     
  2. MacTech68 macrumors 68000

    MacTech68

    Joined:
    Mar 16, 2008
    Location:
    Australia, Perth
    #2
    It's difficult to recommend anything with laptop hinges. They are a "friction hinge". Lubricating it with oil or WD-40 is NOT RECOMMENDED since this can produce a hinge that will no longer support the force produced by the weight of the display and housing, creating a display that won't stay open.

    A little complicated but the best description I can find is this patent:
    http://www.google.com/patents/US6467129

    There are many suggestions all over the web, and there used to be a company offering "conditioner" for the old Titanium G4 hinges which used to seize up nicely and crack the display housing and laptop base.

    The problem is that due to the contact area between the surfaces inside the hinge being almost inaccessible, getting an appropriate grease in there is near impossible by simple methods. This leads to the temptation to use a thin oil, but this reduces the friction beyond what is required to keep the screen in a balanced open position at a wide range of angles.

    Of course, the cracking of the plastic mounts is most likely the result of the grease hardening or evaporating, which increases the force required to move it.

    If you go ahead with any solution, resist the urge to turn the hinges whilst not mounted in place, as you can apply too much force by hand and break the mounting flanges of the hinge.

    Superglue will often work to repair the plastics. I used to sometimes glue in place with superglue, then surround the cracked area with a two part epoxy to (hopefully) provide extra strength. All the usual cautions apply such as using a minimal amount of superglue (a needle as an applicator can help to allow a measured application), sufficient ventilation to prevent marking, and if you use the additional epoxy, make sure it doesn't interfere with the shape and fit of the hinge flange. Of course, you need to resolve the stiffened hinge or the crack will re-develop.

    You'll end up in a Catch-22 where you need to work the hinge in place to free it up, but you risk breaking the repair to the plastic display housing.

    Difficulty level - 10. ;)

    Good luck!
     
  3. MikeatOSX thread starter macrumors regular

    MikeatOSX

    Joined:
    Mar 26, 2007
    Location:
    Austria
    #3
    Wow, this is an answer with profound knowledge!
    Thank you very much !
     
  4. weckart macrumors 68040

    Joined:
    Nov 7, 2004
    #4
    I had the same problem and tried Superglue. While it bonded, it provided no additional strength to the plastic housing and the stiffening hinge joint did for it before too long. I just bought a spare salvaged display and replaced the screen (salvage was a CS display). Seized hinges are difficult to treat.
     
  5. MikeatOSX thread starter macrumors regular

    MikeatOSX

    Joined:
    Mar 26, 2007
    Location:
    Austria
    #5
    Thanks, I'll see. In case of emergency I have two other PB 1400c. But all three are working PowerBooks. :)
     
  6. weckart macrumors 68040

    Joined:
    Nov 7, 2004
    #6
    You could try eBay or PCHub and see whether you could pick up a spare hinge. Not unknown for those to come up for various models of PowerBook. Dismantling the display lid to fit a new hinge is not too difficult.
     
  7. MikeatOSX thread starter macrumors regular

    MikeatOSX

    Joined:
    Mar 26, 2007
    Location:
    Austria
    #7
    I have hinges in stock and swapped them on four PowerBooks already.
    Thanks!
     

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