PowerBook 145B power issues

Discussion in 'PowerPC Macs' started by 128keaton, Jul 5, 2016.

  1. 128keaton macrumors 68020

    128keaton

    Joined:
    Jan 13, 2013
    #1
    I received a Powerbook 145B in 'ok' shape, but I cannot get it to turn on. I'm using an aftermarket charger, but whenever I plug the charger in, the light on the charger fades out. I'm thinking there is a short somewhere, but I cannot locate it. However, I've seen two sources:
    https://www.amazon.com/PowerBook-145-Compatible-Adapter-Charger/dp/B004MM8EZ0
    that one states that 24V is the norm, but I've heard 7v too?
     
  2. MikeatOSX, Jul 5, 2016
    Last edited: Jul 5, 2016

    MikeatOSX macrumors regular

    MikeatOSX

    Joined:
    Mar 26, 2007
    Location:
    Austria
    #2
    PowerBook 145B power supply is 7.5 volts, 2.0 ampere.
    With 24 volts you can kill it.
    If it doesn't start with a good adapter, remove the battery first, because an old battery often has a short.
    If it doesn't start without battery, reset the power manager.
    http://tim.id.au/laptops/apple/powerbook/powerbook_140.145.b.170.pdf

    page 146, 134
     
  3. havokalien macrumors 6502a

    havokalien

    Joined:
    Apr 27, 2006
    Location:
    Kelso, Wa
    #3
    The power supplies on these are dying. You may need to pop it apart and replace capacitors. Over at 68kmla we have talked about these a bunch. At wal mart they have a universal power adapter than can do 7.5 volts at 2 amp with a correct fitting. That way you have a new power supply, for about 20 dollars and the fact you can just take it back its a win win to try.
    --- Post Merged, Jul 5, 2016 ---
    Oh and just like the centris 650 person, even tho this says powerbook, its a 68k processor not a powerpc. You may get better and faster ideas from the Apple collector section.
     
  4. 128keaton thread starter macrumors 68020

    128keaton

    Joined:
    Jan 13, 2013
    #4
    Ok, I'll take a look at this. The nearest wall mart is a bit aways, but I'll see. I tried registering on 68kMLA, but I didn't get a confirmation email :/
     
  5. MikeatOSX macrumors regular

    MikeatOSX

    Joined:
    Mar 26, 2007
    Location:
    Austria
    #5
  6. ExcelTronic macrumors newbie

    ExcelTronic

    Joined:
    Dec 31, 2015
    Location:
    Chicago
    #6
    The PowerBook 145B uses a 7.5V 2A Power Plug. I was fortunate enough to buy a plug (Enercell 273-333) at Radio Shack a few years ago.

    The link MikeatOSX posted for ebay will also work.
     
  7. 128keaton thread starter macrumors 68020

    128keaton

    Joined:
    Jan 13, 2013
    #7
    Do you guys think a 7.5v 1A Power Supply will work? I found one, a Netgear wallwart
     
  8. ExcelTronic macrumors newbie

    ExcelTronic

    Joined:
    Dec 31, 2015
    Location:
    Chicago
    #8
    it could work, but it isn't recommended at all. It would be best used to test if it works, but that's it. It really depends on the amount of electricity is needed from the computer, and that varies depending on the task. So, booting it up should be fine, but continuous use isn't recommended. It would be best to buy the correct power adapter on eBay.
     
  9. MikeatOSX macrumors regular

    MikeatOSX

    Joined:
    Mar 26, 2007
    Location:
    Austria
    #9
    Maybe a weak power supply can't load the battery, while the PowerBook is on.
    BTW:
    This is the reason, that my 3 PowerBooks 180c (color consumes more power) can be booted by a 2.0 ampere power supply only, when the battery is removed before.
    When I boot them by the original 3.0 ampere power supply or by a 3.5 ampere replacement power supply, the battery is loaded without problems.
     
  10. 128keaton thread starter macrumors 68020

    128keaton

    Joined:
    Jan 13, 2013
    #10
    Ok, I've sourced the original Power supply to the machine. 45W gray brick :)
     
  11. MikeatOSX macrumors regular

    MikeatOSX

    Joined:
    Mar 26, 2007
    Location:
    Austria
  12. 128keaton thread starter macrumors 68020

    128keaton

    Joined:
    Jan 13, 2013
    #12
    Yup..correct :(
     

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