Power Mac G5 600W PSU photos

Discussion in 'PowerPC Macs' started by mortar, Feb 23, 2016.

  1. mortar macrumors newbie

    Joined:
    Sep 10, 2014
    #1
    I chanced upon a leaked LCS 2.5 Dual G5 that turned out to be in rather catastrophic condition. The metal parts were corroded beyond recoginition almost. I took it apart regardless and found that the PCB were quite okay. The PSU board seems to have some damage, but it's difficult to identify what should be done. It's a 600W Lite-on supply. There are plenty of photos online of the top side of the PCB, but none of the underside. The supply has a couple of last-minute-fix looking components that are, I think, grounded through one of the PCB mounting screws. The top side has one near the spot where the connector cables are, and on the underside at the same position there is a couple of components shielded from the rest of the PCB with a tape. Those on the underside had corrosion and I'm not sure where to connect them. It looks like the corrosion took away some of the solder. Would anyone happen to have photos of a non-damaged LiteON supply PCB, both sides?
     
  2. oi!, Feb 24, 2016
    Last edited: Jul 14, 2016
  3. mortar thread starter macrumors newbie

    Joined:
    Sep 10, 2014
    #3
    I'll try to post pics of the PCB somewhere. The LCSs I know rather well - I fixed one - and I'm not going to spend effort on this one. This Delphi V1 unit is not worth the effort, really. The V2 unit (Quad) I serviced is still running fine, it has a much better design. I'm going to try to retrofit this G5 with air cooling.

    The lower-end dual and single G5s have a 450W PSU which won't cut it. It can't even be used for spares as the whole thing, even the casing is different.
     
  4. MagicBoy macrumors 68040

    MagicBoy

    Joined:
    May 28, 2006
    Location:
    Manchester, UK
    #4
    Just replace the PSU with a salvage unit. They've got a habit of failing anyway. I got one for £10 delivered on eBay...
     
  5. mortar thread starter macrumors newbie

    Joined:
    Sep 10, 2014
    #5
    Returning to this, here are some photos. First, the whole top PCB:

    psutop.jpg

    Then, the loose part on the top side, which I'm pretty sure was teid to the PCB mounting screw and thus grounded through that: psutoploose.jpg

    Then, the whole underside of the PCB:
    psubot.jpg
    And finally, the loose part there:
    psubotloose.jpg

    The loose part in the last picture is my main issue. I'm supposing that the three pins that are no longer connected to anything (measured them) had solder connecting them to each other and the ground via the mounting hole surroundings. The pins had corroded stuff around them that just fell off and I think that was the solder blob joined by dried coolant.

    I'm not sure what the blue stuff around the mounting hole is, but I think it could be remains of loctite.

    If anyone familiar with PSU electronics can chime in, I'm all ears.

    FWIW the previous owner said the machine actually powered on in its corroded state, so I'm cautiously optimistic. The PCB at least cleaned up rather well.
     
  6. MagicBoy macrumors 68040

    MagicBoy

    Joined:
    May 28, 2006
    Location:
    Manchester, UK
    #6
    Why are you messing around with a water damaged PSU when known good units are available secondhand for very little money?
     
  7. mortar thread starter macrumors newbie

    Joined:
    Sep 10, 2014
    #7
    The corroded pile cost me 20 eur iirc. Ain't gonna put any more money into it. I had some other parts left over from other "projects" to make a whole machine, except now maybe the PSU. I don't need this machine - as if anyone needed a G5 monster anymore - but I just want to see if I could turn something that will otherwise go to the metal recycling bin into something more useful with a couple of hours of work. If I needed another machine like this, I could get a full working G5 for the same amount of money I'd have to pay for an ebay sourced PSU + shipping (haven't seen PSUs locally).
     

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