G5 Quad LCS Questions

Discussion in 'PowerPC Macs' started by SuperKerem, May 12, 2015.

  1. SuperKerem, May 12, 2015
    Last edited: May 12, 2015

    SuperKerem macrumors 6502a

    SuperKerem

    Joined:
    Oct 29, 2012
    Location:
    London, England
    #1
    Hi, I recently got a Power Mac G5 Quad and upon taking it apart I realised that the grey CPU cover screw/pin was not there, meaning the CPU had been opened up before, possibly for a repair.

    I was wondering if anything has been modified/replaced visibly or not? This is a UK model. I, personally, don't have a clue.

    The LCS has the Delphi logo on it. I thought the Delphi LCSs were the unreliable ones that were prone to failure and the Panasonic ones were newer and more reliable? If this is a Late 2005 G5, why doesn't it have the Panasonic LCS?

    Also, I have heard about dual and single pump LCSs. I think this is the dual pump. Which is better? And why were there two LCS models? (is one a newer revised version??)

    Thanks everyone!
     

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  2. ptdebate macrumors 6502

    ptdebate

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    Jul 3, 2014
    Location:
    Dallas, Texas
    #2
    Don't take this as definitive, but I'm pretty sure all the quads shipped with better LCSes than the previous generation (the non dual core models). It was the dual 2.5 and dual 2.7 that were the most notorious. I use a refurbished dual 2.7 with the improved LCS.
     
  3. Lammer macrumors newbie

    Joined:
    Apr 2, 2015
    #3
    Yes that looks the same as mine.
    Those pipes are araldited and clamped looking as it does in the photo its is unlikely to have been touched

    Mine however has been by me and it is not an easy job so I would say its original. The unit may have been removed to replace a CPU maybe?.
    The grey plastic thing is called a "Click Rivet"
     
  4. SuperKerem thread starter macrumors 6502a

    SuperKerem

    Joined:
    Oct 29, 2012
    Location:
    London, England
    #4
    I know, but then why does the LCS have the Delphi logo on it? Pretty sure Panasonic made the improved LCSs. Hmm...

    ----------

    Strange. All the YouTube videos showing the Quad LCS have single pumps:

    https://www.youtube.com/watch?v=FLTyA1iSyg8&spfreload=10
    (16:50)

    https://www.youtube.com/watch?v=ofKAHa2xSMY&spfreload=10
    (1:25)
     
  5. Surrat macrumors 6502

    Surrat

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    Jun 20, 2014
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    United States
    #5
    The G5 Quads never came with the panasonic lcs. The claim is Apple decided the panasonic was unreliable, and stopped using it.

    They came with a single or dual pump version like you see on yours.
    The dual does seem to suffer problems a bit more than the single.

    Overall the G5 Quad had the least lcs problems of any G5 version, but they are 10 years old now, and problems shouldnt surprise anybody.
     
  6. poiihy macrumors 68020

    poiihy

    Joined:
    Aug 22, 2014
    #6
    Dang... that looks scary! :eek:
    Could liquid-cooled G5s be converted to air-cooled?
     
  7. bax2003 macrumors 6502a

    bax2003

    Joined:
    Dec 25, 2011
    Location:
    Belgrade, Serbia
    #7
    That is correct, only Dual 2.5 and more oftenly Dual 2.7. Plastic inlet frame is different with Panasonic LCS (922-6393-Delphi, 922-6394-Panasonic).

    It could but it would be much more louder.
     
  8. Surrat macrumors 6502

    Surrat

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    Jun 20, 2014
    Location:
    United States
    #8
    My dual 2.7 G5 looked nearly new when I got it, but after taking it apart, the LCS was leaking at the cpu blocks. The leak was just seepage, so no damage to anything yet. I didnt want to deal with trying to fix it and just tossed the lcs, converting the 2.7 over to air cooled using the heatsinks from a spare G5 dual 2.0. It works fine, does not overheat, and other than slightly louder fan noise, its great.
     
  9. bax2003 macrumors 6502a

    bax2003

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    Belgrade, Serbia
    #9
    I would not do this with Quad Core 2.5 GHz model. 2 cores more. When you push it, even with good LCS system, fans can rev up.
     
  10. Surrat macrumors 6502

    Surrat

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    Jun 20, 2014
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    #10
    You cant do it with the quad, I only said I did it with my dual 2.7.

    The quad has different mounts, and the older dual 2.0 heatsinks will not fit. The dual core 2.0 and 2.3 are air cooled, but they are setup for only a single cpu and you would need a machine shop to modify the heatsinks to get 2 of them in there for the quad.
     
  11. bax2003 macrumors 6502a

    bax2003

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    #11
    http://forums.macrumors.com/showthread.php?t=974595
     
  12. Surrat macrumors 6502

    Surrat

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    #12
    Very interesting, I hadnt seen that thread. I'm curious as to how he got that mounted in there, I could have sworn when I had my quad lcs out that the mount bolts were not in the same places.

    Thanks for the link.
     
  13. gavinstubbs09 macrumors 65816

    gavinstubbs09

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    NorCal boonies ~~~by Reno sorta
    #13
    The LCS system found in the Quad is much better designed than the systems used with the 2.5/2.7 DP. Some quads shipped with the single pump but I believe later in time (2006) they started to have dual pumps where the radiator is split into two separate reservoirs.

    For the trouble of air cooling a Quad there would be really no point. If this was a 2.5/2.7 it would be much easier to convert with heatsinks off a 2.0 or a 2.3 and the system would work fine. I converted one of my 2.7s to a 2.3 with the air cooled heatsinks, helped with heat quite a bit.
     
  14. SuperKerem thread starter macrumors 6502a

    SuperKerem

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    Oct 29, 2012
    Location:
    London, England
    #14
    Thanks, that's exactly what I was wondering! So the dual pumps DID come out later than the single ones...
     

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