bad 4.1 dual processor board?

Discussion in 'Mac Pro' started by caheyne, Dec 7, 2018.

  1. caheyne macrumors newbie

    Joined:
    Feb 12, 2014
    Location:
    Amsterdam/Fruitland Park
    #1
    What can be wrong on a 4.1 tray? It's only on the CPU B side. It's not the CPU, swapped several times. It's not the memory, swapped as well. With another tray everything is fine. I know this tray has been sitting in a computer who ran hot, it killed the CPU B, replaced it, but something else is damaged as well! What can it be? (it runs fine with only CPU A in it) I have several trays, they all run fine, except this one!
    No red diagnostic lights btw!
     
  2. startergo macrumors 65816

    startergo

    Joined:
    Sep 20, 2018
    #2
    Broken, bent or shorted pins on socket B pins?
     
  3. Slash-2CPU macrumors 6502

    Joined:
    Dec 14, 2016
    Location:
    New Orleans, USA
    #3
    Burned out VRM. The CPU heatsink also cools the CPU voltage regulator FETS. If the CPU baked, it’s likely these are toast as well.
     
  4. caheyne thread starter macrumors newbie

    Joined:
    Feb 12, 2014
    Location:
    Amsterdam/Fruitland Park
    #4
    Is there a way to check that and/or to repair this?
    --- Post Merged, Dec 8, 2018 ---
    Nope, checked them, they're all fine!
     
  5. Slash-2CPU macrumors 6502

    Joined:
    Dec 14, 2016
    Location:
    New Orleans, USA
    #5
    I’m sure that someone could replace the FETS and any other overheated, failed parts. Swapping them would be the test. It’s probably cheaper, faster, and easier to buy a used board from eBay than repair that one.
     
  6. caheyne thread starter macrumors newbie

    Joined:
    Feb 12, 2014
    Location:
    Amsterdam/Fruitland Park
    #6
    ordered a board for $350, arriving next week. I'll see if I can replace the FETS on the old board so I'll have a spare one. Thanks for the reply!
     
  7. Slash-2CPU macrumors 6502

    Joined:
    Dec 14, 2016
    Location:
    New Orleans, USA
    #7
    $350? Ouch. You can buy whole used trays off eBay for less.

    Edit. Nope. Never mind. Looks like the prices have come up a bit.
     
  8. mattferg macrumors 6502

    Joined:
    May 27, 2013
    #8
    Could be a weird bootROM issue. Have you tried it in a different Mac Pro?
     
  9. startergo macrumors 65816

    startergo

    Joined:
    Sep 20, 2018
    #9
    400 for a 5.1 dual tray recently .
     
  10. caheyne thread starter macrumors newbie

    Joined:
    Feb 12, 2014
    Location:
    Amsterdam/Fruitland Park
    #10
    Dual tray's difficult to find! I've looked everywhere, expensive!
    --- Post Merged, Dec 9, 2018 ---
    Yep, tried 'm in different MP's
     

Share This Page

9 December 7, 2018