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Thread: Weird PSU issue

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    Default Weird PSU issue

    Hey guys, I don't think this would qualify as a problem, but more of a "I can't believe it's running issue".

    Let me start from the beginning...
    I built my 3rd mining rig in February, the parts consisted of:

    Sempron 145@stock
    Asrock 970 Pro3 2.0
    Gskill Ripjaws 1600 4gb
    Seagate Momentius 2.5 320gb
    MSI Gaming OC 270@1115/1500
    XFX DD 270@1115/1500
    CM i700 PSU
    open air
    box fan for cooling

    It ran great until two weeks ago, when I came home to the smell of burnt plastic.
    Checked out all my rigs and discovered that the CM i700 on my newest creation had shit the bed.
    So I immediately pulled the power cable from the back of the PSU, unhooked all the cables and inspected the mobo and video cards for damage.

    Everything appeared fine. So I hunted around the house for a suitable replacement as downtime cost me money.
    Tried a few smaller 500w units I had kicking around and no dice.
    They would run, but cgminer would crash after about 5mins into a workload.

    The only other PSU's I had capable enough to run that rig, were already in service..smh.
    So I dug through the PSU graveyard out in the garage, and discovered the old Ultra X3 1KW that I had gotten from JG eons ago, I had pulled it from service back in 2012(been using it for 5years 24/7 prior) for refusing to power on.
    I then remembered that I never paperclip jumped it.

    I set it up on the work bench, attached the 24pin cable and a molex strand, hooked a 80mm fan to it and inserted the paperclip. Plugged in the power and flipped the switch and the fucker fired up!

    I was overjoyed and pissed off at that moment.
    I danced a little jig and cursed the gods at the same time. Ran in the house with the newly revived X3 and commenced setting it up on my down and out mining rig.
    And wouldn't you know it...it would NOT start.
    So I unhooked one of the video cards, still no joy, unhooked both, still nothing.

    At this point I was perplexed to say the least. I tried every combo I could think of with the X3. I decided to jump it again with just the a fan and a hd, didn't work. Unhooked the hd and it fired up.

    I was ready to call it quits, then I decided to hook a old V series 500w Ultra to just the mobo and hd, and paper clip the X3 connected to just the 270's...lo and behold it fucking worked!!!

    And it's still working since I powered it up 2 weeks ago!

    Now what in the holy hell could cause this issue? protection fault?
    Bad power good signal from the 24pin? Even though it's working with the paperclip mod? Visually every thing looks good under the hood when I first pulled it 2 years ago, that's why I never shit canned it.

    This has really been bugging me since I installed it, but it did save me from having to wait a few weeks for a RMA from CM. Hell I'm not even sure I will replace the X3 when the new i700 arrives.

    Your thoughts are much appreciated on this matter gentleman.
    MSI P67A-GD65
    i72600K@4.8
    Corsair H70
    4x4Gb GSkill Ripjaws 16Gb 1600
    MSI 670 GTX PE/OC
    2x750Gb Seagate Barracuda's RAID 0
    Zalman ZM-MFC1
    Lite-On Dvd burner
    SB X-FI Xtreme Gamer Fatal1ty Pro
    Silverstone Zeus ST85ZF
    Coolermaster HAF-932
    "Experience is the benchmark of maturity"

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    cheapie's Avatar
    cheapie is offline That weird furry girl they warned you about
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    Do you get the power good signal (gray wire, 5 volts) while it's running with the paperclip?

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    Quote Originally Posted by cheapie View Post
    Do you get the power good signal (gray wire, 5 volts) while it's running with the paperclip?
    I haven't tested it with a multimeter yet, being as I've misplaced it somewhere. In case your interested, the paperclip is in the 4th socket from the top left (green) and the 12th socket (black) top extreme right.

    I can tell you this, it will NOT power on with the 24pin in the mobo, regardless of peripherals connected or not.
    I could hook one hd up to it now in it's present configuration and it would fail to power up as well.
    The only cables connected are the 24pin and two 6 pin PEG's.
    MSI P67A-GD65
    i72600K@4.8
    Corsair H70
    4x4Gb GSkill Ripjaws 16Gb 1600
    MSI 670 GTX PE/OC
    2x750Gb Seagate Barracuda's RAID 0
    Zalman ZM-MFC1
    Lite-On Dvd burner
    SB X-FI Xtreme Gamer Fatal1ty Pro
    Silverstone Zeus ST85ZF
    Coolermaster HAF-932
    "Experience is the benchmark of maturity"

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    cheapie's Avatar
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    Quote Originally Posted by CAD4466HK View Post
    I haven't tested it with a multimeter yet, being as I've misplaced it somewhere. In case your interested, the paperclip is in the 4th socket from the top left (green) and the 12th socket (black) top extreme right.

    I can tell you this, it will NOT power on with the 24pin in the mobo, regardless of peripherals connected or not.
    I could hook one hd up to it now in it's present configuration and it would fail to power up as well.
    The only cables connected are the 24pin and two 6 pin PEG's.
    So, you're saying that it won't power up with a paperclip with just a hard drive attached (no motherboard)?

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    Quote Originally Posted by cheapie View Post
    So, you're saying that it won't power up with a paperclip with just a hard drive attached (no motherboard)?
    That's exactly what I'm saying.
    It will start up with just a 80mm fan connected when jumped with a paperclip though.
    MSI P67A-GD65
    i72600K@4.8
    Corsair H70
    4x4Gb GSkill Ripjaws 16Gb 1600
    MSI 670 GTX PE/OC
    2x750Gb Seagate Barracuda's RAID 0
    Zalman ZM-MFC1
    Lite-On Dvd burner
    SB X-FI Xtreme Gamer Fatal1ty Pro
    Silverstone Zeus ST85ZF
    Coolermaster HAF-932
    "Experience is the benchmark of maturity"

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    Bad cable or cable from a other PSU with a different pin-out?

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    Quote Originally Posted by -The_Mask- View Post
    Bad cable or cable from a other PSU with a different pin-out?
    I thought it could possibly be a bad 24pin cable, but what would that have to do with it not starting up with a hd connected, while it's being jumped with a paperclip?

    I tried ALL the different molex strands that came with the X3, and tried them in ALL the ports on the PSU with the same results.
    BTW, I only used the cables that came with the X3, which were all being utilized (except the 6pin and 8pin PEG's) before it stopped powering up in 2012.
    FYI, I don't have any other modular cables to test the theory of a bad cable(s).
    I really do appreciate your input in this matter.
    MSI P67A-GD65
    i72600K@4.8
    Corsair H70
    4x4Gb GSkill Ripjaws 16Gb 1600
    MSI 670 GTX PE/OC
    2x750Gb Seagate Barracuda's RAID 0
    Zalman ZM-MFC1
    Lite-On Dvd burner
    SB X-FI Xtreme Gamer Fatal1ty Pro
    Silverstone Zeus ST85ZF
    Coolermaster HAF-932
    "Experience is the benchmark of maturity"

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