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Thread: Corsair AX1200i - Two units failed with unit tripping at power up and boot loop.

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    Default Corsair AX1200i - Two units failed with unit tripping at power up and boot loop.

    Hello,

    I am hoping someone on this forum might be able to help me out with a problem I have seen on two Corsair AX1200i units that I own. Both units were purchased new.

    First AX1200i was driving the following system:
    Asus Z87 Deluxe Dual, i7-4770K, HD7970OC 6GB crossfired with R9 280x 3GB, 32GB DDR3, 1TB SSD.

    The AX1200i ~ worked ok for ~ 3 years however I started to notice that sometimes during running the PC it would power off when gaming or running blender. Then I started having issues at boot up and logging into windows the PC would "reset". There were no indications that the Corsair PSU was tripping out (No red led flash on the PSU or requirement to reset the PSU).

    I started to use bitlocker encryption on the OS drives and it got to the stage where I could not even enter the bitlocker encryption code during windows start up process before the PC would reset itself.

    As part of the debug process I removed everything from the motherboard, cleaned the motherboard and checked it. I tested what was happening at start up if I simply connected the motherboard to the AX1200i PSU.

    The AX1200i unit was tripping out with the motherboard.

    I tested that motherboard with a new AX1200i and it worked fine.

    The unit was RMA'ed to Corsair and I was purchased a Corsair SF600 and removed the HD7970 OC 6GB and kept my PC running whilst waiting for the replacement.

    The replacement AX1200i has been working o.k.

    Second AX1200i was running the following system.
    Asus Z97 Deluxe NFC&Wireless, i7-4790K, Dual PowerColor R9 Nano in Crossfire, 32GB DDR3, 1TB SSD.

    I have not experienced the PC shutting down during normal operation.
    However it started to intermittently trip out at boot up. similar to the first failed AX1200i.
    As before the tripping during boot up worsened. It became more frequent and time before reset shortened.

    I swapped the PSUs between the two machines as the second machine is the one I was working on most and I need it more. This was also done as a test of the two systems with the different supplies.
    The second AX1200i intermittently tripped out on the Z87 motherboard system during boot up and the replacement PSU for the first failed AX1200i unit works fine on the Z97 system.

    I opened an RMA with Corsair. It got to the point where I had to wait for hours before even attempting to boot up.
    It does not seem to happen if I do not run the PSU for ~ 1 day. In that case I seem to be able to boot up and log in after one or two attempts.

    I also tested again what happens if I drive only the Z87 motherboard with the failed AX1200i, the replacement AX1200i, and the spare SF600. Same thing as before. The failed AX1200i is cutting off the supply to the motherboard and doing a "boot loop". The replacement AX1200i and the SF600 run the motherboard fine.

    So now for the second time I have an AX1200i Unit failing after ~ 3 years of use which has to be RMA'ed, with the ~ same issue with tripping out at boot up.

    I need to keep my systems running and I am tired of this happening with AX1200i. The SF600 is not good enough as an emergency PSU so I am going to have to purchase a backup 1200W PSU.

    The Corsair RMA process is lengthy, costly, and difficult.
    For example all of the power cables in the PC are tied down and Corsair are asking me to rip them out and send them in with the failed unit.
    I also have to pay the return postage. It has to be signed for and tracked.
    If I request an express RMA the RMA postage cost is international post which costs lots.
    I have to photograph everything before return.
    Express RMA has to be paid for up front.
    The PC downtime and debug costs me time and money.

    Has anyone else had similar experience with AX1200i units?

    Is this an issue known to Corsair? Have they done something to fix it on AX1200i. Does it happen with AX1500i, 1600i?

    I intend to do at least 2 new Threadripper + MultiGPU builds soon and this time I was looking for the Corsair AX1600i but this failure of a second Corsair AX1200i has completely put me off purchasing AX1600i for my next builds.

    Is their something about my PC Specs or system that might cause this?

    Can someone suggest a most appropriate alternative to AX1200i
    which will work for more than 3 years of it's 5 year warranty period?

    For the second time I have an RMA on an AX1200i unit.
    These units should not fail. They are not cheap.

    If anyone wants I can post a video to show the failure.

    Thanks.
    Last edited by colesdav; 04-24-2018 at 11:02 AM. Reason: Grammar, added some more information.

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    There's either something wrong with your build that's tripping protection on the PSU or something wrong with your mains voltage that's tripping protection.

    The MCU's are very sensitive. May just want to switch to an analog PSU. Ask Corsair to replace with an HX1200i and call it a day.

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    Hmm, by any chance, do you have asus anti surge on? (it's in the bios of your motherboard).

    Why isn't the SF600 good enough as an emergency psu?

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    Quote Originally Posted by jonnyGURU View Post
    There's either something wrong with your build that's tripping protection on the PSU or something wrong with your mains voltage that's tripping protection.

    The MCU's are very sensitive. May just want to switch to an analog PSU. Ask Corsair to replace with an HX1200i and call it a day.
    Hi, thank you for your reply.

    RE: ]There's either something wrong with your build that's tripping protection on the PSU.

    I have removed motherboard from both builds, removed the RAM, CPU, etc, and just run those motherboards from Failed AX1200i, replaced working AX1200i, working SF600, and again with the failed AX1200i units in sequence to demonstrate the problem. If the failed units still trip out just running the motherboard but new AX1200i or SF600 work fine with the motherboard then that indicates a problem with the PSU to me. Those motherboards are a few years old now, but the pass all ASUS checks, SiSoft Sandra checks.

    The PC's work fine initially, then the tripping behaviour starts after 2-3 years of use in both cases. If I simply replace the failed AX1200i with a new AX1200i into the same PC build, no tripping out.
    Similarly fitting an SF600 (but loosing some hardware in that case due to fewer hard drives / GPU's connected) instead of the failed AX1200i, PC works fine with no tripping out.

    There does seem to be a problem with the AX1200i PSU's I received.
    Maybe I have just been very unlucky and received a pair of faulty units. They were purchased 1 year apart from different suppliers though.

    The previous RMA'ed AX1200i unit was confirmed to have failed by Corsair Returns. My assumption is they test RMA'ed units on new motherboards or specialised PSU monitoring hardware.
    I am reasonably confident if they thought I had done something wrong with the PC Build or abused the PSU in some way I would have voided the warranty and had to pay for a replacement unit myself.

    RE: something wrong with your mains voltage that's tripping protection.

    The Mains voltage is O.K. as far as I know. Both PC's are connected to the mains via a high quality PC mains filter and surge protector of some form since first use.
    I had the electrics on this property checked by qualified electrician and new mains wiring and supply box with earth leakage protection trip was fitted before I started using either AX1200i Unit.
    I do not seem to be having any problem with other PC's or laptops I run failing like this. This seems specific to the AX1200i powered PCs.

    The second AX1200i Unit which failed was running on a PC with an an APC 1500W UPS Battery Backup which has a mains voltage monitor and supply noise and surge protection. I set the APC Unit to the most sensitive setting. I have not seen it trip due to mains supply noise or surge. I check the logs most weeks. The battery backup has kicked in a few times in early hours of the morning when the mains voltage RMS seems to decrease slightly every night, that is likely just because I was running the APC Unit on most sensitive setting for mains voltage tolerance as well. We have not had the mains cut out for at least 3 years that I can remember.

    Even with all of that protection in front of the AX1200i the tripping behavior started on that PC fitted with the AX1200i unit later on. I do not think I could have been more careful in that regard.

    However, given the second unit has failed, I will get another, different electrician in and discuss this situation with them and see if they can find anything wrong with the mains supply again just in case.
    Thanks for raising that point.


    RE:

    The MCU's are very sensitive. May just want to switch to an analog PSU. Ask Corsair to replace with an HX1200i and call it a day.[/QUOTE]

    Thanks, I had not considered the HX1200i. I will take a look at that PSU as an alternative to the AX1200i.

    Thanks again for your help and advice.

    Bye.
    Last edited by colesdav; 04-24-2018 at 11:32 PM.

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    Quote Originally Posted by colesdav View Post
    The PC's work fine initially, then the tripping behaviour starts after 2-3 years of use in both cases. If I simply replace failed unit with a new AX1200i, no tripping out.
    Because there's something wrong with the motherboard.

    Quote Originally Posted by colesdav View Post
    The second AX1200i Unit which failed was running on a PC with an an APC 1500W UPS Battery Backup which has a mains voltage monitor and supply noise and surge protection.
    Line interactive UPSs only kick in when they need to run on battery power. Otherwise, your PSU is still running on the mains.

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    Which UPS from APC do you have? APC has a lot of different 1500VA versions.

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