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Thread: H55M-USB3 random shutdowns, will not power on afterwards.

  1. #31
    Join Date
    Jun 2010

    Default Re: H55M-USB3 random shutdowns, will not power on afterwards.

    Just received my motherboard back from Gigabyte's RMA repair, and at least one of the reported issues remains.

    CPU_FAN is still broken, with a standard Intel heatsink fan at only 1060 RPM when BIOS is set to fixed maximum speed. (just barely spinning, and entirely silent). I saw 65*C while doing nothing more than downloading & installing GPU drivers.

    I have no way of knowing if the sudden shutdown issue has been resolved without running the machine for a week or two, but I cannot do this when the board can't even keep the CPU cool.

    What am I supposed to do now? I am certain there are electrical issues with this board, and I just spent ~$30 to ship it in for RMA only to have it come back with one, if not all the reported issues unresolved, and repairs to seemingly unrelated parts (PCI-E slot and a capacitor related to the USB 3.0 port)


    Found some molex to 3pin adapters with an extra sense wire for the mobo and did some testing

    Intel HSF running off CPU_FAN header with BIOS set to fixed maximum = ~1050RPM
    Intel HSF connected via molex adapter to PSU, yellow sense wire to mobo = ~2100RPM

    Scythe +12v case fan (the 'M' 1200RPM model). Connected to CPU_FAN = ~850RPM
    Scythe onnected to SYS_FAN = 700RPM
    Scythe with molex & sense wire = ~1250RPM

    From my experience with undervolting the scythe in the past, there is no way CPU_FAN is putting out above 9-10v, with SYS_FAN closer to 7-8V
    Last edited by Logicaluser; 03-27-2013 at 06:47 AM.

  2. #32
    Join Date
    Aug 2009
    Birmingham,Great Britain

    Default Re: H55M-USB3 random shutdowns, will not power on afterwards.

    I don't know what to suggest,if it still has the issues then id contact gigabyte again and tell them,insist that they cover postage this time as problems are still there
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