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Thread: Burnt a MOSFET, Let's Diagnose Why!

  1. #11
    DNAJAY is offline Junior Member
    Join Date
    Oct 2015
    United States

    Default Re: Burnt a MOSFET, Let's Diagnose Why!

    [QUOTE=profJim;502180]The 8-pin or 4-pin cpu connector is needed for your system to start up.

    What do you mean by "fried instantly"? Was there smoke? Sparks? A loud pop?

    Did you get a new motherboard and did it fail the first time you powered it on with a minimal hardware setup?

    Have you tried powering on with your motherboard placed on a cardboard box outside of the computer case?

    Yup, it power went on, the CPU fan spun for about 1 second, then off. Tried again, then smoke. This was on the board I got back from gigabyte. So I bought a new board and tried again. New PSU, NEW MB, NEW PSU, and .... on, then immediately off.

    As for the 8pin thing, the computer won't post without, but the MB should power on. I initially tried with the 8pin connect, then again without, then again with and poof!

    I don't think it's bent pins because it has been working fine for five months, then one day..poof. The CPU itself looks immaculate actually. However, it's either the CPU or the I am going to RMA both. I've never heard of a CPU or RAM dying, then killing the MB in this way...but that's all that's left.

    I'll probably pick up a new case as well. I'm certain it's not the case's fault, but it's probably best to start from scratch here.

    Thanks for all the help! I'll keep you all updated on the journey!

  2. #12
    profJim's Avatar
    profJim is offline Chief Munchkin + moderator
    Join Date
    Dec 2008
    Tacoma, WA. [USA]

    Default Re: Burnt a MOSFET, Let's Diagnose Why!

    Closely inspect the motherboard and computer case for signs of damage, such as signs of a short circuit, including burn marks.

    A high quality power supply will quickly shut down when it detects over-voltage, over-current and with several other conditions.

    Double check that each of the nine motherboard stand-offs were securely mounted to the case and that each stand-off was aligned with the appropriate motherboard stand-off mounting holes. Make sure that there aren't any extra/unused stand-offs mounted underneath the motherboard.

    Short circuits can sometimes occur where the motherboard's rear I/O panel contacts the computer case.

    Are there any cables or wires that were located between the underside of the motherboard and the computer case?

    Have you closely inspected all wires and cables for signs of chafing or damage? USB cables? Audio cables?
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