Help asrock fm2a55m- vg3 missing 3.3v on ram

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  • christian0024
    Member
    • Apr 2016
    • 25
    • philippine

    #1

    Help asrock fm2a55m- vg3 missing 3.3v on ram

    Help asrock fm2a55m- vg3 missing 3.3v on ram
    Always beeping ram problem
    How can jumper the 3.3volts
  • dicky96
    Sun Seeker
    • Mar 2017
    • 1825
    • Spain

    #2
    Re: Help asrock fm2a55m- vg3 missing 3.3v on ram

    That motherboard is DDR3 so Vram is 1.5V not 3.3V

    There will be a VRM that generates Vram from some other supply, 5V, 3V or 12V

    You need to find that supply, it will probably be near the RAM slots

    If you cant' find the source of Vram just by lookihng, you can look up the pinout for DDR 3 sockets and trace it from there or you could trace it from the capacitors on DIMMs.

    Bear in mind some of the capacitors on the DIMM will be connected to Vref (0.75V) not Vram and one end of all capacitors will go to ground. You could have a short on Vram to ground also

    Rich
    Follow me on YouTube
    ------------------
    Learn Electronics Repair
    https://www.youtube.com/channel/UCFX...R8UZ2vg/videos

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    • piernov
      Super Moderator
      • Jan 2016
      • 4435
      • France

      #3
      Re: Help asrock fm2a55m- vg3 missing 3.3v on ram

      There's still a 3.3V power rail going to the RAM to power the I2C ROM for SPD, but it should be directly connected to the main 3V rail.
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

      Comment

      • dicky96
        Sun Seeker
        • Mar 2017
        • 1825
        • Spain

        #4
        Re: Help asrock fm2a55m- vg3 missing 3.3v on ram

        This should help

        Asrock FM3A55M Boardview
        Attached Files
        Follow me on YouTube
        ------------------
        Learn Electronics Repair
        https://www.youtube.com/channel/UCFX...R8UZ2vg/videos

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