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Msi mag b660 wifi ddr4 no power problem

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    Msi mag b660 wifi ddr4 no power problem

    Hello I have a msi mag b660 wifi ddr4 board that I'm unable to get to power on. Ive bought it off a auction site so no history on the board and no warranty, got it super cheap, trying to make a budget build and it backfired.

    I've tried to jump the power pins and also hook up the power switch from my case and no signs of life.

    i have jump the power supply while not connected to the board to confirm power supply is good and it is.

    I have installed the cpu, ram and graphics card than removed them one by one to rule out them as a fault.

    im now leaning towards something is wrong with this board, maybe a shorted component? I have limited electrical knowledge and only have a multimeter. If anyone knows of the area I should be checking that is maybe connected to the power switch and point it out that would be great

    thanks in advance for your help, I really don't want this turning ewaste even if I have to buy equipment to fix it.

    chris


    #2
    Ok so I got the suggestion to bypass the power switch a jump the PSON and GRD to see if the board would show any signs of life. The cpu fan started up but before i could check anything else a mosfet lit up like a candle. Any idea what this one controls the best guess I have is the 5v usb. Would this being shorted be causing my board not to start?

    Comment


      #3
      It's technically possible the chip itself was shorted and the motherboard was detecting the short and keeping itself from turning on a potentially killing itself/catching on fire. You could try checking the IC for shorts to ground with it still on the board and then remove it and check again to see if anything changes. If there is still a short after it comes off then you'd have to either check other places on the board or inject voltage into a short to see what is getting hot on the motherboard. If you do go the route of injecting voltage though you should absolutely remove any CPU you have installed just incase because you could accidentally kill the cpu injecting voltage.

      As for what component that is I hope you have a good picture of that area before it went up in smoke to be able to see what the marking is. Good chance theres a ton of compatible replacements that would fit just fine and it probably wouldn't be to hard to figure out one that would work, but it's always easier if you know what it is in the first place.

      Comment


        #4
        Hi, forcing the board to power on with the methods described is a very bad idea. Many boards will tolerate this, but some will get even more demages, especially if they are already somehow demaged. I'm afraid you made the situation only worse. Nontheless no board will start working normally with forcing PSON low. The whole power sequence logic will not start in this case, so the information you get out of this has no value.

        I have found a BV from a very similar board, so maybe this can help you to trace the issue.

        First what you should do is relace the burned device, so to get back to the initial state of the board, but do not try again to force the power on. After taking off the device check whether there are any shorts on the signals of this device (except GND pads). When you take off the burned device, pay attention, as some of the board pads may have melted with the pins of the device, then you need to carefully grind off the device / melted pins. Good luck.

        Link to boardview --> https://www.badcaps.net/forum/troubl...7d32-boardview

        The melted device seems to be a Richtek RT9742 - just a simple switch for 5V USB power. This might mean you have a short on the USB Power somewhere, most probably on some filtering caps for USB Power or the ESD protection devices near the USB pinheaders.

        Good luck.
        Last edited by DynaxSC; 09-23-2024, 06:20 AM.

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          #5
          DynaxSC definitely a wrong move on my part to force the PSON. i was under the impression that the problem was going to be the 3V not knowing that the power sequence will also check the 5V for a short to prevent start up. Thank for the boardview and i agree this looks like the part i need. Once i remove it carefully I'll check if the short still persists and investigate further while i wait for the part to come in. Hopefully I haven't done more damage to the board, but since i'm just starting out into this hobby if it is i'll take it as a learning experience.

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