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    #1

    Computer Shuts Down and won't restart with out unplugging.

    I have an Enermax 351 p-ve. and an Asus Cusl-2 motherboard. Pentium 111 933 .Not overclocked.

    It will just randomly shut off as if I did pull the plug. And it will not start untill the plug is pulled and left for a while. Or I shut off the power supply using its switch and leave it off for a while, usually half an hour. I can leave it off over night when the room temp is 50 F. and it will not start in the morning unless I have "pulled the plug" .

    Any ideas as to the cause?
    Tags: None
    #2
    Re: Computer Shuts Down and won't restart with out unplugging.

    Sounds like a PSU problem, most likely.
    Ludicrous gibs!

    Comment

      #3
      Re: Computer Shuts Down and won't restart with out unplugging.

      Yea, I had a real cheap L&C PSU do exactly that...

      And also a Nexus PSU with the same behaviour, both due to bad caps and problem solved by swapping them out...
      "The one who says it cannot be done should never interrupt the one who is doing it."

      Comment

        #4
        Re: Computer Shuts Down and won't restart with out unplugging.

        I can think of two protection mechanisms that can cause this kind of latching into an off state. The first is over voltage protection. If one of the main O/Ps - +3.3V, +5V, or +12V - go out of regulation high, the OVP circuit shuts down the P/S and latches it off. Usually cycling AC power for a minute or so will reset the latch. Crap caps could allow the ripple amplitude to exceed the OVP threshold. The other possibility is over temperature protection. OTP would also latch the P/S off. Likely cause of OTP trip would be a bad fan, dust compromising the effectiveness of the heatsink, or a fan speed control circuit that doesn't increase the fan speed as the temperature rises. Given the half hour necessary to reset the P/S, I'd guess that the problem is OTP if the P/S is the problem.
        PeteS in CA

        Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
        ****************************
        To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
        ****************************

        Comment

          #5
          Re: Computer Shuts Down and won't restart with out unplugging.

          just had an enermax psu here with intermittant shutdown.
          had a bad fan and crap caps.had 2v p-p on +5

          Comment

            #6
            Re: Computer Shuts Down and won't restart with out unplugging.

            Originally posted by kc8adu
            just had an enermax psu here with intermittant shutdown.
            had a bad fan and crap caps.had 2v p-p on +5
            Got some pics?

            I wanna see.
            My gaming PC:
            AMD Phenom II X6 1100T Black Edition 3.3GHz Six-Core CPU (Socket AM3)
            ASUS M4A77TD AMD 770 AM3 Motherboard
            PowerColor AMD Radeon RX 480 8GB GDDR5 PCI-Express x16 3.0 Graphics Card
            G.SKILL Value Series 16GB DDR3-1333 RAM (4x4GB dual channel)
            TOSHIBA DT01ACA200 2TB 3.5" SATA HDD (x2)
            WD Caviar Green WD20EARX 2TB 3.5" SATA HDD
            ASUS Xonar DG 5.1 Channel PCI sound card
            Antec HCG-750M 750W ATX12V v2.32 80 PLUS BRONZE Power Supply
            Antec Three Hundred Mid-Tower Case
            Microsoft Windows 10 Pro 64-bit
            Microsoft Windows 7 Ultimate SP1 64-bit

            Comment

              #7
              Re: Computer Shuts Down and won't restart with out unplugging.

              Originally posted by Newbie2
              Got some pics?

              I wanna see.
              already fixed and gone.
              got a better one to post later though.stay tuned!

              Comment

                #8
                Re: Computer Shuts Down and won't restart with out unplugging.

                Gentlemen
                Thankyou all for your fast responses.

                I pulled out the PS and opened it up. Blew out the dust and I could see TWO BAD CAPS, one large one and one Small one. Both were domed (bulged) and had what looked like rust on top.

                The power supply never felt hot when I touched it after it would shut off.

                I went out and bought a new Enermax Liberty 500 watt 130$ Canadian.
                More than I need for this computer, but I am thinking about repairing the old power supply and putting it back in, saving the new one for a new computer I hope to build in the new year.

                With the new PS installed it booted fast, no hangups as before.

                Okay so I have a soldering gun, do I dare try to replace the caps on my own? What am I looking at for skill level?

                Thank you ever so much for the fast help.

                Ps: My computer started giveing me the shutdowns last Feb. When I took it in to have the PS tested at the store I bought it from, the guy just pluged in a tester and said the PS was good. So I spent almost a year checking out the Bios, memory, fans, off on switches, heatsink/thermal compuound, motherboard and on and on.
                When my 12 year old son gets home tonight and I tell him I fixed the computer, he will just roll his eyes and say ya dad just like everytime before.

                HE HE . I think I did this time though.

                Adam Zonker
                Southern Alberta Canada
                20F clear skys

                Comment

                  #9
                  Re: Computer Shuts Down and won't restart with out unplugging.

                  I'm guessing those two failed caps are made by PCE-TUR, a bad cap manufacturer.

                  What is the wattage of that soldering gun? We normally use soldering irons here but maybe that soldering gun can do the job, but we recommend 60-watts as the wattage for the soldering iron or maybe soldering gun.

                  Can you please post the capacitance and voltage of the two bad caps? That information will be useful.
                  Last edited by willawake; 12-31-2005, 05:17 AM. Reason: long quote of post #8 removed
                  My gaming PC:
                  AMD Phenom II X6 1100T Black Edition 3.3GHz Six-Core CPU (Socket AM3)
                  ASUS M4A77TD AMD 770 AM3 Motherboard
                  PowerColor AMD Radeon RX 480 8GB GDDR5 PCI-Express x16 3.0 Graphics Card
                  G.SKILL Value Series 16GB DDR3-1333 RAM (4x4GB dual channel)
                  TOSHIBA DT01ACA200 2TB 3.5" SATA HDD (x2)
                  WD Caviar Green WD20EARX 2TB 3.5" SATA HDD
                  ASUS Xonar DG 5.1 Channel PCI sound card
                  Antec HCG-750M 750W ATX12V v2.32 80 PLUS BRONZE Power Supply
                  Antec Three Hundred Mid-Tower Case
                  Microsoft Windows 10 Pro 64-bit
                  Microsoft Windows 7 Ultimate SP1 64-bit

                  Comment

                    #10
                    Re: Computer Shuts Down and won't restart with out unplugging.

                    Newbie2

                    Your guess is right they are PCE TUR

                    Here is what it says on the Caps.

                    The small one:
                    105 C
                    0003
                    PCE TUR
                    1000 UF
                    10V
                    VENT

                    The large one:
                    105c
                    0002
                    3300UF
                    10V
                    VENT

                    The soldering gun I have is A Weller
                    60A 120V 2.5

                    Comment

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