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Blown component identification - EVGA 1000 GQ

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    Blown component identification - EVGA 1000 GQ

    Any idea what the green component is / value?

    Mine is completely blown and unidentifiable. Green disk risister

    I found some pics online that show it, either a varistor or thermistor i think.

    Next to the bridge rectifiers

    Some pics attached

    and more on jonnyyguru

    https://www.jonnyguru.com/blog/2015/...ower-supply/5/
    Attached Files

    #2
    Re: Blown component identification - EVGA 1000 GQ

    Yes it is a NTC thermistor to limit inrush current when the capacitors charge up from being off for some time.
    It is then bypassed by the relay next to it to increase efficiency.
    The value is not so important, it only needs to be large enough to survive the brief inrush.
    So anything from a similar rated power supply should be fine.
    "The one who says it cannot be done should never interrupt the one who is doing it."

    Comment


      #3
      Re: Blown component identification - EVGA 1000 GQ

      Originally posted by Per Hansson View Post
      Yes it is a NTC thermistor to limit inrush current when the capacitors charge up from being off for some time.
      It is then bypassed by the relay next to it to increase efficiency.
      The value is not so important, it only needs to be large enough to survive the brief inrush.
      So anything from a similar rated power supply should be fine.
      Any roughy values you could suggest, as would need to order one online and not sure what to get.

      Something like this

      https://www.ebay.com/itm/SCK-056-NTC...-/323908232878
      Last edited by mikay786; 09-13-2020, 01:33 PM.

      Comment


        #4
        Re: Blown component identification - EVGA 1000 GQ

        It may have blown due to relay contacts are bad and not bypassing it, or you may have shorts circuit, you need to check other component as well.
        Never stop learning
        Basic LCD TV and Monitor troubleshooting guides.
        http://www.badcaps.net/forum/showthr...956#post305956

        Voltage Regulator (LDO) testing:
        http://www.badcaps.net/forum/showthr...999#post300999

        Inverter testing using old CFL:
        http://www.badcaps.net/forum/showthr...er+testing+cfl

        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
        http://s807.photobucket.com/user/budm/library/

        TV Factory reset codes listing:
        http://www.badcaps.net/forum/showthread.php?t=24809

        Comment


          #5
          Re: Blown component identification - EVGA 1000 GQ

          The internal fuse is not blown if that is of usefulness.

          Now that the part is identified I’ll check for shorts on bridge rectifiers and around that area.

          Comment


            #6
            Re: Blown component identification - EVGA 1000 GQ

            https://www.rapidonline.com/NTC-Inrush-Limiters

            Some here as well

            Do I need low ohm or higher ohm versions?

            Comment


              #7
              Re: Blown component identification - EVGA 1000 GQ

              You can try once without it: the same will happen if the PSU is switched off and on quite fast:
              Then the NTC will not have time to cool down so it will be low resistance and thus the caps charge up violently instead.
              As budm said you should check other things, best to do this test with an incandescent light bulb, you can attach that in place of the NTC. (much better than a straight wire bypass)
              "The one who says it cannot be done should never interrupt the one who is doing it."

              Comment

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