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Missing voltage on ZOTAC GTX 1050 TI 4gb coil - need schematic

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    Missing voltage on ZOTAC GTX 1050 TI 4gb coil - need schematic

    Hello to all,

    I have a missing voltage on this ZOTAC GTX 1050 TI mini card (circled in blue)
    I have all my other voltages strangely but the missing one goes up to 0.04 V and measured in Ohm 45 Kohm I find that really high and I expected much less than that.
    0 SHORT circuit on the rest of the board
    GPU heating and voltage at the coils 0.80 V which is normal for this type of card logically.


    Without a schematic it's quite complicated and long to look for.

    Do you have an idea?
    I checked all my components seems present and checked in 2 times with the microscope and no missing.

    With the thermal camera nothing heats up except a 2 Kohm resistor (noted 30B) but I find well my 12 V on one side

    Many thanks in advance,

    If you need more pictures I will send you some if necessary
    Last edited by fab13; 05-31-2022, 02:58 PM. Reason: add Picture

    #2
    Re: Missing voltage on ZOTAC GTX 1050 TI 4gb coil - need schematic

    Photo
    Attached Files

    Comment


      #3
      Re: Missing voltage on ZOTAC GTX 1050 TI 4gb coil - need schematic

      u need check some voltage level:
      12v,5v,3.3v,1.8v,1.05v boot, 0.9-0.8v gpu, 1.5-1.35v ram
      PC work for schemaltic:
      Mainboard: Gigabyte Z68XP-UD4
      CPU: I3-3240
      Ram: 16Gb
      Graphic Card: GTX 1050Ti zotac 4Gb Mini
      SSD: 120Gb
      HDD: 2Tb

      Comment


        #4
        Re: Missing voltage on ZOTAC GTX 1050 TI 4gb coil - need schematic

        I was able to test the rest of the system, I have my voltages up to the GPU.
        This coil L11 is surely the missing 1V voltage.

        I could point with the probes and see where it is powered and it seems that it is powered by a Q4 transistor which is probably a PNP transistor (Test positive probe of the Base and
        black probe on Transmitter = blocking
        Test positive probe from Base to Collector = blocking
        Positive probe test from Collector to Base = on, i.e. approximately 0.610 V

        So I replaced by an equivalent transistor and I could find 1,09V

        Now when I turn on the card the display port is now recognized but black screen and HDMI

        Maybe the wrong transistor installed? or insufficient voltage on this L11 coil? I could measure now 1.09V
        I am doing wrong?

        See the pictures

        Thanks a lot =D
        Attached Files

        Comment


          #5
          Re: Missing voltage on ZOTAC GTX 1050 TI 4gb coil - need schematic

          L11 is coil supply voltage for Fan! Haiz! First check and find 1.8v coil
          PC work for schemaltic:
          Mainboard: Gigabyte Z68XP-UD4
          CPU: I3-3240
          Ram: 16Gb
          Graphic Card: GTX 1050Ti zotac 4Gb Mini
          SSD: 120Gb
          HDD: 2Tb

          Comment


            #6
            Re: Missing voltage on ZOTAC GTX 1050 TI 4gb coil - need schematic


            Same same 70% and good luck
            Attached Files
            PC work for schemaltic:
            Mainboard: Gigabyte Z68XP-UD4
            CPU: I3-3240
            Ram: 16Gb
            Graphic Card: GTX 1050Ti zotac 4Gb Mini
            SSD: 120Gb
            HDD: 2Tb

            Comment


              #7
              Re: Missing voltage on ZOTAC GTX 1050 TI 4gb coil - need schematic

              Thank you very much, that's the 12 V Fan

              The 1.8 V is present on the coil
              And the fan is rotating at maximum from the start

              Or do I have to look at another Enable signal?
              Display port detected by the screen but not the HDMI and black screen.

              I have my 1.5V VMEM and 0.80V on all GPU phases
              Also my 3.3V on the bios powered correctly as a whole.

              I have no idea lol

              Comment

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