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EVGA GTX 980 TI black screen when launching a game - Why?

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    #1

    EVGA GTX 980 TI black screen when launching a game - Why?

    I have a problem with an EVGA GTX 980 TI,

    I have a problem with an EVGA GTX 980 TI it displays a black screen when starting a game on the menu for example either in HDMI OR DISPLAY PORT.

    The basic problem is that the card does not boot, the FDMF 6823A mosfet shorts internally on the 12V line and I also changed an original one and now the card boots.

    Driver installation OK
    Detection of the card OK
    No black screen on the desktop
    No short circuit on the GPU
    All voltages stable

    The problem is when starting a game, black screen with the game sound in the background.
    The problem seems to happen at a higher current demand on the gpu.
    The card doesn't shut down and when I turn it back on the desktop is displayed.

    Work done
    - Changed again the controller by an original FDMF 6823A always black screen when starting a game (Value 6 Kohm on the 12 Volts seems ok), ohm test on the two internal mosfets at the gate ok about 30 Kohm) of the controller

    - Flash bios by a new version always black screen in game.

    What would be the cause ?
    Is it a bad soldering of the FDMF 6823A?
    What else should I check?


    Many thanks to you =D =D

    Translated with www.DeepL.com/Translator (free version)
    Attached Files
    Tags: None
    #2
    Re: EVGA GTX 980 TI black screen when launching a game - Why?

    See on GPUZ monitor everything seems detected

    1) GPU clock and well at 1102 mhz stable from the start of a game

    2) No code 43 in device manager

    What I just tried:
    Revert to old bios still same problem

    New 27 mhz crystal oscillator still same problem.

    I don't know what to do ^^
    Attached Files

    Comment

      #3
      Re: EVGA GTX 980 TI black screen when launching a game - Why?

      make memory error test

      Comment

        #4
        Re: EVGA GTX 980 TI black screen when launching a game - Why?

        try to run furmark on low resolution like 640x480

        Comment

          #5
          Re: EVGA GTX 980 TI black screen when launching a game - Why?

          Thanks for the feedback.

          Still the same in low resolution 640x480 in HDMI or DP at launch furmark
          Still rotating fan.

          VCORE test goes from 0.93 V to 0 V during black screen which is logical and stays at 0
          Reboot of the card and display ok on the desktop etc..
          Mosfet VRAM test ok in kiloOhm
          Test of all mosfets FDMF 6823A Gate,LGATE value in kiloohm and PWM too.
          Vcore ok in ohm no short circuit

          Test Mats some slight errors not exceeding 64 ? The numbers are low?

          I am lost, my resources are empty
          Another idea or test =D
          Attached Files

          Comment

            #6
            Re: EVGA GTX 980 TI black screen when launching a game - Why?

            check function of all phases with scope

            Comment

              #7
              Re: EVGA GTX 980 TI black screen when launching a game - Why?

              Checking all phases ok in the office and stable at 0.90V and even VRAM 1.50V
              As soon as the game is started 0V all phases Vcore and Vmeme and VPEX and with the thermal camera there is not one that overheats.
              I can hear a slight bang on the board but no short circuit.
              The previous owner tells me that he had to underclock the card to get it to work.

              Here are the measurements for each phase on the FDMF6823A dual mosfet controllers.
              All are approximately equal

              1 SMOD# = 300 Kohm / 0.7V diode mode
              2 Vcin= 1.7 k / 0.4V
              3 VDRV = 1.68 K / 0.45V
              4 Boot = Between 290 Kohm and 378 Kohm / 0.48V
              5 = Ground
              6 Gate Hight = Between 30 Kohm and 35K / 0.427 V
              7 PH = 2.4 ohm to GPU coil
              8 = NC
              9 to 14 = VIN = 12 Volts ok
              15 VSWH = 2.3 Ohm also goes to GPU coil
              16 to 28 = Ground
              29 and 35 = VSWH = 2.3 Ohm
              36 Gate Low = 30 Kohm / 0.427 V
              37 Ground
              38 THWN (Thermal warning flag) = No value
              39 Disb = between 290 kohm and 99 k
              40 PWM = between 6.2 Kohm and 7 Kohm = 0.427 V

              What is strange is that the first FDMF6823A row 1 on VIN pin 9 to 14 shows me no value in KOhm, Mohm, Ohm
              12V input measurement ok and 0.470 V

              Here's another idea? lol
              Attached Files

              Comment

                #8
                Re: EVGA GTX 980 TI black screen when launching a game - Why?

                i mean check function of vgpu phases with osciloscope

                Comment

                  #9
                  Re: EVGA GTX 980 TI black screen when launching a game - Why?

                  Thanks for your feedback
                  Do you find anything wrong with the measurements?


                  Ouch lol I don't have an oscilloscope yet

                  Is that enough on Aliexpress?

                  https://fr.aliexpress.com/item/10050...yAdapt=glo2fra

                  Comment

                    #10
                    Re: EVGA GTX 980 TI black screen when launching a game - Why?

                    better is usb scope like hantek or instrustar

                    Comment

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