820-3332 - short on ppvcore_gpu and on gfximvp

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  • CornholioGSM
    Badcaps Veteran
    • Feb 2014
    • 263
    • CZECH
    #1

    820-3332 - short on ppvcore_gpu and on gfximvp

    Hello,
    i have here retina 12 macbook with no video. U8900 is soldered well, but i have nothing on gpu vcore and it looks shorted.
    After inspect under microscope i see that gfximvp way on pin 14 on u8900 is blown or cutted from previous service...so way is repaired but looks shorted too
    Macbook with chime with no picture and no backlight.
    I mean that is fully dead gpu.
    Tags: None
    • piernov
      Super Moderator
      • Jan 2016
      • 4435
      • France
      #2
      Re: 820-3332 - short on ppvcore_gpu and on gfximvp

      What's the exact resistance to ground?

      You can take off U8900/Q8931/Q8930/Q8961 and see if the short goes away.

      dGPU can be disabled by jumping all the DP_INT_IG_ML_* lines to the corresponding DP_INT_ML_C_* on U9150 but I haven't tested this method.
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

        Comment

        • CornholioGSM
          Badcaps Veteran
          • Feb 2014
          • 263
          • CZECH
          #3
          Re: 820-3332 - short on ppvcore_gpu and on gfximvp

          on gpuvcore i have 0.04, on gfximvp 1.28 ...and still same after remove all parts
          Maybe full disable nvidia is good idea...can you tell me more how to do it ? I have only experience with 2011 models - for it i have lattice programmer
          EDIT you mean remove u9150 and jump all ways (example) DP_INT_IG_ML_N<0 to DP_INT_ML_C_N<0 ?
          Last edited by CornholioGSM; 05-19-2020, 08:44 AM.

            Comment

            • piernov
              Super Moderator
              • Jan 2016
              • 4435
              • France
              #4
              Re: 820-3332 - short on ppvcore_gpu and on gfximvp

              This one cannot be bypassed by reprogramming the GMUX. You have to run the jumper wires by hand.
              OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                Comment

                • CornholioGSM
                  Badcaps Veteran
                  • Feb 2014
                  • 263
                  • CZECH
                  #5
                  Re: 820-3332 - short on ppvcore_gpu and on gfximvp

                  soo it really looks that dgpu is dead?
                  soo i go to remove 9150 and jump it

                    Comment

                    • CornholioGSM
                      Badcaps Veteran
                      • Feb 2014
                      • 263
                      • CZECH
                      #6
                      Re: 820-3332 - short on ppvcore_gpu and on gfximvp

                      done ... and still nothing on display and no backlight ....nothing on PP5VR3V3_SW_LCD

                      How about jump DP_INT_IG_AUX_P / N to DP_INT_AUX_C_P / N ?
                      Attached Files
                      Last edited by CornholioGSM; 05-19-2020, 11:43 AM.

                        Comment

                        • piernov
                          Super Moderator
                          • Jan 2016
                          • 4435
                          • France
                          #7
                          Re: 820-3332 - short on ppvcore_gpu and on gfximvp

                          Ah yes sorry the AUX lines must be jumped too.
                          OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                            Comment

                            • CornholioGSM
                              Badcaps Veteran
                              • Feb 2014
                              • 263
                              • CZECH
                              #8
                              Re: 820-3332 - short on ppvcore_gpu and on gfximvp

                              hmmm...nothing...only chime
                              How about PP5VR3V3_SW_LCD on J9000? Here must be after switch on 5V for check if is lcd connected...correct? ... i have nothing.
                              On U9000 i have 5V on VIN...so maybe is U9000 dead...or is problem with U9100
                              Last edited by CornholioGSM; 05-19-2020, 03:42 PM.

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