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Asus X550VX rev 2 and Vram type

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    #1

    Asus X550VX rev 2 and Vram type

    Asus X550VX nvidia error 43, before replacing the graphics chip, having an identical card, I try to replace the vram. The voltage of the vram on the card is 1.35V but while this card uses Elpida W4032BABG VDD = VDDQ = 1.6V / 1.55V / 1.5V ± 3% and 1.35V ± 3% the donor card uses samsung 4KG41325FC-HC03 K memories : POD_18 (1.8V, 1.8V)
    ()
    How is it possible
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    #2
    Re: Asus X550VX rev 2 and Vram type

    The ninth character is an F so its F:POD_15 (1.5V,1.5V)

    4KG41325FC
    Last edited by SMDFlea; 05-09-2021, 10:53 AM.
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      #3
      Re: Asus X550VX rev 2 and Vram type

      ok
      thanks but not 1.35 (dual voltage as elpida) ?
      The dc/dc is a up1565p , which provides two (fixed ?) voltages, 1.5v and 1.8 so what I didn't understand about 1.35v ?
      Last edited by jasko_jacker; 05-09-2021, 11:12 AM.

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        #4
        Re: Asus X550VX rev 2 and Vram type

        Is the donor board the same revision,what part numbers on both are at PU9301
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          #5
          Re: Asus X550VX rev 2 and Vram type

          It's very strange, both use up1565p not in fixed mode (pin 6 is not to GND) , resistor divider is 10k (pr9312) and 11.8 k (pr9313)

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            #6
            Re: Asus X550VX rev 2 and Vram type

            Originally posted by jasko_jacker View Post
            ok
            thanks but not 1.35 (dual voltage as elpida) ?
            The dc/dc is a up1565p , which provides two (fixed ?) voltages, 1.5v and 1.8 so what I didn't understand about 1.35v ?
            The The up1565p is adjustable as well. In the X550VX boardview pin 6 is connected to a resistor divider

            https://pdf1.alldatasheet.com/datash...P1565PQKF.html

            Edit: i was looking at the boardview and datasheet,you posted before me .
            Last edited by SMDFlea; 05-09-2021, 11:38 AM.
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              #7
              Re: Asus X550VX rev 2 and Vram type

              vram voltage = 0.75(1+(11.8/10)) = 0.75(2.18) = 1.635 v
              With these resistors value, the output should be around 1.5V
              but the boardview (version ?) and my reading is 1.35 v , on the asus site I see a model upgrade (x550vxk).
              probably there is something that I do not understand but since the cards are identical also for revision I change the vram elpida with the samsung
              Last edited by jasko_jacker; 05-09-2021, 01:03 PM.

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                #8
                Re: Asus X550VX rev 2 and Vram type

                what are the resistor values on the donor board
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                  #9
                  Re: Asus X550VX rev 2 and Vram type

                  it's the same 10k and 12k with these values and using the formula on datasheet the result should be around 1.5v and not 1.35
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