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Acer ES1-571 Winstron no display

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    Acer ES1-571 Winstron no display

    Hello all,

    I have an ES1-571 here with no display, hdmi out or boot.
    Mobo = Wistron Domino_BH

    When pressing the power button the LED, fan and backlight turn on.
    Fan behaves as it would in normal situation.

    All power stages seem good; resistor for internal GPU enable is there.

    Have tried several cleaned bios versions online and later cleaned the original myself but did not make any difference.

    Any suggestions?

    Schematic here: https://www.badcaps.net/forum/attach...5&d=1552137609

    #2
    Re: Acer ES1-571 Winstron no display

    A) Detailed visual inspection fur burned components

    B) CapsLock test with external keyboard
    FairRepair on YouTube

    Comment


      #3
      Re: Acer ES1-571 Winstron no display

      Thanks for your message!

      A: Visual inspection: I have inspected it again and all looks in great state.

      B: CapsLock test: No response at all (there is power on USB ports).

      Any other suggestions?

      Comment


        #4
        Re: Acer ES1-571 Winstron no display

        The issue seems to be similar to: https://www.badcaps.net/forum/showthread.php?p=886122#7
        and I have asked the author of that topic @DeniS182 if he ever managed to resolve his problem.

        Since most has been ruled out I suspect it's the processor. I have ordered one of those PCIE debug cards as a 'last resort'; in the hope it will still find something

        Comment


          #5
          Re: Acer ES1-571 Winstron no display

          Fan and backlight turn on,is it screen back light?

          A picture of it would have help.

          Comment


            #6
            Re: Acer ES1-571 Winstron no display

            Originally posted by Udemzy View Post
            Fan and backlight turn on,is it screen back light?

            A picture of it would have help.
            There is not really anything to see; the screen remains black it's just the black with the backlights powered. I mentioned this to indicate (also confirmed it by measuring) that all the power to the display itself is correct.

            The fan turns on for a few seconds and then turns off; once in a while it spins up when needed / as it would do in a normal working situation.

            Comment


              #7
              Re: Acer ES1-571 Winstron no display

              Anyone any more suggestions what to check?

              Comment


                #8
                Re: Acer ES1-571 Winstron no display

                Remove the memory stick and check if the logic board offers a POST beep or LED blink code due to the missing RAM.

                Comment


                  #9
                  Re: Acer ES1-571 Winstron no display

                  Already tried but there was no indication of any difference; on this MB there is no buzzer nor LED unfortionately.

                  I hope is there will be anything useful trough the LPC interface but the connector is unpopulated and I don't have any suitable connector or ribbon cable to solder to it :/

                  Comment


                    #10
                    Re: Acer ES1-571 Winstron no display

                    if you have a spare memory that is good try to swap it.
                    Never stop LEARNING because life never stops TEACHING!

                    Comment


                      #11
                      Re: Acer ES1-571 Winstron no display

                      i'm having the same issue with this motherboard, all power rails are present,
                      it turns on but no display.
                      PLT_RST# 0V
                      DRAMRST# is pulled low to 0.128V.

                      Does it mean there is a CPU fault?
                      Attached Files
                      Last edited by Ariu; 03-29-2023, 09:03 AM.

                      Comment


                        #12
                        Re: Acer ES1-571 Winstron no display

                        Do you have any mesurements?

                        Comment


                          #13
                          Re: Acer ES1-571 Winstron no display

                          As I already mentioned, all power Rails are available, the Problem is PLTRST# 0V
                          DRAMRST# 0.128V

                          I muss focus first able on DRAMRST# Signal that is pulled low but I am still confused...

                          Comment

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