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    #1

    acer 8930g no post

    Hi everyone

    i have 3 motherboards acer 8930g with the same symptom,

    they power on but there is no display on the screen, internal or external

    i have replaced the graphics card, cpu, ram and cmos battery,

    i am testing the boards naked on the bench

    the part number is 8930G 6050A2207701-MB-A02 and i have downloaded the

    schematic which can be found here

    https://cdn.badcaps-static.com/pdfs/...e16bb74757.pdf


    Now what i have seen is that the mxm connector is missing some voltages

    (5V in pin 8 which is the power for the card i believe), i tried to give it power

    bridging with a capacitor and now the card is getting warmer but still no

    display

    any help to pinpoint the fault would be highly appreciated,

    regards
    Tags: None
    #2
    Re: acer 8930g no post

    Did you replace by all 3 the gpu with new one and no display. cause that look like NB problem to me.
    The Night Drop Down, I Will Keep Try Until..., You Never know.
    Dushi Kòrsou, Nos Tei.

    Comment

      #3
      Re: acer 8930g no post

      yes i have tried on all 3 of them a working GPU(9600GT) with the same result,

      i have tried with a multimeter on the NB and it does not look shorted, i have also tried

      a mild reflow using an infrared rework station but that didn't change anything. Yesterday i also tried to flash it with a

      usb using the crisis procedure and the flash completed and the laptop shutdown (i know

      the update worked because i could see the light on the usb drive flashing).But still the

      laptop does not POST. Googling i read about the same problem due to a faulty voltage

      regulator but nothing specific so that i test it
      Last edited by Am0rPHiA; 05-03-2015, 07:56 AM.

      Comment

        #4
        Re: acer 8930g no post

        Originally posted by Am0rPHiA View Post
        Hi everyone

        i have 3 motherboards acer 8930g with the same symptom,

        they power on but there is no display on the screen, internal or external

        i have replaced the graphics card, cpu, ram and cmos battery,

        i am testing the boards naked on the bench

        the part number is 8930G 6050A2207701-MB-A02 and i have downloaded the

        schematic which can be found here

        https://cdn.badcaps-static.com/pdfs/...e16bb74757.pdf


        Now what i have seen is that the mxm connector is missing some voltages

        (5V in pin 8 which is the power for the card i believe), i tried to give it power

        bridging with a capacitor and now the card is getting warmer but still no

        display

        any help to pinpoint the fault would be highly appreciated,

        regards
        On which pages you missing the 5V in Pin 8, and maybe you have to reflash the bios with a programmer instead of updating.
        The Night Drop Down, I Will Keep Try Until..., You Never know.
        Dushi Kòrsou, Nos Tei.

        Comment

          #5
          Re: acer 8930g no post

          on page 28 its the MXM connector on the left and i see that pins 16 and 18 should have 5V

          (PWR_GOOD_3) when the machine is powered on. But powered on i don't see 5V there,

          i am not sure if i am reading this correctly so take in mind i may be wrong.

          Also i should mention that all 3 boards power on immediately when i plug in the ac

          adapter, i think the fault here is common on these boards.

          I don't have a bios programmer so my only option is to either order a new one or

          remove one from a working board (which i don't have).

          I will update with the results

          Comment

            #6
            Re: acer 8930g no post

            For me it was the tantalum capacitor C21. Replayed it with 4x330uF SMD and i got picture

            Comment

              #7
              Re: acer 8930g no post

              I agree to Lord, you have to check cpu vcore, it should be more than 1v to get display, try to replace with 4 capx330u

              Comment

                #8
                Re: acer 8930g no post

                same problem here!

                I tried 4x330uF and various cards but this one just powers on and no image. It seems to send some signal to the external monitor but no image.

                cpu gets warm - all other voltages present, too.

                tried other RAM & CPU.

                what do you guys think? Also is there a good BIOS dump?

                br,
                george

                Comment

                  #9
                  Re: acer 8930g no post

                  backup your old bios ans try this/

                  MOD EDIT: https://www.badcaps.net/forum/troubl...ire-8930g-bios

                  Comment

                    #10
                    Re: acer 8930g no post

                    Originally posted by polytek View Post
                    backup your old bios ans try this/
                    thank you polytek - I had to return this laptop back to the customer but asked him to bring it back at some point - I already downloaded and saved your file.

                    thank you again.

                    george

                    Comment

                      #11
                      Originally posted by polytek View Post
                      backup your old bios ans try this/
                      THX Bro, working!!!

                      Comment

                        #12
                        Re: acer 8930g no post

                        works for me too, thanks

                        Comment

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