Acer Aspire 5738G continuously restarting

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  • sopik78
    Badcaps Veteran
    • Nov 2013
    • 517
    • Czech Republic

    #1

    Acer Aspire 5738G continuously restarting

    I have laptop Acer Aspire 5738G to fix which continuously restarts in about 3-4s after AC plug in. Flashed BIOS including change SPI eeprom, changed KBC, changed SB Intel.

    Can anyone suggest what I should check else? Thanks for helping.

    Board JV50-MV DDR3 M96 Ati

    Anybody could share schematic?
    Last edited by sopik78; 08-15-2015, 09:34 AM.
  • bicalov
    Badcaps Veteran
    • Nov 2014
    • 294
    • Netherlands

    #2
    Re: Acer Aspire 5738G continuously restarting

    herewith
    Attached Files

    Comment

    • sopik78
      Badcaps Veteran
      • Nov 2013
      • 517
      • Czech Republic

      #3
      Re: Acer Aspire 5738G continuously restarting

      thanks, I have this one, it's for nvidia GPU, my laptop has ATI M96.

      Comment

      • bicalov
        Badcaps Veteran
        • Nov 2014
        • 294
        • Netherlands

        #4
        Re: Acer Aspire 5738G continuously restarting

        This is also a JV50, but different machine. Maybe it can help
        Attached Files

        Comment

        • sopik78
          Badcaps Veteran
          • Nov 2013
          • 517
          • Czech Republic

          #5
          Re: Acer Aspire 5738G continuously restarting

          Thank you, but it's a different board with Intel Sandy Bridge

          I tried to change CPU, RAM as well with no succes.
          Reflowed all power voltage regulators, still restarting

          Comment

          • dj_ricoh
            Badcaps Legend
            • Jan 2013
            • 2073
            • uk

            #6
            Re: Acer Aspire 5738G continuously restarting

            Originally posted by sopik78
            I have laptop Acer Aspire 5738G to fix which continuously restarts in about 3-4s after AC plug in. Flashed BIOS including change SPI eeprom, changed KBC, changed SB Intel.

            Can anyone suggest what I should check else? Thanks for helping.

            Board JV50-MV DDR3 M96 Ati

            Anybody could share schematic?
            if you charge the battery does it work normal?
            Just cook it! It's already broken.

            Comment

            • sopik78
              Badcaps Veteran
              • Nov 2013
              • 517
              • Czech Republic

              #7
              Re: Acer Aspire 5738G continuously restarting

              charging works, same behavior on AC or battery

              Comment

              • dj_ricoh
                Badcaps Legend
                • Jan 2013
                • 2073
                • uk

                #8
                Re: Acer Aspire 5738G continuously restarting

                ok!
                i got a nvidia model.

                if you want i can take it out and work with you if you want?

                i know you got ati but the buck regulators maybe are the same and voltage on coils
                Just cook it! It's already broken.

                Comment

                • sopik78
                  Badcaps Veteran
                  • Nov 2013
                  • 517
                  • Czech Republic

                  #9
                  Re: Acer Aspire 5738G continuously restarting

                  it would be great!

                  what's your idea how will we do that?

                  Comment

                  • dj_ricoh
                    Badcaps Legend
                    • Jan 2013
                    • 2073
                    • uk

                    #10
                    Re: Acer Aspire 5738G continuously restarting

                    can you take some high res photos?
                    Just cook it! It's already broken.

                    Comment

                    • sopik78
                      Badcaps Veteran
                      • Nov 2013
                      • 517
                      • Czech Republic

                      #11
                      Re: Acer Aspire 5738G continuously restarting

                      ok, I'll do it tomorrow. what do you wanna see exactly? all board both sides or should I take a focus on some components?

                      Comment

                      • dj_ricoh
                        Badcaps Legend
                        • Jan 2013
                        • 2073
                        • uk

                        #12
                        Re: Acer Aspire 5738G continuously restarting

                        I'll make a few pic of my board and will see if the layout looks the same.

                        Later ofc im at work and i got the.board at.home outside already.
                        Just cook it! It's already broken.

                        Comment

                        • age80
                          Senior Member
                          • Jun 2013
                          • 55
                          • Greece

                          #13
                          Re: Acer Aspire 5738G continuously restarting

                          Is this your board?

                          https://www.dropbox.com/s/alnnbzj66t...50-MV.rar?dl=0

                          Comment

                          • sopik78
                            Badcaps Veteran
                            • Nov 2013
                            • 517
                            • Czech Republic

                            #14
                            Re: Acer Aspire 5738G continuously restarting

                            yes, that's exactly the same board

                            Comment

                            • dj_ricoh
                              Badcaps Legend
                              • Jan 2013
                              • 2073
                              • uk

                              #15
                              Re: Acer Aspire 5738G continuously restarting

                              same board! only nvidia chip.

                              let`s start this.

                              1st coils! the pic with cpu and gpu

                              voltages on them. i`ll take the voltages and write them here.
                              Just cook it! It's already broken.

                              Comment

                              • dj_ricoh
                                Badcaps Legend
                                • Jan 2013
                                • 2073
                                • uk

                                #16
                                Re: Acer Aspire 5738G continuously restarting

                                its not 100% the same
                                L19 its a bit out of place!

                                L19=24-19v --> 1.33v
                                u41= pin1,2,3 -->19-23v; pin 4 25-26v ; pin 5,6,7,8 19.41v
                                u40= pin1,2,3 -->7-20mV; pin 4 5.31v(see pic)

                                L26 = 19-24v -->1.6v
                                L25 = 19-24v -->1.16v

                                U39,U35 like U41
                                U38,U36 like U40
                                Attached Files
                                Last edited by dj_ricoh; 08-17-2015, 01:22 PM.
                                Just cook it! It's already broken.

                                Comment

                                • dj_ricoh
                                  Badcaps Legend
                                  • Jan 2013
                                  • 2073
                                  • uk

                                  #17
                                  Re: Acer Aspire 5738G continuously restarting

                                  your board its brown under the GPU!
                                  did you consider you got a problem there? even burn layer in PCB or bad chip?
                                  Just cook it! It's already broken.

                                  Comment

                                  • dj_ricoh
                                    Badcaps Legend
                                    • Jan 2013
                                    • 2073
                                    • uk

                                    #18
                                    Re: Acer Aspire 5738G continuously restarting

                                    did some measurements.

                                    i`ll do more !

                                    it will be nice to KBC
                                    Attached Files
                                    Last edited by dj_ricoh; 08-17-2015, 01:52 PM.
                                    Just cook it! It's already broken.

                                    Comment

                                    • sopik78
                                      Badcaps Veteran
                                      • Nov 2013
                                      • 517
                                      • Czech Republic

                                      #19
                                      Re: Acer Aspire 5738G continuously restarting

                                      dj_ricoh: I'm very sorry but I'm on my very last minute vacation which I didn't expect two days ago. I will work on that piece of something next week.
                                      I very appreciate your help and sorry if I got you busy

                                      I will do that measurements when I will get back

                                      Comment

                                      • dj_ricoh
                                        Badcaps Legend
                                        • Jan 2013
                                        • 2073
                                        • uk

                                        #20
                                        Re: Acer Aspire 5738G continuously restarting

                                        Originally posted by sopik78
                                        dj_ricoh: I'm very sorry but I'm on my very last minute vacation which I didn't expect two days ago. I will work on that piece of something next week.
                                        I very appreciate your help and sorry if I got you busy

                                        I will do that measurements when I will get back
                                        have fun mate!
                                        Just cook it! It's already broken.

                                        Comment

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