Toshiba A300 sudden shotdown/restart

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  • predator0357
    Senior Member
    • Jul 2014
    • 159
    • Israel

    #1

    Toshiba A300 sudden shotdown/restart

    Hi
    My laptop is shouting-down suddenly even if i remove the battery, but with the battery its working great. so i changed the PSU n still, so what should i do?
    Last edited by predator0357; 11-09-2015, 02:39 PM.
  • Djosla
    Badcaps Veteran
    • Dec 2012
    • 246
    • Montenegro

    #2
    Re: Toshiba A300 sudden shotdown/restart

    It is nec tokin capacitor problem in cpu vrm circuit...

    https://www.badcaps.net/forum/showth...ight=nec+tokin

    Comment

    • predator0357
      Senior Member
      • Jul 2014
      • 159
      • Israel

      #3
      Re: Toshiba A300 sudden shotdown/restart

      Originally posted by Djosla
      It is nec tokin capacitor problem in cpu vrm circuit...

      https://www.badcaps.net/forum/showth...ight=nec+tokin
      tnx for the help

      Look my dad have the same prob but with samsung, but with him its shoutingdown even with the battery or without it, so what do u think?

      Comment

      • Djosla
        Badcaps Veteran
        • Dec 2012
        • 246
        • Montenegro

        #4
        Re: Toshiba A300 sudden shotdown/restart

        i dont know...could be a lot of things...check for dust in cooler area...it might be temperature based shutdown...

        Comment

        • highpulse
          i hate HP
          • May 2013
          • 1488
          • portugal

          #5
          Re: Toshiba A300 sudden shotdown/restart

          attention also some samsung models do have nec and make this problems to occur,

          Comment

          • FShahid
            Senior Member
            • Nov 2012
            • 57
            • United Kingdom

            #6
            Re: Toshiba A300 sudden shotdown/restart

            It is definately NEC Tokin that needs replacing. Had same issue with almost all L300 A300 Intel models I have seen. There is also a topic that explains how to do replacing it with solid caps instead if you don't have exact part.

            Comment

            • predator0357
              Senior Member
              • Jul 2014
              • 159
              • Israel

              #7
              Re: Toshiba A300 sudden shotdown/restart

              Originally posted by Djosla
              i dont know...could be a lot of things...check for dust in cooler area...it might be temperature based shutdown...
              I did the same tests like i did to my TOSHIBA (with or without battery and with or without PSU). so if its not TEMP prob what could it be?

              Comment

              • predator0357
                Senior Member
                • Jul 2014
                • 159
                • Israel

                #8
                Re: Toshiba A300 sudden shotdown/restart

                Originally posted by FShahid
                It is definately NEC Tokin that needs replacing. Had same issue with almost all L300 A300 Intel models I have seen. There is also a topic that explains how to do replacing it with solid caps instead if you don't have exact part.
                The topic u talking about is what Djosla gave me?

                Comment

                • predator0357
                  Senior Member
                  • Jul 2014
                  • 159
                  • Israel

                  #9
                  Re: Toshiba A300 sudden shotdown/restart

                  Originally posted by highpulse
                  attention also some samsung models do have nec and make this problems to occur,
                  Do u have any idea what could it be? besides NEC caps.

                  Comment

                  • FShahid
                    Senior Member
                    • Nov 2012
                    • 57
                    • United Kingdom

                    #10
                    Re: Toshiba A300 sudden shotdown/restart

                    Various reasons depending on usual faults that could happen in particular model.
                    Like in the older HP DV5 (the silver one) one of the reason of sudden shutdown after running few seconds was due to a shorted mosfet.
                    But as for A300/L300, unless some physical damage, the common issue is NEC TOKIN. The common symptom is that when using charger it is unstable and crashes to blue screen, freezes when left idle, or reboots at random locations (the symptom keeps changing between these three on same laptop)
                    Last edited by FShahid; 11-10-2015, 09:38 AM.

                    Comment

                    • predator0357
                      Senior Member
                      • Jul 2014
                      • 159
                      • Israel

                      #11
                      Re: Toshiba A300 sudden shotdown/restart

                      Originally posted by FShahid
                      Various reasons depending on usual faults that could happen in particular model.
                      Like in the older HP DV5 (the silver one) one of the reason of sudden shutdown after running few seconds was due to a shorted mosfet.
                      But as for A300/L300, unless some physical damage, the common issue is NEC TOKIN. The common symptom is that when using charger it is unstable and crashes to blue screen, freezes when left idle, or reboots at random locations (the symptom keeps changing between these three on same laptop)
                      so the best way is to change TOKIN in the samsung and see?

                      Comment

                      • predator0357
                        Senior Member
                        • Jul 2014
                        • 159
                        • Israel

                        #12
                        Re: Toshiba A300 sudden shotdown/restart

                        hello everyone
                        Today i got time to replace my toshiba A300 nec\tokin cap with 4 330uF 2.5V.
                        I solder the + of the cap to the outer line and the - to the inner line and i putted back every thing and...... BOOOOOM NOTHING HAPPENED.
                        At first it did power up but without display and after a min i powered off the laptop and now it wont power on and with no LEDS
                        WHAT DID I DO WRONG!!!!!!!

                        P.S
                        i 4got to take pics. sorry.

                        Comment

                        • Djosla
                          Badcaps Veteran
                          • Dec 2012
                          • 246
                          • Montenegro

                          #13
                          Re: Toshiba A300 sudden shotdown/restart

                          Originally posted by predator0357
                          hello everyone
                          Today i got time to replace my toshiba A300 nec\tokin cap with 4 330uF 2.5V.
                          I solder the + of the cap to the outer line and the - to the inner line and i putted back every thing and...... BOOOOOM NOTHING HAPPENED.
                          At first it did power up but without display and after a min i powered off the laptop and now it wont power on and with no LEDS
                          WHAT DID I DO WRONG!!!!!!!

                          P.S
                          i 4got to take pics. sorry.
                          post pictures of your work...

                          Comment

                          • predator0357
                            Senior Member
                            • Jul 2014
                            • 159
                            • Israel

                            #14
                            Re: Toshiba A300 sudden shotdown/restart

                            Originally posted by Djosla
                            post pictures of your work...
                            If i shorten one of the caps, there is hope for me?

                            Comment

                            • predator0357
                              Senior Member
                              • Jul 2014
                              • 159
                              • Israel

                              #15
                              Re: Toshiba A300 sudden shotdown/restart

                              Here some pics
                              And i saw that i shorten the second down left cap😢 and i got it out and checked it ohm and diod mode and nothing is showing, checked ohm on MB and the inner line shows 0.4ohm and outer 6.8ohm. So there is hope for me?
                              Attached Files

                              Comment

                              • dmartins
                                David M
                                • Apr 2014
                                • 197
                                • Lisbon

                                #16
                                Re: Toshiba A300 sudden shotdown/restart

                                Predator can be a bad cap ?
                                Try to change the caps again...

                                Comment

                                • predator0357
                                  Senior Member
                                  • Jul 2014
                                  • 159
                                  • Israel

                                  #17
                                  Re: Toshiba A300 sudden shotdown/restart

                                  Originally posted by dmartins
                                  Predator can be a bad cap ?
                                  Try to change the caps again...
                                  but i probably shorten the caps. so still i need to try another caps?

                                  Comment

                                  • dmartins
                                    David M
                                    • Apr 2014
                                    • 197
                                    • Lisbon

                                    #18
                                    Re: Toshiba A300 sudden shotdown/restart

                                    If it was me I tried with other caps.

                                    Comment

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