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    #1

    Constant Rebooting with Toshiba L350 Laptop using Power Cable

    Hello

    I have recently purchased a Toshiba Satellite L350-203 PSLD8E-073008EN http://www.toshiba.co.uk/discontinue...lite-l350-203/ off ebay. It works fine when using the battery but when I remove the battery and run it from the mains adapter it constantly reboots after 3-5 mins of use. It is very anoying as I cannot install a fresh operating system unless I use the battery then I only have less than 2 hours of use. I was looking to use my laptop by using the mains power supply but this is not possible. I have disable reboot on windows errors so it shows a blue screen if there is a hardware error but no blue screen is shown it just reboots. I also loose the desktop sometimes if I try to change the power management settings and have to power off the laptop and start it again.

    I have been reading the forum and I have noticed that the NEC Tokin chip maybe at fault? Is this the case with this laptop?

    If it is the chip what whould be the best replacement for that chip? I have read there are a few choices. Which is the best and most reliable choice?

    As you can tell by my forum name I am a complete noob at laptops. I have never taken a laptop apart before. I am ok with desktop towers but never laptops. I would need to also purchase a soldering iron. Would a 30w soldering iron be ok?

    I have also read that it is difficult to remove the chip. I do not have a hot air gun. What would be the best aproach to removing the chip?

    Are there any good tutorials on doing this without hot air guns? I have looked on youtube and nearly all of the tutorial videos are not in english.

    Is it worth fixing this laptop or is it better to look for a different make of laptop and keep this one as a project?

    Thanks in advance for your help and my appologies for the many questions. Like I said I am new to all of this but I am willing to learn and have ago
    Last edited by noob2laptops-uk; 06-05-2015, 03:08 AM.
    Tags: None
    #2
    Re: Constant Rebooting with Toshiba L350 Laptop using Power Cable

    The NEC Tokin capacitor can be pried off the PCB without damaging the PCB because the solder used has a rather low peel strength. You need a prior understanding of how the capacitor is attached to the PCB.
    For the iron, I use a 936A clone with a K tip to solder on the replacement capacitors, not another NEC Tokin part.
    There is already a large thread on the topic. https://www.badcaps.net/forum/showthread.php?t=8991
    Tell us what you plan to do before making any moves.

    Comment

      #3
      Re: Constant Rebooting with Toshiba L350 Laptop using Power Cable

      Originally posted by rievax_60 View Post
      The NEC Tokin capacitor can be pried off the PCB without damaging the PCB because the solder used has a rather low peel strength. You need a prior understanding of how the capacitor is attached to the PCB.
      For the iron, I use a 936A clone with a K tip to solder on the replacement capacitors, not another NEC Tokin part.
      There is already a large thread on the topic. https://www.badcaps.net/forum/showthread.php?t=8991
      Tell us what you plan to do before making any moves.
      Thank you for your reply

      I have been reading through that post earlier and that is what made me think that it maybe the Tokin chip at fault. I am interested in 'having a go' at fixing it as it would be a learning curve. Ok it works on a battery but I wanted a laptop that worked on mains as I would be using it for longer periods that 2 hours.

      What would be the best thing to do? What would the best setup be as a replacement for the Tokin chip? How long would they last before the problems start again if I am able to resolve it?

      Thanks

      Comment

        #4
        Re: Constant Rebooting with Toshiba L350 Laptop using Power Cable

        There is a really big topic for this problem. Use 4x 330uF tantalum capacitors. You can find them on dead motherboards, they are small, rectangular and have "330" printed on them.

        It will last forever.
        Originally posted by PeteS in CA
        Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
        A working TV? How boring!

        Comment

          #5
          Re: Constant Rebooting with Toshiba L350 Laptop using Power Cable

          Originally posted by Th3_uN1Qu3 View Post
          There is a really big topic for this problem. Use 4x 330uF tantalum capacitors. You can find them on dead motherboards, they are small, rectangular and have "330" printed on them.

          It will last forever.

          Thank you for your reply.

          Would these be ok?

          http://uk.rs-online.com/web/p/alumin...tors/7269893P/

          Thanks to spleenharvester for the above link

          Comment

            #6
            Re: Constant Rebooting with Toshiba L350 Laptop using Power Cable

            I removed the NEC Tokin capacitor from a Satellite M200 today. I took some detailed snaps.
            The tool is a sharpened screwdriver, not razor sharp and with the corners being rounded slightly to reduce scratching.
            The tool needs to be inserted between the capacitor's ground or - plate and the PCB with a slight twisting action.
            After the bulk of the capacitor has been removed, its two + strips will be left attached to the PCB. Use the tool to lift an end from the solder then peel it off with your fingers. The solder is very brittle.
            Individually remove any metallic flakes from the PCB from when the capacitor broke up.
            Do not interfere with the dark gap between the ground and the + pad areas, indicated by the yellow arrows.
            Attached Files
            Last edited by rievax_60; 06-05-2015, 05:28 AM.

            Comment

              #7
              Re: Constant Rebooting with Toshiba L350 Laptop using Power Cable

              The capacitors you linked will work. Tantalum instead of aluminium would be a better idea though.
              Originally posted by PeteS in CA
              Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
              A working TV? How boring!

              Comment

                #8
                Re: Constant Rebooting with Toshiba L350 Laptop using Power Cable

                Thanks rievax for the detailed description and the pictures showing the removal of the Tokin Chip. Most appreciated

                Comment

                  #9
                  Re: Constant Rebooting with Toshiba L350 Laptop using Power Cable

                  Originally posted by Th3_uN1Qu3 View Post
                  The capacitors you linked will work. Tantalum instead of aluminium would be a better idea though.
                  Thanks for the reply. I will look for Tantalum thanks for the correction

                  Comment

                    #10
                    Re: Constant Rebooting with Toshiba L350 Laptop using Power Cable

                    hy just change the nec token withe 4 capacitors of 330 uf

                    Comment

                      #11
                      Re: Constant Rebooting with Toshiba L350 Laptop using Power Cable

                      Ok I have been doing a bit of searching for 330uF tantalum capacitors and found these:-

                      http://uk.rs-online.com/web/p/tantal...itors/7955806/

                      Capacitance 330uF
                      Depth 4.30mm
                      Dimensions 7.3 x 4.30 x 1.8mm
                      Electrolyte Type Solid
                      Equivalent Series Resistance 25mΩ
                      Height 1.8mm
                      Leakage Current 82.5 μA
                      Length 7.3mm
                      Maximum Operating Temperature +105°C
                      Minimum Operating Temperature -55°C
                      Mounting Type Surface Mount
                      Package/Case D2E
                      Series POSCAP TPE
                      Tolerance ±20%
                      Tolerance Minus -20%
                      Tolerance Plus +20%
                      Voltage 2.5 V dc

                      Would those be ok to use?

                      Also do I solder both sides of the capacitors to the board? Or just the + side?

                      Thanks in advance
                      Last edited by noob2laptops-uk; 06-05-2015, 08:24 PM.

                      Comment

                        #12
                        Re: Constant Rebooting with Toshiba L350 Laptop using Power Cable

                        I have never used capacitors with an ESR that high and I don't know what the upper limit is.
                        I hope some one can reply with more certainty.

                        Comment

                          #13
                          Re: Constant Rebooting with Toshiba L350 Laptop using Power Cable

                          The 15mΩ version would be a safer choice.
                          http://uk.rs-online.com/web/p/tantal...itors/7955815/

                          Comment

                            #14
                            Re: Constant Rebooting with Toshiba L350 Laptop using Power Cable

                            Originally posted by rievax_60 View Post
                            The 15mΩ version would be a safer choice.
                            http://uk.rs-online.com/web/p/tantal...itors/7955815/
                            Thank you Rievax

                            Comment

                              #15
                              Re: Constant Rebooting with Toshiba L350 Laptop using Power Cable

                              Originally posted by Th3_uN1Qu3 View Post
                              There is a really big topic for this problem. Use 4x 330uF tantalum capacitors. You can find them on dead motherboards, they are small, rectangular and have "330" printed on them.

                              It will last forever.
                              Just out of interest. How would I remove the 330uF tantalum capacitors from the old boards? Would they need to be old laptop boards? Would I need any special equipment or would a standard soldering iron do the job. Also would they be the correct ESR?

                              Thanks

                              Comment

                                #16
                                Re: Constant Rebooting with Toshiba L350 Laptop using Power Cable

                                just a normal iron will do with a 1mm tip +/- 0.2mm.

                                400c and the job needs to be surgical fast so you won`t heat up the cap.

                                prepare a tweezer; put some solder in one side heat it up lift it up until it does not touch the solder and the pad then go on the other side.

                                use you dmm in capacity mode after the cap it cool down (or ohm set) because the value when its worm its false.
                                Just cook it! It's already broken.

                                Comment

                                  #17
                                  Re: Constant Rebooting with Toshiba L350 Laptop using Power Cable

                                  I remove them with my hot air station. If you have a scrap board that you do not intend on repairing, you can also use a mini torch to heat the board from the bottom under the component you want to remove and use tweezers to pull it off.
                                  Originally posted by PeteS in CA
                                  Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                                  A working TV? How boring!

                                  Comment

                                    #18
                                    Re: Constant Rebooting with Toshiba L350 Laptop using Power Cable

                                    Thanks dj_ricoh and Th3_uN1Qu3

                                    Comment

                                      #19
                                      Re: Constant Rebooting with Toshiba L350 Laptop using Power Cable

                                      If I bought a soldering iron what would be the best? A 30w or 40w? I will be using it for soldering the caps etc.

                                      Thanks in advance

                                      Comment

                                        #20
                                        Re: Constant Rebooting with Toshiba L350 Laptop using Power Cable

                                        bigger is better.

                                        Comment

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