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How To Replace NEC Tokin High Speed Decoupling Capacitor In Toshiba Laptop

By on February 6, 2015









The most common problem in Toshiba laptop are blue screen, won’t work with adapter, won’t install OS, white screen , CPU is overheating and the solution  is to replace the NEC Tokin  high speed decoupling capacitor.

Below are the steps to replace the capacitors:

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This article was prepared for you by Mabrouk Mohammed Ali from Tunisia. He is working at a training center here and an expert at Fixya Website.

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  1. Mervin

    February 6, 2015 at 1:01 pm

    Nice job!

  2. Yogesh Panchal

    February 6, 2015 at 2:39 pm

    Good job , Sir did you replaced the new capacitors or just rework???
    thanks for sharing.

  3. Frank Webster

    February 6, 2015 at 8:27 pm

    These have been the best I could find anywhere to help us repair all of the associated small electronics brought in to us

  4. Robert Calk

    February 6, 2015 at 9:31 pm

    Thanks for the tip Mabrouk.

  5. Andre Gopee

    February 6, 2015 at 11:22 pm

    Interesting, I have one of these Laptop and it gives the same problem... I couldn't fine the problem and I shelved it for a while now. I will check on these Caps and see if it works. Nice job and keep up the good work.

  6. Humberto

    February 7, 2015 at 12:17 am

    Thanks Mabrouk Mohammed Ali, this is a commom faulty in Toshiba laptops.

  7. Amir Mukhtar

    February 7, 2015 at 1:50 am

    Thanks you Mr. Mabrouk Mohammed Ali to sharing Toshiba Laptop Common Problem Solution. I am very greatfull to you .

    Keep Sharing your Expertise Articles to Learn ERG Members.

    Thanks you Again
    Amir Mukhtar Ashrafi

  8. moshe

    February 7, 2015 at 8:15 am

    very interesting..thanks for sharing. Does the cover covering the 2 capacitors simply flip off?

    • mabrouk

      February 7, 2015 at 6:02 pm

      use adesive double sided tape to attach the cover to the 4 cap

  9. peter

    February 7, 2015 at 11:40 am

    I could not get any sense of scale looking at the pics.
    How big is the cap you replaced?
    What sort of solder paste (not many of us amateurs have it on hand) & what tool to manage the solder process.
    Finally how to check before reassembly.

    • mabrouk

      February 9, 2015 at 7:02 pm

      simply use a 1.5mm solder wire and soldering iron, you can learn more about soldering techniques:

  10. moses

    February 7, 2015 at 4:04 pm

    Love ur repair work ... Can i speed up my laptop compac nc6230 by any repair soldering work?

    • mabrouk

      February 9, 2015 at 7:08 pm

      soldering work can't speed up your laptop, here i'm showing a problem about power supply of vcc_core, but you can upgrage your memory to 2GB one module per slot and use Intel Pentium M processor 780* (2.26-GHz, 533-MHz FSB, 2-MB L2 cache)

  11. Tito

    February 7, 2015 at 4:22 pm

    Thanks for sharing Mabrouk but I have the same question asked by Moshe

  12. Zigurds

    February 7, 2015 at 4:22 pm

    Very good topic, great solution.

  13. Momchil

    February 9, 2015 at 12:33 am

    THERE IS A SOFTWARE SOLUTION!!! I had a BSOD problem with an old notebook Toshiba Satellite series(probably L300 or something like that) but the BSOD was only when it was working with adapter (and with the battery only there were no problems). I went in device manager while only on battery and disabled the CPU (processor). What it does is not really disabling the CPU but disabling the real-time dynamic change of cpu frequency which indeed was causing the problems. After the restart the notebook was working with the adaptor. The only drawback to this solution is the CPU will work only at MAX FREQUENCY which could cause overheat if there are other problems like dust, damaged fan or thermal module.

  14. shahid ahmad

    February 9, 2015 at 4:58 am


  15. Ravi

    February 9, 2015 at 9:21 pm

    Dear sir
    Thanks for sending emails.
    I have accer laptop model: 5746 sound is not clear hissing sound is coming pls guide me

    • Fernando Frias

      February 12, 2015 at 9:02 pm

      Check first the software in default audio by your laptop
      Go to Start menu
      Control Panel
      Find the Sound icon
      then Click it to the Icon
      and there is pop up settings of the sound
      you can see if there is Speaker default or Realtek Digital output
      if the speaker is by default double click
      the Speaker Properties will pop up
      unthick the disable the sounds effect
      and click Ok then to listen the audio of your laptop Play some audio

  16. jojo reyes

    February 19, 2015 at 5:27 pm

    good day sir .i have a laptop toshiba old model seies..satellite L20.model PSL20L-00x011.Can i upgrade this and how many gig can i install.? What is the safe parts and model that can i use that will not damge my whole unit.It is only 1.73GHz ,0.99 of pentuim (R)M,Thanks a lot for sharing your an amateur technician here in the Phillipines.

  17. jamal sekou

    March 14, 2015 at 12:24 am

    I am Mr. jamal . I reparateur electronicien in Morocco I have read almost all your books on electronics and wish to have a plasma tv repair of training and tablets thank you.

    • Jestine Yong

      March 14, 2015 at 10:51 am

      Hi Jamal,

      You can try Damon's ebook on plasma tv repair at . As for tablet sorry no info on such ebook.


      • Robert Calk

        March 14, 2015 at 11:30 am

        Damons book is excellent.

  18. Edward

    June 2, 2015 at 8:32 am

    My son has a Toshiba L305 s5937 which had all the problems outlined and remained that way for more than 8 months; then I replaced the capacitors with new ones which I ordered online and now the laptop is working great. This shows that the "nec\tokin" capacitors were actually the problem and this was after I changed, adaptor, power jack, clock battery and tested the main board several times.

  19. Jeremy

    June 23, 2016 at 1:44 am

    why should one scratch of the green vanish between the plates?? is that necessary+?
    I am just about to, please advise me!!!


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