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A dead router power supply was brought back to life

By on October 14, 2013

A lost German guy was standing near my shop asking for directions to a certain place. I approached the guy and nicely asked him if he needs any help. He smiled at me and asked where he can find a place when he can get his router fixed. I smiled back and said, follow me. Few seconds later, we were at my shop.  His name was Andreas.

I powered up the router and sure enough, the router did not power up for some reason. When I checked the output voltage of the power supply, it did not show any reading indication a dead power supply.

As always, there are no screws on this charge so I had to cut it open with a sharp knife. Once I opened it, this is what I saw.


A bulged capacitor was found in this power supply. As you can see in the photo, I had to take it out for replacement.

It was 10 microfarad capaitor 400 volts. As you can see there are two of them but one of the them was bulged, the other one was fine

I checked the power supply for any shown bad parts but could not find any. So I had to replace it to see if it works on not.


Once I replaced it with a new one, the power charger was brought back to life. Andreas was so happy to see it come to life. I powered up the router, connected it to my internet connection in my shop and everything worked just fine.

We became good friends. We sat in the shop and talked about so many things in life, politics, and economy in my country and his.

I was able to give him directions to a good technician (me) and got his power supply fixed. We spend great time talking. Mission accomplished.





This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment. Please give a support by clicking  on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.

By the way if you have any good repair article that you want me to publish in this blog please do contact me HERE.



  1. Br123

    October 14, 2013 at 9:10 pm

    The bulging is very subtle... I assume it was the cap in the lower right corner of the picture?

    • Waleed Rishmawi

      October 15, 2013 at 6:01 pm

      yea, I took it out before I took a photo of it.

  2. Robert

    October 15, 2013 at 5:32 am

    Thanks for the article, Waleed. Why didn't you go ahead and replace the other e-cap also since it will probably fail before long??

    • Waleed Rishmawi

      October 15, 2013 at 5:59 pm

      Robert: yea I should have but I did not since it checked fine.

  3. raymundo saura

    October 19, 2013 at 5:05 pm

    thanks for this i learning a lot thanks and GOD bless

    • Waleed Rishmawi

      October 23, 2013 at 5:16 pm

      Raymundo: I am glad you are learning from this. God bless you too.

  4. Humberto

    October 21, 2013 at 7:44 pm

    A very good article. Keep on doing it

    • Waleed Rishmawi

      October 23, 2013 at 5:17 pm

      Humberto: thanks. I will my friend. I will be going to the states for two months but I will resume writing these articles when I come home the end of the year. God bless you


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