ICI PC Power Supply repaired

 

 

 

 

 

 

 

The Switch Mode Power Supply (SMPS) of this brand is ICI and model: ICI-350W. It was brought to me and the complaint was it was connected into the AC mains of 220 volts with the rear voltage selector in 115 volts position. Of course it was fully dead.

The SMPS was disarmed; a piece of cake, only four screws in the upper cover, and you can see the whole power supply board.

First thing checked was the fuse, and it was opened. But before substitute the fuse the active components in the corresponding circuit were tested on: Diode Bridge, both Oscillator Transistors, and some other small signal Diodes and Transistors from the primary side.

Till here all the components were fine. So the fuse was replaced and when the SMPS was connected into the AC mains, the fuse blown again.

The primary side of the SMPS was re-checked and look what I found.

As you can see in the photo above one of the big filter capacitors (680µF/200 volts) of the primary side was shorted when I tested it with the Digital Multimeter. Since I do not have the spare part, I have used 470uf 200 volt cap as replacement.

The secondary side components were checked also and found another e-cap (1000µF/10 volts) with high ESR value. It was tested with my Blue ESR meter.

It was substituted with a similar cap value. I then powered On the power supply and checked on the voltage readings.

All the voltage values were fine, so the SMPS was fully assembled and put into the PC cabinet. When the PC was turned on, it really worked fine.

Note: the rear voltage selector was put into 230 volts position, because this PC was going to work in 220 volts.

If you want to know more about SMPS repair you can check out this link.

 

 

 

 

 

 

 

 

 

 

This article was prepared for you by Humberto Rodriguez, one of our ‘Master Authors’ from Cuba.

Please give a support by clicking  on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.

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Note: You may check his previous repair article in the below link:

https://www.jestineyong.com/my-home-pc-repaired/

 

15 Comments

1. 

   Albert

   August 11, 2015 at 4:54 pm

   Another SMPS repair, nice going Humberto! Thanks for Sharing.

   Likes(3)Dislikes(0)

   Reply
   • 

     humberto

     August 12, 2015 at 6:23 am

     thanks Albert

     Likes(1)Dislikes(0)

     Reply
2. 

   Robert Calk

   August 11, 2015 at 11:39 pm

   Good job, Humberto.

   Likes(1)Dislikes(0)

   Reply
   • 

     Humberto

     August 13, 2015 at 1:30 am

     Thanks Robert, I never thought a big filter could be shorted for selecting bad the voltage-IN

     Likes(2)Dislikes(0)

     Reply
3. 

   Henrique Jorge Guimarães Ulbrich - Brazil

   August 12, 2015 at 12:08 am

   Thank you for the sharing, Humberto. Once again, I highlight the bad quality of the e-caps nowadays, which did not happen before.

   Likes(2)Dislikes(0)

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   • 

     Humberto

     August 13, 2015 at 1:32 am

     Yes Henrique, most of the electronic components have bad quality nowadays.

     Likes(1)Dislikes(0)

     Reply
4. 

   mahmoud

   August 12, 2015 at 5:31 am

   thanks Humberto it is very useful for me.

   Likes(0)Dislikes(0)

   Reply
   • 

     Humberto

     August 13, 2015 at 1:33 am

     Thanks mahmoud. You are welcome.

     Likes(0)Dislikes(0)

     Reply
5. 

   Gurpreet

   August 12, 2015 at 2:23 pm

   Hello Mr. Rodriguez

   Good job and thanks for sharing this with us.

   Looks good.

   Bye

   Likes(0)Dislikes(0)

   Reply
   • 

     Humberto

     August 13, 2015 at 1:34 am

     Thanks to you too Gurpreet

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     Reply
6. 

   Yogesh Panchal

   August 13, 2015 at 12:05 am

   Humberto, Congratulations! for the Fix.

   Likes(1)Dislikes(0)

   Reply
7. 

   Chris

   August 13, 2015 at 2:25 pm

   Thank you Humberto, I like to read your articles. They are so well explaned and ingormative. Nice resource for all of as who do repairing this kind of electronics.
   Good work and nice job done.

   Likes(1)Dislikes(0)

   Reply
8. 

   Albert Hoekman, Holland

   August 13, 2015 at 10:59 pm

   Nice job Humberto. It is always hard to find faulty parts in a SMPS, especially in a small one when te parts are mounted very close together and sealed with a lot of silicone sealant.
   Keep publishing your nice articles!

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   • 

     Humberto

     August 14, 2015 at 8:31 pm

     Thanks Albert.

     Likes(1)Dislikes(0)

     Reply
9. 

   mahienn

   February 11, 2016 at 7:00 am

   good job sir

   keep it up

   i thought that all e caps are OK until they are bulged

   can i use 470v 330uf ecap as substitute of 200v 330uf?

   thanx in advance

   Likes(0)Dislikes(0)

   Reply

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