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Bridge Rectifier Found Open In IBall Computer SMPS

By on August 15, 2020
iball atx power supply repair

MODEL AND MAKE: iBall ATX Switching Power Supply Model LPE223-400


atx power supply fix

TROUBLE SHOOTING AND RECTIFICATION DONE: Opened and cleaned the SMPS, which had collected a lot of dust, as expected. Found the fuse, which was just a thin wire connected on the solder side, was intact. So applied power and looked for DC supply on the primary. This was missing.

Disconnected and checked the bridge rectifier with analogue Multimeter and found it to be open. As I had no stock of equivalent type of bridge rectifier, I used a round one and fixed it in its place. Did dry solder patch up. Checked ESR of capacitors and found these to be ok. Applied power and found it to be working very well, when tested with an ATX Power supply tester. I allowed it to work for some time before fitting it back. Mission accomplished and satisfaction got added!


bad capacitor in atx power supply

bad capacitor in atx power supplies

atx power supply tester

bridge rectifier open circuit

This article was prepared for you by Parasuraman Subramanian from India. He is 70 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.

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You may check on his previous repair article below:



  1. Albert van Bemmelen

    August 15, 2020 at 7:17 pm

    No bridge (-rectifier) too far for Parasuraman S!

    • Parasuraman S

      August 15, 2020 at 10:59 pm

      Ha! Ha! Many thanks!

  2. Yogesh Panchal

    August 15, 2020 at 10:25 pm

    well done! Sir

    • Parasuraman S

      August 16, 2020 at 4:27 pm

      Many thanks!

  3. Henrique J. G. Ulbrich

    August 16, 2020 at 4:30 am

    Thanks for sharing. This time an easy repair. Is the pinout of the original flat bridge rectifier the same as the rounded one?

    • Parasuraman S

      August 16, 2020 at 4:28 pm

      It is always standard. It will be marked on it.

  4. Waleed Rishmawi

    August 17, 2020 at 6:16 pm

    I am working on an power supply like that. so I hope the issue is repairable. thanks for sharing

    • Parasuraman S

      August 17, 2020 at 11:17 pm

      Many thanks! Yes, working on SMPS is a craze, especially after reading the book of Jestine yong!

  5. Joshua Oloo

    August 18, 2020 at 9:51 pm

    Thanks for the Article sir.don't you think using a thin wire as fuse is dangerous? your view on the same please

    • Parasuraman S

      August 19, 2020 at 12:57 am

      Yes. A wire does not have the same safety like that in the fuse. Fuse is made of special material as per standard specifications.

  6. Humberto

    August 19, 2020 at 11:45 am

    I´ve enjoyed reading this article, as usual. Keep on sharing your expertise.

    • Parasuraman S

      August 19, 2020 at 11:37 pm

      Sure, dear! Many thanks!

  7. Rajan

    September 27, 2021 at 8:58 am

    Good morning sir,

    I have come accross your artcle in the net, about refrigerator inverter board
    repair and foundit to be very educative and practical.we started a school for
    orphan children and teaching them the basics of refrigeration & AC and practicals too, takes a year for them to be ready. Can you guide us for the basic electronic's class, I want them to be strong in basics, they are all tenth passed and its free for them. thnak you, regards Rajan -


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