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iMicro SMPS Repaired

By on June 29, 2015
smps repair







I was called by a co-worker because her PC was restarting continuously and a message was shown in Display: Power supply surges detected during the previous power on. ASUS Anti-Surge was triggered to protect system from unstable power supply unit! Press F1 to Run Setup.

smps repairing

This is a bad situation because she could not work. Her PC was an ASUS model P8H61-M LX3 Plus R2.0

smps repair2

Of course first thing done was to disarm the SMPS. The SMPS brand was iMicro and made in China

smps repair3

smps repair atx

All the e-caps were tested with the Blue ESR Meter and all were good. Surrounding components also found to be good. It left only one IC that I have not replace.

The part number was SD6109 (Voltage mode PWM Power Supply with built-in supervisor, protection and regulation for PCs).


Now there was need to change this IC and thanks God I had a similar one from another broken SMPS (same brand and same model) with the secondary coil already burnt-see the photo below.

smps coil burnt

The bad IC was changed with the IC I had removed earlier and when the power was applied, the power supply started to work normally. I have tested it for several days and it was perfectly good.

Note: It is good to keep some bad boards as we can salvage the components

In the next photo you can see some features of this PC and you will realize it was worth to save this PC.

pc smps repair


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

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  1. corriete

    June 29, 2015 at 11:05 pm

    nice are truly an expert in this field.keep up the great work

    • Humberto

      June 30, 2015 at 7:35 pm

      Thanks corriete.

  2. Amir

    June 30, 2015 at 12:09 am

    Hi Humberto,

    Nice Article, I did not understand what you meant by 'disarmed the smps'. did you mean discharged the smps?


    • Humberto

      June 30, 2015 at 7:38 pm

      When I say disarm the SMPS (Switch Mode Power Suply) I mean to take the upper cover off to see the circuit board, got it?

  3. Yogesh Panchal

    June 30, 2015 at 12:11 am

    Congratulations! for repair and giving new life to the PC.

    • Humberto

      June 30, 2015 at 7:40 pm

      Thanks Yogesh, I really enjoy reading your articles too.

  4. Sudhir dullip

    June 30, 2015 at 12:26 am

    Thanks Humberto you did a nice job ,thanks again by sharing your experience.

    • Humberto

      June 30, 2015 at 7:41 pm

      Thanks to all of you fopr reading our articles.

  5. Robert Calk

    June 30, 2015 at 3:45 am

    Good job, Humberto.

    • Humberto

      June 30, 2015 at 7:53 pm

      Thanks Robert.

  6. Albert

    June 30, 2015 at 5:31 am

    Hi Humberto, You are going Great. Just after the last Big Delta ATX 500 Watt Power Supply you again fixed another one ! Maybe you can lend me some of your Good Luck? (Joking).
    Until your next one!

    • Humberto

      June 30, 2015 at 7:46 pm

      Thanks Albert, I really confess I have read twice the e-Book Troubleshooting & Repairing Switch Mode Power Supplies by Jestine Yong. And I'm planning to read it over again.

      • Robert Calk

        July 2, 2015 at 2:10 pm

        That's wise. I've probably read it 10 times.

  7. John

    June 30, 2015 at 11:13 pm

    I love to see technicians who trouble shoot down to the component. Too many of to days techs are box swapped and never look to see how or why something failed. I just repaired a dryer board where the paid tech told the customer to replace the board. She bought a new dryer instead. I took the unit home found a cold solder connection on the board and now have a good dryer. The other tech never looked at the board. Hench the new mindset for repairs. BTW I'm a old tube tech.

    • Humberto

      July 1, 2015 at 8:46 pm

      John you are 100% right.

  8. Chris

    July 1, 2015 at 4:36 pm

    Humberto I like your post, my congratulation!
    I can see you are the man in charge. 🙂
    Good work and nice explanation.
    I learned something new from your post.
    Newer realized that message from a PC.
    Thanks for sharing, keep up.

    • Humberto

      July 1, 2015 at 8:47 pm

      Thanks Chris, you are welcome

  9. Austin

    July 2, 2015 at 6:31 am

    Humberto, how do you know that this fault is from ic?

  10. Austin Onweaba

    July 7, 2015 at 5:46 am

    Humberto, how do you test the ic and confirm that it is not good?


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