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SOUER AC Inverter Repaired

By on August 8, 2015
ac inverter repair







The complaint of this SOUER AC Inverter was no output voltage even though there was 12 volt input.

AC inverter repairing


There was no light when the 12 volt DC was connected to the AC inverter.

This means the AC inverter have problem and need to be rectified. Take a look at the photo below where the cover was removed.



The fuse checked to be good and I proceeded to check on the output FET and all are fine. If you do not know how to test electronic components, you can get Jestine’s ebook on how to test electronic components the accurate way.


Even the dual diode in a single package also tested good.

AC in 9

I started to check on all the SMD components. It took me about an hour to discover a bad 4.7 K ohm (472) SMD resistor. It was opened circuit.

472 resistor

Since I do not have this SMD resistor, so I used the common carbon film resistor as replacement. See the photo below:

AC IN 14

Once done putting in the resistor and powered On, I was happy to see that the bulb in the box was lighted. The malfunction of this AC inverter was only caused by an open SMD resistor-unbelievable!

AC INverter repaired


This article was prepared for you by Suranga Bandara who owns an Electronics shop in Anuradapura, Sri Lanka.

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You can read his previous article in the link below:




  1. Albert

    August 8, 2015 at 10:35 pm

    Hi Suranga, indeed a bit strange that in a 1000 Watt Inverter nothing worked because of only 1 little faulty SMD resistor. And all other high Power components still being okay. So Well found and repaired!

  2. Robert Calk

    August 9, 2015 at 12:25 am

    Good job, Suranga. I'm glad that you found the culprit.

  3. Yogesh Panchal

    August 9, 2015 at 1:16 am

    At last you have got culprit.
    good attampt.

  4. Tito Kanshulu

    August 9, 2015 at 4:15 pm

    Nice one Suranga.

  5. Bulent Nur

    August 9, 2015 at 6:13 pm

    Good job!

  6. Gabriel Maree

    August 9, 2015 at 10:32 pm

    Hi Suranga,
    I have a Auto Pro 800watt power Inverter.
    On switching on I only get 10 volts ac output.
    Fan is running and power LED shows red.
    Can you help. Or can anyone help.

  7. Samuel boateng

    August 11, 2015 at 6:17 pm

    A client brought a samsung led tv model LE32R73BD {R} C MODEL CODE LED32R73BCX/XEU TYPE BD32EO WHICH I AM NOT GETTING THE menu in the setup mode .it is hotel tv that came from the UK.YOU COULD JUST SEE THE MENU IN A HIGHLIGHT FORM .INEED HELP TO SOLVE IT.THANK YOU.

  8. Tyrone

    August 11, 2015 at 6:49 pm

    Very good Suranga.

  9. reza

    August 12, 2015 at 12:16 pm

    hi Suranga
    tjank u for this best article

  10. Humberto

    August 13, 2015 at 2:26 am

    Good repair Suranga. Congratulations.

  11. Om Arya

    November 23, 2015 at 1:07 am

    How did you know that the smd resistor was open circuit.. How to check!?

  12. Luciano

    March 15, 2016 at 5:09 am

    Good work Suranga

  13. Benjamin

    August 29, 2016 at 10:54 pm

    i have souer power inverter no ac power output what is the fault i want to repair it i need help


    July 14, 2017 at 5:43 pm

    OMG!!!I will try this one.
    I have the same unit model and same problem. 🙁
    Gladly I found this article.

    thanks mr. Suranga Bandara.

    I will update you asap for the results.

    Ricardo M.


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