SOUER AC Inverter Repaired
The complaint of this SOUER AC Inverter was no output voltage even though there was 12 volt input.
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.
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.
Since I do not have this SMD resistor, so I used the common carbon film resistor as replacement. See the photo below:
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!
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:
https://www.jestineyong.com/hitachi-14-crt-tv-repair/
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14 Comments
Leave a Reply
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!
Robert Calk
August 9, 2015 at 12:25 am
Good job, Suranga. I'm glad that you found the culprit.
Yogesh Panchal
August 9, 2015 at 1:16 am
Suranga,
At last you have got culprit.
good attampt.
Tito Kanshulu
August 9, 2015 at 4:15 pm
Nice one Suranga.
Bulent Nur
August 9, 2015 at 6:13 pm
Good job!
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.
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.
Tyrone
August 11, 2015 at 6:49 pm
Very good Suranga.
reza
August 12, 2015 at 12:16 pm
hi Suranga
tjank u for this best article
Humberto
August 13, 2015 at 2:26 am
Good repair Suranga. Congratulations.
Om Arya
November 23, 2015 at 1:07 am
How did you know that the smd resistor was open circuit.. How to check!?
Luciano
March 15, 2016 at 5:09 am
Good work Suranga
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
RICHITO SHI
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.
Regards,
Ricardo M.