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: