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Power Saver Repaired

By on December 6, 2013








A friend of mine sent to me a power energy saver device for repair and the complaint was no power. For your information I have notrepair such device before.

There are four screws that secured the cover and the head of the screws were of special type. Surprisingly I have a normal Philips screw driver that could fit into it and I managed to remove the cover.






The first thing I saw was the big silver capacitor.


There was a small circuit board that consisted of some components.

power saver repairs

In order to be in the safe side, the big capacitor had to be checked first and I found there was no charge in it. I tested the capacitance value of this big capacitor with a digital capacitance meter and Blue ESR meter. Take a look at the photos below:


powersaverrepair circuit

There are 14 components found in the small circuit board:

1 Varistor

4 silicon diodes

1 electrolytic capacitor

1 fuse

3 resistors

1 film type capacitor

1 24 volt zener diode and

1 Relay


power saver circuit board



The main fuse was tested good so I proceeded to remove all the components and checked it off board. The reason I removed the components to check off board was because I’m not familiar with such circuit. Since it contains only 14 components so removing the components and test them was not so difficult. If you know what you are doing and have the speed in Testing Electronic Components, you can finish testing all the components in less than 10 minutes. Of course you can power up the unit and perform voltage testing- it is your preference.

All the components were tested good except the relay and the film type capacitor. So I continued with the relay test with the help of a DC voltage regulator power supply. The relay was tested good and left only the film type capacitor. I used the TES1500 digital capacitance meter to check on the value and look what I have found:


The capacitor was open circuited. The function of this capacitor is to filters out harmful EMI/RFI line noise so that the circuit have a cleaner power to work with. An open circuit in this capacitor means no ac wave will pass through it to the next circuitry thus causing no power symptom. Areplacement brought the power energy saver device back to life again.

power energy saver

power saver

Conclusion- In the future if this device gives problem again I guess it will take lesser time for me to find out the fault. These components are easy to test and finding the parts was not difficult at all. The components can be easily found from any local electronic stores. If you know how to test electronic components this means you can perform such repair work. But of course you must know the safety first such as the right way to deal with AC and undischarged capacitor which can be fatal to you if you are not careful enough.


Jestine Yong

Jestine Yong










  1. Nadeem Shaikh

    March 26, 2016 at 1:41 pm

    Dear Yong


    we really appreciate your work.
    can you please share complete details of components with their values.
    we are looking for your positive response.


    • Jestine Yong

      March 26, 2016 at 3:44 pm

      Hi Nadeeem,
      I have returned the set to the customer so no info can be taken-sorry.


  2. Zaf

    September 19, 2019 at 6:58 pm

    Hi Sir,appreciated your sharing. Just want to ask whether it is possible to test the component without remove them from circuit board?

    • Jestine Yong

      September 22, 2019 at 9:34 pm

      Hi Zaf,

      It depends on the components. Some components like fuse, coil, led and etc can be tested on board. For diodes, transistors, FETs, bridge rectifier and etc you need to test it off board.



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