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Tips For Repairing UPS

By on April 21, 2018
ups problem cannot backup fix










A friend of mine who is also a technician brought me this UPS ( Model: Partner Digital PRD1050) that does not work.  The guy said that he checked the battery and that it is working fine. He said there is something wrong with this device. I promised him to take a look and see what I can do with it.

It took him a while to bring it to the shop for repair because he was trying to find out if it was covered by the warranty. It seems like it was not covered because one week later, he showed up in my shop and asked me to take a look.

how to repair ups

This sticker is found on the side of the UPS device that explains the specifications of it.

how to fix ups

When I powered up the device, there was only an indication of the AC power connected but it did not give me any indication of DC volts except the battery indicator and that does not mean anything. Even when I disconnected the AC source, there was no indication either of any DC source on that panel.

Screws were off and I could see a clean board on the inside and as well the battery. Take a look.

how to fix and repair ups

Checked all of fuses on the board and it seem like all of them in their best working order. I looked for burnt marks, plugged capacitors or any indication of something wrong but there was nothing of such sorts.

ups battery specification

The most common sense was to check the battery despite what the owner say about this device. The moment I took it out and checked the volt on that battery look what I found

ups repair

It was suppose to give me at least 12 volts reading but it was giving only 3 volts. For more conformation, I usually pick up the battery and shake it close to my ear and most of the time I hear something shaking inside the battery which means it is a dry battery and need to be replaced.

ups repair how to

What if the battery was not getting enough voltage to be charged? To make sure I did this test. While the UPS was power up, I checked the voltage reaching the two terminals. It was getting 14.21 as you can see in the phone.

That is a very important indication that the UPS is working fine and the battery is at fault.

ups problem cannot backup repair

Look what happened when I replaced the battery and unplugged the power source. I could see the display of the DC battery icon and I could hear the UPS peeping which is an indication of AC power lost yet supported by the power of the battery.

Mission Accomplished.

This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.

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  1. Mihai

    April 21, 2018 at 11:01 pm

    Hello, good article sir ! Thanks for sharing !

  2. Parasuraman

    April 22, 2018 at 12:05 am

    Very good!

  3. Charles

    April 22, 2018 at 3:59 pm

    We always look out for the complex things wasting time whereas the repair turns out to be so simple at the end thanks for encouraging tips.

  4. Albert

    April 22, 2018 at 4:03 pm

    I had a similar fault years ago in another UPS. Both 6V Acid Lead batteries were dead. The device itself was in good working order like yours.

  5. Mark

    April 23, 2018 at 6:37 am

    Sometimes, it is only a matter of 'making the complex, simple' 🙂
    Well done!

  6. Yogesh Panchal

    April 23, 2018 at 2:26 pm

    Good Job! Waleed

  7. Justice

    April 24, 2018 at 4:59 pm

    Interesting article once again thanks Walleed keep up the good articles.

  8. Robert Calk

    April 27, 2018 at 12:31 am

    Good job Waleed in not assuming that his diagnosis was correct!

    • Waleed Rishmawi

      April 28, 2018 at 5:03 pm

      Robert: what do you mean?


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