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Transformer Problem In USB FM Receiver

By on August 24, 2015
fm radio repair








fm radio repair

This USB FM radio receiver came in for repair with the complaint of no power. With few screws removed, the cover can be lifted up.

repair radio

I powered On the set and check if there is any AC voltage at the secondary side of the 3 volt linear transformer.

And the result, there was totally no output voltage which could mean either the transformer itself have problem or the primary side area has an open circuit.

transformer bad

When I checked on the linear transformer primary winding I found that it was having problem.

repair radio receiver

And when I carefully observed the transformer, I saw that there was burnt mark in the transformer probably overheated-see the photo below:

burnt transformer

Since the transformer already burnt, I left no choice other than to replace with a new linear transformer with the specification of 3 volt output 300 Milliamp (ma).

replace linear transformer

It was working fine so I installed the transformer back to its location.

install transformer

It is not tough to repair electronics devices. The best you must know the systematic approach of the troubleshooting procedure. If you are a beginner and would like to venture into this repair field whether to be a repairer or just for hobby interest you can check out Jestine’s Ebook here.

repair transformer radio


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

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Note: You may check out his previous repair article in the below link:




  1. Mark

    August 24, 2015 at 11:47 am

    Hey Suranga,

    Thanks for your article. Its great when it is a simple repair, but it is still the process that we can learn from that makes us better repairers.

  2. Robert Calk

    August 24, 2015 at 12:43 pm

    Good job, Suranga. Thanks for the article.

  3. jim asch

    August 24, 2015 at 2:08 pm

    very good information thanks jim ham call wb9orv

  4. aziz

    August 24, 2015 at 2:32 pm

    Very good . Thank you

  5. Yogesh Panchal

    August 24, 2015 at 3:49 pm

    Another good quick fix.

  6. Merlin Marquardt

    August 24, 2015 at 8:56 pm

    Good repair.

  7. Chris

    August 27, 2015 at 6:51 pm

    Suranga thanks for sharing.
    Excellent picture quality and very interesting, simple quick repair for novice in electronic world.
    My best regards.

  8. Raju varghese

    August 29, 2015 at 2:21 pm

    Hai suranga ,good job Thank you for sharing

  9. sreenivasak

    August 29, 2015 at 5:38 pm

    this could have been concluded when the radio functions on batteries


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