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Blown High Voltage Capacitor In Power Primary Side

By on April 17, 2020
blown high voltage capacitor 103 1kv








dvd player repair

Customer sent to me this  Singer DVD system with the complaint of no power symptom. For your  information no power symptom can be caused by the power supply board or the mainboard. It is not necessary must be the problem in the power supply section. Unless you have confirmed that the power supply is giving good DC output voltages then you can suspect a bad mainboard. Once the cover was removed, these are the parts that I saw:

dvd player system board

dvd player main system board

Since the complaint was no power obviously the first component that I need to check was the main fuse.

With the use of my Ohmmeter to check on the main fuse, I found it to be open circuit. In the photo below, the arrow is pointing to the main fuse.

main fuse blown dvd

For your information there are two separate power supply  boards in this DVD system. The one on the table is for , protection, EMI and AC to DC conversion purpose. The one that was hanging (second power supply board) is where the main power supply is. It consisted of power FET, Switch mode transformer, output diodes, filter capacitors, Optoisolator ICs and etc. 

two power boards in dvd player

When I flipped the second power supply board for visual inspection, I saw a blown high voltage capacitor. 

103 1 kv blown capacitor

The value was 103 1KV and I replaced it with 103 2KV. Further checking did not found any bad components in the second power supply board.

103 2kv replacement blown capacitor

I concluded that it was only the main fuse and the high voltage capacitor that were bad.

I replaced both components after went through the series light bulb test. The result was good and the DVD player  set came back to life again. 

singer dvd player system repair

Conclusion- Sometimes power supplies repair can be tough but for this repair case, it was quite straight forward without needing any special test equipment to repair it. If you plan to repair switch mode power supplies, you can get Jestine’s SMPS repair ebook here. It is fully recommended and you will find that the information inside the ebook will worth every cents that you have invested. Ok see you in the next repair article…bye!


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

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  1. Waleed Rishmawi

    April 17, 2020 at 4:46 pm

    A straight forward repair but successful one. Good repair job and keep up the good work. Have a blessed day

  2. Albert van Bemmelen

    April 17, 2020 at 5:31 pm

    Thanks for sharing! Opening and afterwards closing the case of devices like these must have been the hardest part for most repair engineers. And using a new 2KV HV capacitor probably will prevent it from ever happening again.

  3. Mark

    April 17, 2020 at 7:55 pm

    Hey Suranga,
    Sometimes it's good to find a simple repair - it makes up for all those other ones that make you pull your hair out

  4. Parasuraman S

    April 17, 2020 at 10:22 pm

    Good job, though straightforward for a professional like you!

  5. Isaac mohale

    April 18, 2020 at 3:07 am

    Good work indeed

  6. Sergio

    April 19, 2020 at 8:49 pm

    Hello All,
    This is not a capacitor , this component i a varactor and its function is to short itself when is over voltage on it. It is for circuit protection . Almost on input wall voltage.
    Tnx, Sergio Manor

  7. Yogesh Panchal

    April 20, 2020 at 3:41 pm

    Nice inspection! suranga

  8. Henry

    April 29, 2020 at 8:42 pm

    This component looks like an MOV for surge protection.

  9. thushara

    October 19, 2020 at 1:39 pm

    good work....


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