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Guess Which Component That Had Caused Vibration Sound in Telesonic Speaker?

By on July 6, 2018
TELESONIC 5.1 Chanel Vibrate Sound fix











TELESONIC 5.1 Chanel Vibrate Sound

A customer sent to me this Telesonic subwoofer system with the complaint of vibration sound coming out from the speaker.

Testing with another good speaker have proven that it had nothing to do with the speaker thus the problem is in the electronics.

TELESONIC 5.1 Chanel Vibrating Sound

After removing the cover I could see seven pieces of audio amplifier IC (TDA2030) attached to a large heatsink. There were no other bad components (from visual inspection) and all the connectors were perfectly seated.

speaker vibrating sound repair

I started to check the audio amplifier IC  and made comparison and found that one of the amplifier IC  resistance was different from the other.

tda2030 ic bad

tda2030 ic faulty

Next, I took out the suspected IC and replaced it with a new IC.

Below is the datasheet of the TDA2030 IC. You can click on the photo below to view the pdf file.

tda2030 ic datasheet

After replacement with a new IC and powered On the sound was perfectly fine again (no more vibration sound).

tda2030 ic bad and faulty

TELESONIC 5.1 Chanel Vibrate Sound repair

Conclusion- When you see any IC that has similar part number (especially in a circuit that have two quite similar circuit like the left and right channel of amplifier) then you can use the resistance check. Any big differences in resistance reading indicates that the point you are comparing have problem. You can also perform such test on RGB transistors in CRT TVs and Monitors because the Red, Green and Blue have almost the same circuit and components.


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

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  1. ifa

    July 6, 2018 at 1:17 pm

    suranga, you are doing a great job. your posts are very very helpful to beginners and technician keep posting. ifa from trincomalee.

  2. Parasuraman

    July 6, 2018 at 2:05 pm

    Good service. Good tips too!

  3. Albert van Bemmelen

    July 6, 2018 at 3:12 pm

    Pro repair on how to find the bad TDA2030 in this impressive Telesonic Speaker out of 7 identical audio amplifiers.

  4. Yogesh Panchal

    July 6, 2018 at 5:10 pm

    Good job! Suranga

  5. behzad rasteen

    July 6, 2018 at 7:52 pm

    Hi Suranga
    Thanks for another successful repair report.

  6. Robert Calk Jr.

    July 7, 2018 at 12:17 am

    Good job, Suranga.


    July 7, 2018 at 4:13 am

    Thanks Suranga Bandara
    did you said (use the resistance check. Any big differences in resistance reading indicates that the point you are comparing have problem)
    in general case,the resistance could be high or low in comparison with the good amp component?

  8. James

    July 7, 2018 at 2:16 pm

    Thanks , excellent work with some Expert advice'

  9. Paisley PC Doctor.

    July 9, 2018 at 9:15 am

    Resustance readings are slow on digital multimeter. Save time by using the almost instant "diode mode".

    Put red probe on ground point and probe test points with black probe. Compare voltage readings. MUCH quicker.

    If you haveva circuit you work on regular, write the values and compare nect time to quickly identify faulty area.

  10. Justice

    July 9, 2018 at 5:21 pm

    Wow very discreet fault found steadily and comparative approach, Thanks Suranga.

  11. Alinta

    September 30, 2021 at 5:54 pm

    Thanks suranga.
    Please what's the function of TIP41 and TIP42 in a sound system?


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