No Sound In 3 Channel Subwoofer System

By on September 26, 2015



subwoofer repair

 

 

 

 

 

 

 

subwoofer repair

The complaint of this 3 channel sub woofer system was that the right speaker does not have sound.

In order to see the circuit board inside, one need to open up the cover as shown in the below photo:

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Below photo is the amp PCB board and I did not see any loose cable connection.

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Next I powered up the board for couple of minutes before turning it off and touch on the semiconductors especially the ICs. What I found was that the two 14 watt Hi-fi audio amplifier ICs were shorted because both were overheated.

tda2030 ic

You can see the tda2030 ic schematic below:

audio ic

I took the PCB board out and tested it with buzzer test and it seems that few of the legs were shorted to ground.  It was surprised that even with this kind of short circuit the system did not shutdown and only affect the right speaker.

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ic shoted

tda2030 ic datasheet

I continued to resolder all the components joints in the circuit board to prevent any future problem cause by the dry joints. By the way, there were no other bad components in the circuit board.

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replace tda2030 ic

I replaced the two audio amplifier ICs and then tested the subwoofer again and found that it was working perfectly fine. 
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suranga

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:

http://www.jestineyong.com/sparking-sound-in-jvc-tv/

 

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7 Comments

  1. Mark

    September 26, 2015 at 2:29 pm

    Good job Suranga. I have a similar unit that needs repair, but only works on the front speakers, not centers or rears. It is in my 'to do' pile, but will check out for shorted components as you have described.
    Thanks!

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  2. Albert van Bemmelen

    September 26, 2015 at 3:46 pm

    Good Job Mr. Suranga. The TDA 2030 is an Amplifier that exists for quite a long time now. I didn't even know that they still used it in Audio systems. I believe they are originally made by Philips and/or SGS-Thomson. The Amplifier has a Thermal Shut down circuit integrated. But the TDA 2030 is hard to get in places like in the United States. I read that the NTE 1380 is an exact replacement? Mostly 2 of them are used in a Bridged way for more Power. That's probably because of the mostly low Power Adapter Voltages since you need 10 times the power for any sound to be twice as loud. They are normally almost indestructable and could also be found in TV-sets.

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  3. Yogesh Panchal

    September 26, 2015 at 8:22 pm

    good job Suranga and thanks for sharing.

    Likes(4)Dislikes(0)
  4. Humberto

    September 29, 2015 at 11:41 pm

    Good repair suranga, keep up.

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  5. MAHIN FOFO

    October 28, 2015 at 11:51 pm

    dear suranga sir

    good job keep up the great job

    May god bless you all , you technicians & experts really are genius the best

    i salute as well as respect you all

    mr. jestine sir

    i wanna be like you in future
    you are my boss in the world of electronics repairs & services
    i really respect you a lot from the bottom of my heart

    i always remember you all in my prayers
    i need your blessings plz pray for me
    i wish if i could work & learn from u

    stay blessed dear sirs

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  6. salauddin

    September 14, 2016 at 11:06 am

    oh great job, thank you lot.

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  7. ALI

    January 10, 2017 at 2:25 am

    HI.WHERE IS THE SUBWOOFER OUTPOT ON BOARD.PLEASE WITH PHOTO OR SCHEMATHIC OR OTHER simple way.

    Likes(1)Dislikes(1)

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