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No Sound In Mini USB Subwoofer Repaired

By on March 18, 2017
how to fix mini subwoofer












mini subwoofer repair

A customer sent to me a USB Mini Subwoofer set for repair and the complaint was no sound but have power.

mini usb sub woofer repair

fix subwoofer

When the AC power was connected and I plugged in the USB, I could not hear any sound coming out from the speakers.

From my repair experience, if there was no sound, usually the problem can be dry joints, missing DC supply voltage to the audio amplifier IC or the power amplifier IC itself have problem.

subwoofer no sound

how to check lr signal of subwoofer

tda2003 a ic check

The 15.2 dc volt supply voltage to the amplifier ICs was good also. Since there was no dry joints and dc supply voltage to the amplifier ICs was normal, I decided to replace both the amplifier IC TDA2003A. You can also take a look at the datasheet of the TDA2003A IC in the photos below:

how to repair subwoofer no sound

tda2003a ic bad

tda2003a datasheet

tda2003a schematic

how to fix mini usb subwoofer

Once the new ICs were fitted, I inserted the USB drive and the sound came back. It was a pretty straight forward repair because the circuit was not complicated. All the best to you all.

no sound in subwoofer repaired


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

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  1. Albert van Bemmelen

    March 18, 2017 at 3:19 pm

    Thanks for the article Mr.Suranga. Good job and another happy customer. "Checked L-R out signal and Power out 12V is okay. No problem"? under the clear photo however puzzled me a bit.
    I suppose you had tested if the speakers were still okay with another audio signal, because there must have been no L-R signal out coming from both bad TDA2003As.

    • Suranga Electronics

      March 19, 2017 at 12:44 am

      Thanks Albert,
      I checked L.R signal USB/ TF card unit out signal and not main Amp L.R.

    • Sidney Pires

      May 1, 2017 at 1:47 pm

      I need help to repair my Digital Piano Kawai PN70, I just have sound when I plug my Headphone to the headphone jack. I need to troubleshoot why I have no sound coming out of the speakers. Can somebody give me a hint.?



  2. adeen

    March 18, 2017 at 4:41 pm

    A very good article thanks for sharing this,very usefull

    • Suranga Electronics

      March 19, 2017 at 12:47 am

      Thanks Mr.Adeen

  3. Robert Calk

    March 20, 2017 at 2:09 am

    Good job, Suranga.

  4. Humberto

    March 20, 2017 at 9:03 pm

    Well done Suranga. Congratulations.

  5. Parasuraman S

    March 22, 2017 at 1:04 am

    Well done!

  6. Yogesh Panchal

    April 6, 2017 at 12:58 am

    Good job!Suranga.


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