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No Sound In Mini USB Subwoofer Repaired

By Jestine Yong on March 18, 2017

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

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.

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:

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.

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

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Note: You may check out previous post about fixing active speaker in the below link:

https://jestineyong.com/no-disc-in-singer-dvd-player-repaired/

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subwoofer repair

9 Comments

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.

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- 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.
  
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- 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.?
  
  Thanks
  
  Sid
  
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adeen

March 18, 2017 at 4:41 pm

A very good article thanks for sharing this,very usefull

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- Suranga Electronics
  
  March 19, 2017 at 12:47 am
  
  Thanks Mr.Adeen
  
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Robert Calk

March 20, 2017 at 2:09 am

Good job, Suranga.

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Humberto

March 20, 2017 at 9:03 pm

Well done Suranga. Congratulations.

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Parasuraman S

March 22, 2017 at 1:04 am

Well done!

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Yogesh Panchal

April 6, 2017 at 12:58 am

Good job!Suranga.

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