Don't Miss


Found Failures Of Two Audio Output ICs In Locally Assembled 5.1 Speaker System

By on August 25, 2020
5.1 speaker system repaired

 

 

 

 

 

MAKE AND MODEL: Locally assembled 5.1 Amp set – It is not original Sony

COMPLAINT REPORTED: Two outputs dead, USB/FM not working, HUM noise.

audio 5.1 speaker systems repair

TROUBLESHOOTING AND RECTIFICATION DONE: Opened the set and cleaned it. I did not venture to remove the boards and clean the inside thoroughly as the interconnecting wires were so flimsy that any movement would break it away. Even if we take good snaps, which of-course I did, reconnecting it would be a difficult job. And, this is not a set worth spending a lot of efforts!

On powering up and checking it by injecting audio signals, I could trace the two outputs that did not work. The USB/FM unit was not functioning though getting on. The IC on it was heating up indicating a failure. So replaced the unit. Replaced the two TDA2030 ICs. (Two to three wires got cut while doing this!) The set came back to life and worked very well. Lubricated the controls and switches with switch cleaning oil. All its functions were checked for proper working. Mission accomplished and satisfaction got added.

HERE ARE A FEW PICTURES:

how to repair audio speaker system

tda2030 ic bad

how to fix audio 5.1 speaker system

This article was prepared for you by Parasuraman Subramanian from India. He is 70 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.




Please give a support by clicking  on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.

P.S-If you enjoyed reading this, click here to subscribe to my blog (free subscription). That way, you’ll never miss a post. You can also forward this website link to your friends and colleagues-thanks!

You may check on his previous repair article below:

https://jestineyong.com/dead-sony-klv-40r472a-lcd-tv-traced-to-faulty-pfc-adapter-and-brought-back-to-life/

 

Likes(59)Dislikes(0)

11 Comments

  1. Albert van Bemmelen

    August 25, 2020 at 12:46 pm

    I guess that this device was only marked being a Sony but that the label was added on this home made audio set to make it look original?

    Likes(2)Dislikes(0)
    • Parasuraman S

      August 25, 2020 at 6:38 pm

      Readymade cabinets are coming in the market like that. Anyone can easily make out that it is a local make. Sony is printed on it and not a sticker.

      Likes(0)Dislikes(0)
      • Henrique J. G. Ulbrich

        August 25, 2020 at 11:39 pm

        Not only the cabinets but when one looks more closely will see other problems: a wiring harness badly executed, the power supply doesn't have a circuit board (the rectifiers are not seen, perhaps floating) and there is a misalignment in one of the yellow (or amber) circuit boards (as one can see comparing the relative position of the two boards). Anyhow, your repair work continues to follow the same way: fast, well done and effective. And with a good and technical writing style. Thanks for sharing (201!!!!)

        Likes(1)Dislikes(0)
        • Parasuraman S

          August 26, 2020 at 11:50 pm

          Many thanks for your detailed analytical report! It matters a lot!

          Likes(0)Dislikes(0)
  2. Waleed Rishmawi

    August 25, 2020 at 6:20 pm

    TDA2030 so very easy to find..I have tones of them in my shop. any way, good job on the repair. have a blessed day

    Likes(1)Dislikes(0)
    • Parasuraman S

      August 25, 2020 at 8:28 pm

      Many thanks, dear friend! I too have enough stock of these!

      Likes(0)Dislikes(0)
  3. Humberto

    August 27, 2020 at 1:01 pm

    Another set saved by you, but as you said: it´s not an original SONY

    Likes(1)Dislikes(0)
    • Parasuraman S

      August 27, 2020 at 11:15 pm

      Many thanks! Yes, Alas! there are many such dupe and cheap practices prevalent in the market.

      Likes(0)Dislikes(0)
  4. Michael G

    August 28, 2020 at 12:45 pm

    Thanks for another great article, they are always very informative! I am new to these audio repairs, can you elaborate a bit more on how you “injected audio signals”?

    Likes(1)Dislikes(0)
    • Parasuraman S

      August 28, 2020 at 6:36 pm

      I have an audio signal injector. Kindly see my previous articles. I have explained about the use of it. https://jestineyong.com/servicing-philips-tv-tester-808tvt/

      Likes(1)Dislikes(0)
  5. Michael G

    August 28, 2020 at 11:19 pm

    Thanks! I will look into it.

    Likes(1)Dislikes(0)

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Free Report