Found Failures Of Two Audio Output ICs In Locally Assembled 5.1 Speaker System
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.
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:
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.
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You may check on his previous repair article below:
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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?
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.
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!!!!)
Parasuraman S
August 26, 2020 at 11:50 pm
Many thanks for your detailed analytical report! It matters a lot!
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
Parasuraman S
August 25, 2020 at 8:28 pm
Many thanks, dear friend! I too have enough stock of these!
Humberto
August 27, 2020 at 1:01 pm
Another set saved by you, but as you said: it´s not an original SONY
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.
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”?
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/
Michael G
August 28, 2020 at 11:19 pm
Thanks! I will look into it.