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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