Guess Which Component That Had Caused Vibration Sound in Telesonic Speaker?
A customer sent to me this Telesonic subwoofer system with the complaint of vibration sound coming out from the speaker.
Testing with another good speaker have proven that it had nothing to do with the speaker thus the problem is in the electronics.
After removing the cover I could see seven pieces of audio amplifier IC (TDA2030) attached to a large heatsink. There were no other bad components (from visual inspection) and all the connectors were perfectly seated.
I started to check the audio amplifier IC and made comparison and found that one of the amplifier IC resistance was different from the other.
Next, I took out the suspected IC and replaced it with a new IC.
Below is the datasheet of the TDA2030 IC. You can click on the photo below to view the pdf file.
After replacement with a new IC and powered On the sound was perfectly fine again (no more vibration sound).
Conclusion- When you see any IC that has similar part number (especially in a circuit that have two quite similar circuit like the left and right channel of amplifier) then you can use the resistance check. Any big differences in resistance reading indicates that the point you are comparing have problem. You can also perform such test on RGB transistors in CRT TVs and Monitors because the Red, Green and Blue have almost the same circuit and components.
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 his previous post in the below links:
https://jestineyong.com/you-will-be-stunned-of-whats-found-inside-the-tv-no-power-fault/
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ifa
July 6, 2018 at 1:17 pm
suranga, you are doing a great job. your posts are very very helpful to beginners and technician keep posting. ifa from trincomalee.
Parasuraman
July 6, 2018 at 2:05 pm
Good service. Good tips too!
Albert van Bemmelen
July 6, 2018 at 3:12 pm
Pro repair on how to find the bad TDA2030 in this impressive Telesonic Speaker out of 7 identical audio amplifiers.
Yogesh Panchal
July 6, 2018 at 5:10 pm
Good job! Suranga
behzad rasteen
July 6, 2018 at 7:52 pm
Hi Suranga
Thanks for another successful repair report.
beh
Robert Calk Jr.
July 7, 2018 at 12:17 am
Good job, Suranga.
HICHAM CHAMSI
July 7, 2018 at 4:13 am
Thanks Suranga Bandara
did you said (use the resistance check. Any big differences in resistance reading indicates that the point you are comparing have problem)
in general case,the resistance could be high or low in comparison with the good amp component?
James
July 7, 2018 at 2:16 pm
Thanks , excellent work with some Expert advice'
Paisley PC Doctor.
July 9, 2018 at 9:15 am
Resustance readings are slow on digital multimeter. Save time by using the almost instant "diode mode".
Put red probe on ground point and probe test points with black probe. Compare voltage readings. MUCH quicker.
If you haveva circuit you work on regular, write the values and compare nect time to quickly identify faulty area.
Justice
July 9, 2018 at 5:21 pm
Wow very discreet fault found steadily and comparative approach, Thanks Suranga.
Alinta
September 30, 2021 at 5:54 pm
Thanks suranga.
Please what's the function of TIP41 and TIP42 in a sound system?