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No Sound In 3 Channel Subwoofer System
The complaint of this 3 channel sub woofer system was that the right speaker does not have sound.
In order to see the circuit board inside, one need to open up the cover as shown in the below photo:
Below photo is the amp PCB board and I did not see any loose cable connection.
Next I powered up the board for couple of minutes before turning it off and touch on the semiconductors especially the ICs. What I found was that the two 14 watt Hi-fi audio amplifier ICs were shorted because both were overheated.
You can see the tda2030 ic schematic below:
I took the PCB board out and tested it with buzzer test and it seems that few of the legs were shorted to ground. It was surprised that even with this kind of short circuit the system did not shutdown and only affect the right speaker.
I continued to resolder all the components joints in the circuit board to prevent any future problem cause by the dry joints. By the way, there were no other bad components in the circuit board.
This article was prepared for you by Suranga Bandara who owns an Electronics shop in Anuradapura, Sri Lanka.
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