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Two ICs Burnt In USB Mini Amplifier
The complaint of this USB Mini Amplifier was no sound but the USB drive was working fine.
Even when the volume control was turned to maximum, there was still no sound.
Checking on the speaker wires, I found that the wires were properly connected and the speakers were good.
This means I had to open up the case and perform the troubleshooting. Once the cover was lifted I saw a LM7805 voltage regulator IC in the center of the circuit board. I did not start troubleshooting it, instead I scan around for any burnt components first before power On and check on the dc supply voltage.
Just few seconds looked into the board, I saw the two TDA2005 IC amplifier were burnt-see the photos below:
Below photo is much more clearer as where both the ICs were located (see the yellow arrow)
I did not straight away replace these two ICs, because I wanted to check if there are other components that gone bad as well. After spending some times checking, I concluded that only the two ICs were faulty. Below is the photo where you can see how severe the ICs (left one) burnt. This is why the amplifier can’t produce any sound at all.
If you would like to see the datasheet in more details, you can click on the picture below:
This article was prepared for you by Suranga Bandara who owns an Electronics shop in Anuradapura, Sri Lanka.
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