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Old 30th April 2014, 09:42 PM   #1
aspaeth is offline aspaeth  United States
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Default TPA3116D2 Sound Issues

I recently purchased a TPA3116D2 2.1 Amplifier online, and it worked great when it was plugged into my speakers and subwoofer. I began building an enclosure for it, and needed to extend the volume potentiometer about 7 inches out. I did not have a desoldering tool, so instead, I yanked off the current potentiometer with tweezers, and used the tweezers and my solder gun to pull out the remaining pins.

In the process of doing that, I accidently overheated two traces going to the two middle pins (I believe these are for output for left and right?) so I soldered two short jumper wires from the new pins to the points that the traces originated from. I plugged in my volume potentiometer using jumpers between the new pins I put in, and turned everything on.

Good news, I got sound, however the sound was like background music? For example, I could hear the guitar player perfectly in the song, but could not hear any vocals. I changed to more songs, and it seemed like it was playing clear (no distortion) whatever was going on in the background, but there was a whole piece of the music missing. What could be my problem? I've looked around and cant seem to see any traces that might also be damaged?

I've uploaded a few pictures of my amp the way it sits right now:

https://app.box.com/s/ytzqdns4xg2phdl9p1s4
https://app.box.com/s/txr0qdgm40cyawero0si
https://app.box.com/s/eokwpoftstwrlqy1ivyn
https://app.box.com/s/z3yblccs461a3k4uqxtu
https://app.box.com/s/32lt8zwvi0817uywyzkf

And last but not least, this is the version of board I purchased:
2.1 High-power 100W Digital Amplifier Board Subwoofer TPA3116D2 Super Bass 50W+50W - Free Shipping - ThanksBuyer

Thank you for your help!
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Old 1st May 2014, 12:17 AM   #2
DUG is offline DUG  Canada
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Just some suggestions:

Smaller wire, less solder, clean flux with alcohol.

Check for shorts after you have removed everything and then check for shorts after each wire is installed.



P.S. Good pix
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Old 1st May 2014, 08:22 AM   #3
Morfeus is offline Morfeus  Germany
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Apart from the soldering, which really really has to be redone, it could be the connections at the pots. Those are in, out and ground. Check the data sheet of the pots if connected correct.
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Old 1st May 2014, 11:21 PM   #4
aspaeth is offline aspaeth  United States
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Thank you both for your help! I really appreciate it. However, I can't seem to figure out what is causing the issue. When the original pot is plugged in (the one that came with it), plugged in exactly the way it was before, the volume does not change when I twist the pot, and it is only playing background music from whatever track I'm playing.

Since I'm not very skilled at this stuff, I think I'm going to just buy another amp. Would it be a better idea to put a pot between the input source and the amp and just keep the volume on the amp on full blast? I imagine if I try desoldering again, I'll end up with the same issues lol.
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Old 2nd May 2014, 08:38 AM   #5
irribeo is offline irribeo  Netherlands
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Pot is in out and ground and those become signal + and signal min. If all mono sound is gone, only stereo info left, seems something like that?, it could be switched or shorted somewhere
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Old 1st July 2014, 01:02 PM   #6
Rewind is offline Rewind  Sweden
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I hear the same thing when I my headphones come out of the 3.5mm socket.
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Old 1st July 2014, 02:06 PM   #7
DUG is offline DUG  Canada
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Quote:
Originally Posted by Rewind View Post
I hear the same thing when I my headphones come out of the 3.5mm socket.
You are using headphones on a TPA3116 amp?
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Old 1st July 2014, 02:33 PM   #8
irribeo is offline irribeo  Netherlands
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This one could be OK on headphonesMost others would have sound issues I guessClick the image to open in full size.
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Old 1st July 2014, 02:41 PM   #9
Rewind is offline Rewind  Sweden
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No, that would set my hair on fire! :S

The description of the sound issue remind me of when I accidently mix earth and right left poles by pulling out the 3.5mm headphone from the jack in my phone while listening to spotify. The area that carries line level is a good place to start. Doubt there is something wrong with the chip if it worked before.
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Old 1st July 2014, 02:53 PM   #10
DUG is offline DUG  Canada
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If you wired the pot like the incorrect example there would be very little change in volume until it was turned down so as to load the source.

It may affect tone of the sound as well.

Just a thought.

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