Tpa3116d2 Amplifier not working properly

[S-fr]

I got this amp a while ago and now that im testing it, its heating very quickly, qnd the led is blinking, which i suppose should be, ik an amp is supposed to heat up a bit but not to the level that i could burn the finger when touched, i have add the pics, if anyone could help revive it, that would be a great help, also i did attached my testing speaker to see if there was any noise when i turn it onn, but there wasn't any.

 

[alec_t]

i did attached my testing speaker to see if there was any noise when i turn it onn, but there wasn't any.

Which terminals did you attach it to?
I see L+, L-, R+, R- on the underside of the board. I'm guessing it's a bridge-tied output.

 

[JimB]

Your amplifier appears to be well used and not new.
Where did you get it?
Was it said to be working?

There should be a heatsink mounted on top of the IC.

Look at this one, which seems to be very similar to yours:

TPA3116D2 2x50W Class D Stereo Amplifier Board with Volume Control

TPA3116D2 2x50W Class D Stereo Amplifier Board with Volume ControlThe board's design, with the popular TPA3116 chip, delivers Class D efficiency and high-quality clean sound reproduction. Pause the music and notice no hiss or hum. Turn the amp board on/off, with the included volume control, and...

www.parts-express.com

My best guess is that the IC is damaged.

But, have a look here:

Is that a solder blob shorting two pins together?

JimB

 

[S-fr]

Which terminals did you attach it to?
I see L+, L-, R+, R- on the underside of the board. I'm guessing it's a bridge-tied output.

Well i attached it to the Left speaker out, pic was taken after i unscrewed and removed the wir

 

[S-fr]

Your amplifier appears to be well used and not new.
Where did you get it?
Was it said to be working?

There should be a heatsink mounted on top of the IC.

Look at this one, which seems to be very similar to yours:

TPA3116D2 2x50W Class D Stereo Amplifier Board with Volume Control

TPA3116D2 2x50W Class D Stereo Amplifier Board with Volume ControlThe board's design, with the popular TPA3116 chip, delivers Class D efficiency and high-quality clean sound reproduction. Pause the music and notice no hiss or hum. Turn the amp board on/off, with the included volume control, and...

www.parts-express.com

My best guess is that the IC is damaged.

But, have a look here:

View attachment 143179


Is that a solder blob shorting two pins together?

JimB

Mann, i didnt even saw that, also i did bought and used it for a while, it been like 8-9 month since then it was in my bucket with all the other apms, ik i it works for sure but now that im using it, its not working, ill look into that pin shorting problem, and mann even i didn't notice that, thanks for noticing and pointing it out for me, ill update what happen next, and yes it also got a heatsink like that but ik for sure that class d ics like that aren't supposed to leave a burn mark on the finger when touched

 

[Nigel Goodwin]

Mann, i didnt even saw that, also i did bought and used it for a while, it been like 8-9 month since then it was in my bucket with all the other apms, ik i it works for sure but now that im using it, its not working, ill look into that pin shorting problem, and mann even i didn't notice that, thanks for noticing and pointing it out for me, ill update what happen next, and yes it also got a heatsink like that but ik for sure that class d ics like that aren't supposed to leave a burn mark on the finger when touched

Not much help for the amp you've probably killed, but to avoid burnt fingers NEVER just touch something you suspect is hot with a dry finger - lick your finger first, and if it's hot you'll hear the saliva 'boil' before it has time to burn you.

Old TV engineers trick

 

[Tony Stewart]

You could try using external power to reduce heat with 5V for debugging (4.5V min), although it is probably damaged inside.

Check if Fault pin is active. If one of the bridge-tied switches has faulted it will dissipate too much heat.

https://www.ti.com/lit/ug/slou336b/slou336b.pdf compare with eval board. Record test results on pins here.

 

[alec_t]

Welcome to ETO!
It is likely that the thread starter solved/abandoned the task 7 months ago.