Have had the same issue as well with my DIY kit 🙁
The LED does turn on, but no sound is produced (speaker or headphones). Saw the prior recommendations and tried the suggested configuration of knobs with no luck.
I looked at the the solder joints in the audio section around the LM396 chip and didn’t see any issues, is there a better way I should be checking these? If not, what’s the next step in trouble shooting this?
Thanks for any help!
Katherine