Raspberry PI 3 B+ and Problems with sound output

[gerdb]

Had problems with my setup (RPI3 B+). I only heard some noise. Found out that the HDMI connector touches the headphone jack and causes a short circuit.

Solution: A piece of tape on top of the HDMI connector

[jcard0na]

Oh, wow! Thanks for reporting and providing the picture and a workaround!
I have reproduced this as well, and confirmed that when the HDMI connector touches the mini jack port, a high pitch screeching sound can be heard on the headphones. This is only an issue on the Raspberry Pi 3. The Pi Zero is shorter, and the Pi 4 has a smaller HDMI port (micro HDMI) that has a lower profile.

[jcard0na]

Ah, and your workaround worked flawlessly!