Good morning folks,
I set up my Atomic Pi yesterday - I've had it for a while but didn't set it up until now (ordered 26th of April). I seem to be getting noise artefacts on HDMI audio out. I've had this with both the original built in EMMC OS, and LXQT from the official download page. It sounds like interference - reacts to screen activity in particular in that it changes tone and pattern. It makes noises like a graphics card with a failing capacitor, but from the sound output rather than from the board.
I've switched HDMI cables, bypassed my HDMI switcher and used the other input on the TV. Nothing else plugged into the same setup does the same thing.
Interestingly, the noise is independent of amplification (doesn't get louder when I turn up the system sound volume).
I can only think that it is either a hardware fault, or excessive noise from the power supply? I'm powering the board with one of these : https://www.ebay.co.uk/itm/5321223337128
I thought perhaps I'd put my power in connection too close to the HDMI jack, but tried bodge shielding it with a piece of aluminium foil and a plastic card (so I didn't short anything) but it made no difference.
Anyone had a similar experience? Or more importantly, anybody know a solution? Feel free to ask for further clarification. By luck, I have a second Atomic Pi landing tomorrow which will be useful for cross comparison / identifying if the issue is on or off board.
Thoughts welcome. Cheers, Phil.