My OLED deck has the same issue. Zipping sound when the fan turns on. I am going to ignore this issue …

My steam deck OLED makes this noise too when using wired headphones. LCD model works fine.

My OLED usb c port won’t work with any device but if I connect usb hub, even without power - everything works fine. Very weird issue, but looks more like software than hardware.

I have the same issue. Old deck has zero noie. Oled s annoying with IEMs.

Maybe the temperature is the same but LCD has green tint and OLED has red tint. I have both and see this difference too. Didn’t try to match them yet.

Mine does it to. The buttons are different.