RK3588 making noises?

MNT Reform
1

Hi all! Does anyone hear RK3588 making funny noises, in particular when there’s anything happening on the screen?

I am observing both constant high frequency squeal, similar to what can happen with a lot of other electronics, but also suspicious chirring when there are screen updates. It’s noticeable for example with Firefox is fullscreen on https://gog.com main page and the slides are changing under “Highlights”.

What’s the source of this noise? Is it possible to silence it somehow? I’m observing this on the Reform classic by the way (2.0 motherboard).

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2

Hi, I think it’s either ceramic capacitor or coil whine, could be the 5V->4V buck on the RCORE adapter or something on the iCore itself. Would be interesting to pinpoint it.

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