Lynx I speaker making a whining noise (but still working)

[sirlynxalot]

Lately I noticed that the speaker in my recently purchased lynx I is making a high pitch low volume whining noise. The noise continues even when I pause a game, which normally turns off all sound. If I turn off the lynx, the noise stops, but if I turn it back on in short order, the noise is instantly audible again - though if there is significant time between turning off and then back on, then there is no whine at first. In the meantime, the game sound plays normally on top of the whine. I detected the whine while playing various different games.

Is this standard for the lynx 1 - maybe due to poor shielding of components? Or is this a sign my speaker or a particular cap near the general area of the speaker is about to burn out?

Edited April 26, 2014 by sirlynxalot

[GadgetUK]

Could be the 220uF cap related to audio (C11?). There are also a couple of caps on the input to the opamp - could be one of those?

Edited April 26, 2014 by GadgetUK