Twig OLED Display making a buzz sound

I just received a Twig OLED Display 96x96 ( … th=163_167). I managed to get it running.

There is one thing though! Is it normal to make a buzzing sound (just like some power adapters do)? This is related to a soon-to-be-damaged capacitor usually, isn’t it?

I can hear this properly whenever I put the back side close to my ear.

Any thoughts on this?

Thank you,

Thanks for puschase our product. The sound may from inductance. If the OLED works, that would be OK.

Isn’t it a fixed 1.4Mhz boost converter? I think inductor vibrations should be outside audible frequency, isn’t it?