Buzzer buzzing in dark theme
I have PanelDue v3.0 with 5" LCD and I noticed little buzzing in buzzer (or somewhere near to it) on board when powered up. Sound is not much noticeable, but it is there. It gets much stronger when I switch to dark theme on LCD. It sounds similar like when motors is blocked.
Does it occur only when you have the brightness set below maximum?
I haven't noticed changing brightness makes it different. It's still the same buzzing no matter what level of brightness is set. It seams that it makes this sound when LCD shows dark pixels (most covers backlight). So most noticable it will be, when showing all black screen.