Today, it's very quite, not much lightning, only a few strokes around Germany.
So I try to find out some other unwanted "noise-generators" and found one :
The controller itself
The LCD, specially the voltage generation for the display-contrast :
The little sharp green spikes are produced from the negative voltage generation for the LCD. In this case, the developer should redesign this simple circuit.
Workaround :
Disable the PWM for the backlight by setting "Brightness" to 0 or 100%, setting "Auto Off" to a few seconds. This will disable the voltage generation for the contrast after the given time and also disables communication to the LCD.
Result :
After the given time, no noise anymore from the display :
This in not new, but it's a small thing to do, to avoid additional noise.
Thomas