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This question already has an answer here:

I'm wondering what the underlying mechanism of the flickering of the panel indicator lights is. Are there electronic oscillators of some kind in there?

indicator

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marked as duplicate by Andy aka, winny, R Drast, Dmitry Grigoryev, Lior Bilia Jun 30 '18 at 19:03

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If the orange light blinks, then there is at least one, maybe two oscillators.

One to make the light blink and possibly one for a switching power supply to reduce the 230VAC power to a suitable voltage for the LED etc.

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