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Why this is happening?

Why this is happening?

When we waited for our turn to the elevator, I've noticed that something strange occurs at the display of the elevator.

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Date added:Jul 16, 2019
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Nelson Ogden

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Jul 16, 2019 at 12:13 PM Author: nogden
Leakage current on the circuit board that drives the LEDs?
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Aug 16, 2019 at 10:31 AM Author: Ash
I would expect that the circuit board is right there behind the display (with only power and serial data connection coming to it), so not much place for leakage...

I think there is high ripple on the DC power supply to the display module, which causes it to display glitches. Very possibly due to a bad capacitor
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