Why it’s important to have oscilloscope and not always rely on multimeter measurement.

Here I post couple pictures of me, fixing LED WALL CLOCK.

There are spikes caused by (DC-DC converter) capacitor that failed (open, lost capacitance, high ESR) and they lead to RTC / MCU freeze and cause undesired operation.

On pictures there is waveform with failed capacitor (notice spikes) and after replacement.

Video:

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