This is a front panel for a piano-keyboard (Kurzweil SP3X), with buttons and button-LEDs. The LEDs did not work at all, and I traced it to a shorted capacitor (C2), which I removed and confirmed it was shorted. Is it ok to simply leave this (C2) open, not replacing the cap? It's just for convenience as I don't have tools at my current location. For learning it would be nice if you explained why it's ok or not.
Mostly there will be only 4-6 LEDs active on right panel. But during startup all LEDs light up simultaneously for about 0.5sec, as seen here at 12sec-mark: https://www.youtube.com/watch?v=szlCpS0GEhA