In poking around in my JVC hall synthesizer ("not that again!"), I
discovered that the voltage regulators have an "IC protector" in front of
them. The ICP-N38 for the 7805 +5V regulator is blown (ie, open). This might
be the reason the unit is acting funny. (There could be other problems. I'm
still poking.)

Obviously, I have to check "downstream" and make sure there are no shorts.
But I was wondering whether these protectors ever fail spontaneously.

Thank you.