US 2.5 help

[Eco]

I'm not quite sure what to make of this.
I've had a basic circuit with an US wired up for a week now, and it's been running like a champ.

I started wiring up the accent LEDs this morning, and something weird has been happening. Without the LEDs wired into the circuit, so it's still an open circuit on the L2 pad, the speaker makes a click every second and a half-ish, in time with the flashing standby LED.

It doesn't make the click when the saber is ignited, however, nor does it make the click when I touch the pos and the negative wires together. However, it does still make the click when the circuit is closed with the LED in the circuit.

Did I damage something whilst soldering?

[Eco]

Nevermind, I've repaired it.
After getting up the nerve to take another whack at it, I found a bit of solder on one of the chip leads near the L2 pads.
It wasn't bridging anything, but removing the solder fixed it right up.

[Novastar]

Trippy...

[Jedi-Loreen]

You could have possibly had a microscopic solder bridge sitting on the board. If it's wide enough for single electrons to get through, then it's a bridge. Under a microscope, I've seen solder bridges many times smaller than a human hair.

[Shadar Al'Niende]

...Under a microscope, I've seen solder bridges many times smaller than a human hair.

Whoa....I have to sit back and think about that...

And I thought my soldering was fairly clean

[Jedi-Loreen]

That doesn't happen much in hand soldering, if at all, mostly in reflow solder in manufacturing.

[Eco]

You could have possibly had a microscopic solder bridge sitting on the board. If it's wide enough for single electrons to get through, then it's a bridge. Under a microscope, I've seen solder bridges many times smaller than a human hair.

Whoa... Makes sense, but it's really not something you'd expect...
Hm. Gonna have to watch for that in the future.