"I hooked it back up to the board using jump leads, powered up the 5V rail but there was no output. I hooked up the sig gen again and got output from both 74S112s. "
Do you have the onboard 5V checked at the oscillator as well??
And the ground to the oscillator?
5V onboard does not mean it is 5V everywhere.
Just my 2cts
Leo
satbeginner