well your in for a fun time, seeing as the circuit had no diode... (seriously WTF?) first thing i would do is grab a multimeter and make sure that the power inputs when switched on are not shorted together, (e.g. blown cap or chip).
diagnosis steps,
test that 9V is at the plug before switcihg on, (battery removed, and correct polarity)
switch on
see that your voltage is still there, and that it is not heavily pulled down
if ok, next up, lift out the potentiometer that connects the lower op amp to the top one, and inject a signal to the top one, see if this gives any response on the output (this will verify is that chip works)
if ok, then replace the pot and turn your attention to the bottom op amp,
that should be enough to cover you for a while, and install a diode in the positive connection to the board if you can,