Jlawler:
It appears I am using the TSOP34838.
First thing to use a multimeter in conjunction with this datasheet:-
and ensure that the correct voltages/signals are applied to the correct pins. If the output pin is stuck low then that implies that power is not getting to device or is the wrong way round.
Note there are four version of the 38kHz device TSOP34838 and TSOP34438 which are wired one way and TSOP32238 and TSOP32438. If the board was designed for 322 series parts but 328 series parts were fitted then I would expect to see exactly what you are getting (output stuck low..
Have you tried connecting an oscilloscope to the output pin of the TSOP34838 to see if it ever goes high?
Ian