A healthy comparator is either on or off and cannot be partially driving the
LED. If the chip you mentioned is, in fact, a comparator and the LED is
conected between +V (or ground) via a resistor to the comparator output, and
nothing else is connected to this output, I would suspect that comparator to
be faulty.

Or, one of the signal inputs to the comparator may actually have
oscillations or noise on it, meaning the LED is being switched on and off
very fast, looking like it is glowing slightly. If you have access to an
oscilloscope, have a look and see whether we are talking DC offsets or
noise.


Gareth.


The LED in question comes off a surface mount resistor, which looks to
come directly from the 2nd output of one of the comparators. I'm not
sure how far back or what part of the circuit the leaky cap would be
in or whether I have the skill to trace it. The board is also pretty
cluttered with silk screening.