Hi Annette.
I'm not sure what level you're needing a code for. If you're looking for unversal remote codes to try to pair a remote to the TV, a listing can be found here
4 digit codes for TV sets including LCD Plasma and Panel TVs GE universal...
I'm not finding anything else about Hitachi TVs and a 4 digit code.
Is this 'no signal' coming in off of a cable, or off of broadcast TV? You may also want to check if there are multiple inputs and you're on a not-plugged-in input. For instance, the TV may have 3 HDMI inputs and a set of component video inputs. If, say, your cable box is connected to HDMI 2 and your DVR is plugged into HDMI 3, then if the system defaults to HDMI 1 when it turns on, perhaps it's showing some error code. You should have some sort of input select function. Try cycling through your inputs to make sure that the set is OK playing from other canned input like a DVD player. If so, then move that input through the imput ports to make sure they work.
If the TV has a direct cable coaxial hook-up, most, if not all cable companies anymore only broadcast in encrypted digital, meaning you'll need a cable box or something like a TiVo with a special cable card to see anything.
More specifics would need the make / model / year of the set.
Hoping this helps!
D
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