Your TV has Optical Digital Audio out.See your manual page 81. You need an optical cable and a DAC (Digital Audio Converter) to connect either an RCA cable (going to your Audio System) or to plug headphones into.
if there is no headphone jack then i dont think there is any other way that you can use the headphones in it and as its a TV i dont think that the USB headphones will work in it the software of The TV wont detect it as Headphones
Since the TV doesn't have an audio out, you would have to use the audio out of the signal source. If you have a set top box, you might be able to rig something up using that.
Your TV has Optical Digital Audio out.See your manual page 81. You need an optical cable and a DAC (Digital Audio Converter) to connect either an RCA cable (going to your Audio System) or to plug headphones into.