how to connecr regent surround sound to lg lcd tv

Solution
It would depend on what outputs your unknown model LG TV has and the input the old regent th400 that I can't find online has.
If the TV has a headphone jack or analog audio output then use that to connect to the HTS.
If the TV has an optical audio output then use that. If the HTS has coax digital then you need a converter. If it doesn't have digital you will need an optical to analog converter.
If the TV has HMDI-ARC you would need an HDMI-ARC audio extractor.
If the TV doesn't have any audio outputs then you could get audio from your external sources either directly or using an HDMI input selector with audio extraction.
It would depend on what outputs your unknown model LG TV has and the input the old regent th400 that I can't find online has.
If the TV has a headphone jack or analog audio output then use that to connect to the HTS.
If the TV has an optical audio output then use that. If the HTS has coax digital then you need a converter. If it doesn't have digital you will need an optical to analog converter.
If the TV has HMDI-ARC you would need an HDMI-ARC audio extractor.
If the TV doesn't have any audio outputs then you could get audio from your external sources either directly or using an HDMI input selector with audio extraction.
 
Solution