If your surround does not support HDMI passthrough then you hook from source to the surround and a video link to the HDTV.
WHY? Due to HDCP rules, high def sound (surround for instance) may not pass through a device with speakers. There are few notable exceptions such as over the air and apps on the TV but from the PS3 to the TV to the output and you get stereo.
I'm trying to figure the best way to hook up my Samsung led 3dhd tv, model UE40EH6030 to my Sony DVD surround sound system. The surround system is not hdmi compatible, so I have come to the conclusion that I will have to use the digital audio out on the tv and hook it up to the digital audio in on the surround system. Is it just as simple as just plugging in the digital audio lead as away I go, or are there other things/settings I'll have to configure? (Bit of a novice at this)
Also, to add another spanner in the works, I'd also like to run my PS3 through the surround system. What would be the best way for this, as I want the surround sound but also the hd picture quality at the same time. Can I use a hdmi cable from the ps3 to the tv for the picture quality, and the audio optical from the ps3 to the surround system for the sound? Any help for rigging this up the most efficient way would be appreciated. Cheers.