I have a new Samsung 47 in LCD and Kenwood DVD purchased in 2005. I am trying to hook both up to get surround sound from my Kenwood VR-606. My signal is coming from a HD cable box. I'm using HDMI from the cable box to the TV. I don't get audio from all 6 surround speakers.

Aux use the rca

some ps3 games don't support stereo sound. Some have this optioning the settings. But other than this , thats why

Your TV is NOT an audio source by itself. It's job is to make pretty visual stimulus for your eyes, not your ears. Everything IT hears comes from somewhere else like a DVD, BluRay, Cable Box, right?

Get the absolute best TV-related audio directly from the digital audio outputs of each source you're watching, not the TV.

please select the 5.1 option in the audio menu of the reciever.

Component outputs do not provide sound. Component CABLES however can be used as a rather equal alternative to analog cables for audio.

Your receiver does not have connections for component, nor HDMI. You can however still connect your PS3 to it for audio by any one of its three digital inputs. It only has S-video and does not upconvert video signals so I recommend against making any video connections to it. Connect the PS3 video directly to your television for whichever video input it is compatible with High definition video. This method will always provide the best picture.

Well you have a built in decoder/surround processor that will detect a signal with the surround sound info(dvd/sat.receiver/cable converter etc.) and will then process it to the different speakers on your system. In the absence of that signal it will process it as standard stereo sound(two front speakers). You may want to look in your receiver functions/menu for simulated surround.
Hope this will help.

It all depends on the processing the receiver is doing when recreating the sound. Change the surround mode to Dolby Digital or THX if it's on there. When it is receiving a Left/Right signal only, it does some processing but pretty much spits it out of all the speakers, fronts being the loudest. That's why you always hear them. When it is getting a Digital signal, the receiver does a much better job of processing the audio to the correct speaker, but unless there is a lot of background noise, there might not be any signal going to the speaker.
Also, check to make sure that the "size" of the speaker on the rear channels is set correctly. There is a setting on most receivers to tell the receiver how big the speaker is on that channel. This sets the power level on the output to accomodate the size of the speaker.

unit needs repair. Look at the b speakers. Conect a speaker or two to the B position. If you have no sound than your surrond sound is ok and the unit is bad. Sound comes directly into the b speaker and not threw the surrond system. My 6070 has a cold start up problem. no sound. time to purchase a new one. to costly to repair.

download the manual from this link. It will show you how

http://www.retrevo.com/support/Kenwood-VR-407-Receivers-manual/id/480ag200/t/2/

All I can tell you is that "CD/DVD" must be selected as the source when using the optical digital input on the VR-606/616. I don't believe it needs more than one input (optical or coaxial) to output DTS sound, assuming the source is outputting DTS in the first place.