I only get sound out of 2 front speakers with 5.1.

If your surround sound receiver unit has rca audio inputs(red/white), you can hook up any brand of DVD player that has rca outputs. You would hook the yellow output from DVD player to yellow input on TV. Hook red/white output from DVD player to red/white input on surround receiver. Hope this helps.

If your DVD disc supports it, you will have to enable surround sound from the DVD, as well as the speakers.

Not really enough info here to help much yet.

Helpful info would be:

1.Are you hooking up coax or optical surround from the DVD and have you set the amp to look at the correct type of input?
2. I could be much more specific with help if knew the model number of the surround system and DVD changer.

out of tv, into the combo, out of the combo into the surround amp and this work

are you tryng to get digital surround ? you can only get left and right audio or virtual surround sound if there is no optical or coax digital audio input connected from the sources digital output for that selection

Please check at rear of TV for Digital Optical IN port as home theater should have optical out port at rear. If you got any optical in port in TV, just connect optical wire between TV and home theater.

2nd option is check Line Out pins at rear of home theater system, if found, hook red-white RCA cable there and put it to same input in TV where you hooked Video (composite or component) cable.

Let me know the results to help you more.

Sounds like it's just in 2 channel stereo mode, only 2 speakers working out of 5 and a sub, look for a selector switch for switching to 5.1 surround, as far as the no video problem try replacing the cable for the video connection. 

While I could not find it in the manual, I found that you must
go to the menu, open Sound Options and set Speakers to "Fixed".

Note: If you turn off the Surround Sound or DVD player combination you must then go back to the menu and turn the speakers back to Televsion.

It looks like all you'll need to do is hook up audio out from DirecTV to audio in on the surround sound system. Sony has an interesting hookup recommendation guide on the product support site:

http://esupport.sony.com/US/perl/model-home.pl?mdl=DAVC700&LOC=3

That should give you the connection options. The short answer, though, is to connect the best audio out from DirecTV to an audio in on the surround sound and then choose that option in the surround sound system when you want to watch TV.

do you need a reciever to get ceiling mounted speakers to work surround sound