Just purchased a Sony Bravia 49XD8305. Great picture but the sound quality is awful. Speech is really hissy even through the sound system. Is there a setting that needs changed

Sony sets will have good picture quality. There is no doubt about it. Check your picture settings. Download the user manual to this set, and refer it. Make sure that all picture settings are correct.
Click here to download the user manual to your TV.

I would Google the model number carefully for "problems" "no sound" and usually this set will display some kind of error code===it may even have a hard reset to try===service manuals are available on the net/web to allow you to see how the sound circuit is set up etc.

You could get better sound quality and volume by attaching powered stereo speakers to your Sony via the headphone socket.

How does the center speaker sound when you run the test tones on page 26?

Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/RCA-RTD209-Home-Theater-Systems-manual/id/404ci776/t/2/

Check to see if there is a Firm Ware Upgrade for you player.

I want my computer photo to see it on cd/dvd players

The DVD player may have multiple output formats that can be displayed. Sounds like you have the composite output selected when you have the component output selected on the DVD player. Check the menu options on the DVD player and confirm they match the way you have the player connected

I have purchased KLV-40W400A Full HD but I am not satisfied with the picture quality. When the issue was raised sony is putting blame on Tata Sky and vise versa.
Kindly suggest.

Do you have a cable or satellite box connected to the tv?

Try plugging the coax directly into the T.V. or from you VCR or DVD player then to the TV. The bravia sets also have various picture mode settings as you will discover when you go through your manual. Cable boxes or splitters can cause problems also is they are not of good quality. I love my 40.