There is no sound from the tv, how do I turn on sound?

Could be a problem in the motherboard make sure you check for recalls but first check to make sure that all your programmed settings are correct with your remote through menu

Here are the most common reasons you may not have sound.
Starting with the most common solutions for no sound from TV:
Television Has No Sound Answer 1: Make sure TV is not muted.
Television Has No Sound Answer 2: Make sure the TV is not set to SAP (secondary audio protocol)
Television Has No Sound Answer 3: Make sure TV input is correct (someone may have accidentally pressed the "aux" input button or similar causing the TV to use an input with no sound going to it)
Television Has No Sound Answer 4: Make sure there is not a pair of headphones connected to the TV audio out jack on the side or front of your TV.
Television Has No Sound Answer 5: Check all of the cables that are connected into the back of your TV. (it is possible the TV was moved slightly and a cable has become disconnected or loose)
Television Has No Sound Answer 6: If you have a receiver or surround sound connected to your TV, turn it on and see if you get sound coming from the external speakers.
Television Has No Sound Answer 7: Turn off the TV, cable box, and anything else connected to the TV. Sometimes turning everything off and then back on can fix the problem.

So to clarify, the T.V. turns on but the system doesn't turn on with it? Most external sound systems have their own and separate power supply. You will need to turn it on as well as the T.V.,

Elisa Jed ' http://www.fordtronicvideo.net.au/about-fvs.html

Replace or have replaced the Audio board in the set----a lot of them fail.

Since you just changed signal source (from what I understand) your first goal should be to determine if the problem is in your TV or your signal source, i.e. directv receiver (and btw aren't directv satellite and not cable service?!).

You do that by trying another source for the TV - DVD, blue-ray, over-the-air antenna, anything that is not your new sound source.

Once you know the sound is broken down by the TV and not the TV receiver (or the other way around) you can proceed with troubleshooting.

Sounds like power supply fault in TV. Need to take to TV repair shop.

Unplug,replug the tv about an hour later,let the tv reset itself back to factory setting.Go in the tv menu go to AUDIO.Go down to reset let the sound function in the Tuner baord reset itself to the correct setting.From now on ur tv should not lost suond, when turn tv off and turn tv on anymore.

Try these steps: Turn the volume on your converter box all the way down. Turn the volume on your TV up to ½ way. Now turn up the volume on your converter box until it is at a comfortable level. More information at http://www.ezdigitaltv.com/index.html

sounds like the color wheel is bad

there may be loose contact in speakers inside....
take the technician & your problem will be solved........