Check for two locations - on the back of the set itself, lower right hand side. A switch for the speakers (EXT -up-, INT -down-) should be in the down INT position for the TV's internal speakers. Also on the TV screen go to MENU> AUDIO> SPEAKERS> press enter to check the ON button. Of course the other option is a separate amp (using the rear Audio Output RCA jacks), or below that the LEFT/RIGHT external speaker connectors.
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I JUST GOT HOME AN TRIED TO TURN MY JVC PLASMA TV ON. THE TV WILL NOT TURN ON. EVERYTHING ELSE HAS POWER TO INCLUDE THE TV BUT THERE IS NO PICTURE OR SOUND. BLANK SCREEN. THE BLUE POWER LIGHT IS FLASHING ON AND OFF. THE MODEL NUMBER LT-42P789
this is a very common problem just unplug tv for 5 minutes it
should fix it . simple fix most of the time with rca and proscan.
If that does not do it go into menu scroll down to audio and then press on .
The best part is that you like the picture and that makes it worth repairing,before you call for an estimate tap on the side of the set and/or the jack panel to see if the sound comes back if it does react you are looking for a loose conection and the repair should not be expensive but if it does not react you might be looking at the stereo amp board and that can be expensive depending in your location,If you are familiar with tv service you can go as far as removing the back cover and taping on the chassis or in the area were the internal speaker wires conect to the chassis or the amp board but if you are not too familiar be safe and call for assistance from a servicer.
FDirstly, you should not connect your TV to a Sound System. If you desire to listen to your Broadcast TV , and enhance the listening experience,I suggest you use the Audio L & R outputs of your Cable Box to your Sound System AUX IN , and Video Out to the TV's Video IN socket. Then you will recieve a better picture and a enhanced sound quality. But just directly connecting the TV's Audio Out to the Sound System will make scarcely any difference.