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The Video (Picture) is SEPERATE from the Audio component of the TV. One can work when the other has gone south. From what I see, the Audio controller board may have been damaged somehow and needs to be replaced. Contact a serviceman for details.
This television must have the ability to broadcast channels in SAP. Look for an SAP or MTS or AUDIO button on your Sylvania remote. The audio menu might be the place to find this setting as well. You want to remove the SAP and have the tv in either mono or stereo.
You can connect your Sylvania LC320ss8 to a computer. There is a socket at the back of your TV to connect it with a PC via VGA cable. One end of that cable must be connected to TV, and the other end of the VGA cable must be connected to PC's monitor out jack.. You have to purchase on VGA cable for this purpose, and is available at most of the electronic spare part shops. A "mini-plug audio cable" also is needed to connect the audio from PC to TV. Its one end to be connected to PCs Audio Line Out jack and its other end to TVs PC in audio jack. Both Jacks can be located at the back side of the TV. After connecting it select the TV to receive PC signals according to its manual says. OK.
Go into tv menu go to PICTURE go down to reset u should get the tv in Factory setting,that the best reconmended settig for the tv.The sound setting put in stereo.The Power Saving put in advanced,should used less,save about 20% less power comsumming.
This could be you audio out put stage malfunctioning. As a test connect a head set to you RCA connectors for audio (Red and White RCA Audio out jacks) and see if there is sound (there should not be if the audio amp has malfunctioned). In addition check your setup menu to make sure the TV is not on mute mode. If the TV is not on mute and you do not hear sound from the headset connected to the audio out RCA jacks, then we can start looking at the possibility of an internal circuit problem.
I have the schematic so if you need help, and have a background in electronics, we can get this fixed. If you do not have a background in electronics I would suggest getting a qualified TV technician to fix this TV for you.
your problem is in sound section only.
1 signal line for sound coming from vif section
2 supply to audio section.
3 component fail in audio output section.
4 loose contact in audio section
5 speakr & its connecting wire.