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The sound is probably set to the SAP channel (language) and the SAP channel is not active on the program you are watching. Just push the SAP button on the remote. The button might be labelled SAP or LANG. This will return you to the main sound channel which is always active.
Press the MTS on the remote control handset to select STEREO, MONO or SAP. All the options will be available only when the current TV channel is broadcasting that option. Channels will not always carry programes, that have all MTS options. If "STEREO" appears on the screen when you select a channel means stereo sound is available with current programme. You can hear sound from both speakers. If broadcast is not strong and clear, stereo sound will not be available. Press "MTS" button to change it to "Mono". This will eliminate the noise. If "MONO" appears on the screen when you select a channel, stereo effect will not be availabe, even though you have set it to stereo. If "SAP" appears when you select a channel 'Second Audio Programe' [SAP] broadcasting is available for that programme. Press the "MTS" button to 'SAP' and you can hear that programe in different language or some other kind of audio.
You most likely have the SAP mode activated. Look for a button on your remote or an item in the on-screen menus of your television called MTS or SAP. You want to set this to "Normal" or "Stereo" (or even "MONO") mode to hear the regular television sound.
If it is in SAP (Secondary Audio Program) mode, as I believe yours is, you will hear other audio. Often this is a translation to another language, such as Spanish, and other times (notably with PBS stations) it is an unrelated audio (often music) feed.
Instead of explaining the SAP/Stereo function to you, the easiest way to get the TV back to normal is while the set is on press the ACTION and POWER buttons at the same time and hold them until the CHK screen appears. Once that does release the buttons and then press the action button again to exit the CHK screen. Your TV is now back to the factory settings and will need to have the channels programmed again. By the way the SAP/STEREO button on the remote should be near the upper left hand corner of the remote itself.