FOLLOW this steps and fix it. God bless you
Perform some basic troubleshooting steps that
apply to all TVs. These include checking the "Mute" button to see if
it has been pressed, examining the L/R balance to ensure sound is coming from both
speakers and checking the cable connections to auxiliary components such as the
stereo system (which controls external speakers).
Double-check the audio output jacks if you are using an
S-video connection (a single round perforated jack) or component video
connection (a trio of green, blue and red jacks). Those jacks only run the
video signal to the RCA TV. In order to get an audio signal, you'll need to
connect red and white RCA cables to their respective jacks on the TV.
Check the back of the TV for a switch labeled
"Int/Ext." It controls the sound input on some RCA TVs. If you don't
have any separate speakers, the switch should be set to "Int."
Activate the sound set-up feature by pushing the
"Menu" button and scrolling to the sound bar. (This option can
usually be found only on RCA flat-screen and projection screen TVs.) The sound
bar allows you to set the sound from mono to stereo, activate the surround
sound features, adjust the sound for headphone use, set volume levels and
activate preset sound levels for movies, sports, concerts, video games and
other specific sorts of programming. If any of these settings don't match the
configuration of your home theater system, it may cause problems with the
sound. If you're confused about the options, select any settings that read
"Normal" or "Automatic." That should set the RCA TV to factory
standard audio settings.
Press the "Menu" button and scroll to the
"Set-Up" option, then go to "Preferences." You'll see a bar
on the menu marked "Maximum Volume." You can use that to limit how
loud the TV can get, which can cause problems if you don't know it's been set.
Move the arrow on the bar to reset the maximum volume, then hold down the
"OK" button on the remote to hear what that volume sounds like. You
can then listen to the TV as normal.