Hello there,
The problem simply is that the sound IC is bad that is why the sound went off completely. First be sure that the television is not on mute, then you go ahead to replace the sound IC.
To replace the sound IC, turn to the back of the television, but before you do so, turn of the television and allow the high voltage dissipate for a while before you start working on it.
Unscrew the screws around the television, then you open up the back cover, then you trace the wires of the speakers, it will lead you to a board, on that board is where the IC that is bad is lying.
Have the board replaced or fix the bad IC and the television will produce good sound once again.
Hope this helps.
Goodluck
Elect_Comp
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