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What is the model number of your TV?
where would that be located on the tv?
At the back of the TV, usually printed on a white sticker.
model number is XXXXX follows
I'm assuming that you check that the volume is not set low or the TV is not in MUTE.
This problem of no audio on your TV is caused by a MUTE transistor that failed. If you are doing the repair on your TV, I can give you the location and part number.
I hope this answers your question and if you have more please feel free to ask.
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When you turn the volume up does it display on the screen that the volume is going up?