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How do you receive channels on the TV Glen- is there a Cable/SAT box of some sort connected? Reason being is if you have a box, then all of the video and sound is processed in the box before being sent to the TV.
I would then suggest trying to reboot the box. Shut the TV off, then pull the power cord to the box for 10 seconds and plug it back in. Give it a minute to reboot and turn the TV back on then check the channels and see if the low volume issue is still there.
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Do you need further assistance with this Glen?