One way of how to fix a TV with no sound but picture is by changing the display resolution. Maybe the TV doesn't support the computer's display resolution. Try changing the resolution, with the TV connected to the computer.
Here is what you need to do in order to change the display resolution:
Note: If you see more than one resolution listed, select a resolution and refresh rate. If the display turns off when you change the resolution, press the escape key to undo the change.
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