You can try cleaning it first. http/www.tomsguide.com/faq/id-2375542/clean-headphone-jack.html
If that doesn't help then you would need to take the TV apart to get to the jack. The board itself might be the problem rather than the jack. Bad solder joint or a crack on the board. You will need to be able to solder to do the repair.
You can try cleaning it first. http/www.tomsguide.com/faq/id-2375542/clean-headphone-jack.html
If that doesn't help then you would need to take the TV apart to get to the jack. The board itself might be the problem rather than the jack. Bad solder joint or a crack on the board. You will need to be able to solder to do the repair.