In that case, he will offer you such a test. This will finally confirm where the damage is.
You need an optical cable with a maximum length of 30 cm (preferably new - good quality).
Prepare a home theater + computer on a short cable. Set up your home theater so that you can hear any sound from your computer. Turn on the TV, and reconnect the plug from the computer to the TV (you can do this with the devices turned on). In this connection, try all possible settings on the TV. If that fails, you're left with a TV failure, a socket, or a problem with the board in the TV.
You need an optical cable with a maximum length of 30 cm (preferably new - good quality).
Prepare a home theater + computer on a short cable. Set up your home theater so that you can hear any sound from your computer. Turn on the TV, and reconnect the plug from the computer to the TV (you can do this with the devices turned on). In this connection, try all possible settings on the TV. If that fails, you're left with a TV failure, a socket, or a problem with the board in the TV.