u/Impossible-Appeal130

I've had this TV for at least 7 years. I've and had to repair the backlight issue a few years ago but besides that its worked fine, until recently. Out of nowhere the sound cut out and now remains silent.

I tried putting completely new speakers in it and they worked for about a day. I thought I'd solved it, then the sound went out again, so I know its not a problem with the speakers. For a moment I was able to fix this with a simple "reset AV settings" or turning the tv off and on again. Recently though, its gone completely quiet and I cant fix it, no matter what I try. At this point the TV is still completely silent, the screen works perfect though. Does anyone know how I can fix this?