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Why is my audio randomly cutting out?

I have my linux mint pc hooked up to my LG TV 55LN5758-ZE via HDMI. The TV is hooked up to a speaker setup using the H/P OUT connector. A while ago, maybe half a year or so, the audio started to just not work after waking up from standby or turning off the pc. This was mostly fixed by just rebooting, sometimes i needed to reboot twice though. Now after some time audio started to cut out just whenever. at first i could just change the volume using the volume keys of my keyboard and it would work again after changing it a little. then it took longer and longer and i had to ramp up the volume to max, then min, then max again a couple of times to get it working again. Now it is at a point where it almost never works using the keyboardd. Instead i have to turn the tv audio up and down until it works again (mostly after going up to max volume once and when going down at about 60% it cuts back in).
I assume there is probably some error with the soundboard of the tv. The hdmi cable seems fine. I just dont understand why it changes from being fixable with changing the volume a little, requireing huge changes or a restart and finally just responding to a volume change on the tv. any ideas?

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@thingummybob first you need to establish if it is the TV. Try it without the computer. Use a game console or a dvd/BR player etc to see if the TV volume works. Also, do try a different HDMI cable

This „why it changes from being fixable …..with changing requiring huge changes“ is just a progression of failure and consider it normal. Once you determine it is the TV, its time to take a look at the boards. The audio circuitry is on the main board. The audio IC is most likely what is failing. We would need to see the boards to assist you with that. There are not a lot of schematics gor these boards so we will have to improvise a lot

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Hi @thingummybob,

I would also try using the TV speakers instead of the external speaker setup just in case the problem is with it

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Thingummy Bob will be eternally grateful.
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