Hello my name is Eric,
Welcome to Just Answer
I can help you with your issue,
Please tell me what devices are connected to the TV?
Does it lose sound on every input?
What input cables are you using?
Please tell me your technical ability,
1 I want to fix it myself if possible,
Tools that may be needed Voltmeter and soldering iron
2 I just know how to turn on my TV , want to know what a repairman may charge.
This way, I can help you without getting to technical unless needed.
If you have more questions you can still respond until this post expires,
I will reply asap