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Greetings and Welcome to JustAnswer.
I am Andrew your Support Technician with over 30 years of experience, it can be very frustrating when electronic devices go wrong but from my experience misconfiguration are usually the problem and they can be quickly resolved with the right advice and assistance. Please allow me a few moments to investigate, I will respond at the earliest either requesting more information or providing further information.
I have investigated the information you have provided and it sounds like you have a query relating a Television which has no sound. I would suggest problems like these can be quickly resolved if there not hardware related, when I say hardware related, I mean a a fault with the hardware. I will recommend some steps I would like you to exercise and let me know the outcome on completion.
I hope the information provided today helps and if you have any questions or require any further assistance, please let me know and I will do my best to answer those!