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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.
Thank you for your patience while I investigated your question. I will need some additional information in this instance as the information provided initially has not been very clear, I hope that is ok with you.
As I have not heard back from you with the information requested, I will have to provide my answer based on the information you have provided us already, this may not be accurate, however, if you do wish to provide me with more information I can then look into investigating further!
Based on the information you have provided, it sounds like you are trying to change the source on the Television so that you can continue using your TVonics PVR receiver. I would recommend you follow the steps I have attached below to assist you applying the changes;
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!