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TV Repair Questions? Ask a TV Technician for Answers ASAP
Hello, my name is Shahid. I am one of the JustAnswer.com techs who is going to help you today. One moment while I look over your question
Please push the SOURCE button a few times located on the side panel of the TV that might get sticky and causing continuous source input signals, also remove batteries from the TV remote control to make sure the remote isn't sending out source input signals
If the problem still persists then I'm afraid it would be the mainboard (main control board) internal failure and the mainboard replacement is needed to resolve the problem. I hope this info will help. If you have any additional questions, feel free to askThanks for using JustAnswer