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Hello, my name is***** am one of the JustAnswer.com techs who is going to help you todayI’m sorry to hear you're having trouble with TV, it seems the TV mainboard has got an internal failure which is caused the issue, the following is the first troubleshooting step that should be tried and will help- Disconnect the TV power cord from the power outlet/ socket for 10 minutes to reset, replug back in and check?The above is a simple troubleshooting technique and if that does not work then I'm afraid the mainboard of the TV will be replaced to resolve the problem. Mainboard is the one where Video and HDMI inputs are located
If you're uncomfortable working on that Tv yourself then please contact the local TV repair shop to do that repair work. I trust my input will help you out to make the decision about this TV repair or invest that money in a new replacement TV due to the current pandemic situationIf you have any additional questions, feel free to ask Thanks for using JustAnswer