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Hello Jim, I'm Shahid and will be happy to assist you. I need additional info of TV symptoms to troubleshoot the problem.This is not an answer so do not rate it.
- Does TV power light lit or blink when press power button on TV or its remote?
Thanks for the info, it seems power supply board or main board problem so lets try easy thing first.
- Have you tried to unplug TV and cable box power cords from wall outlet for 10 minutes to reset, replug back in and check?If not yet, can you try it now and reply back with the result?
I wanted to briefly follow up with you and see how the info worked, and see if that accomplished what you were looking to do!
Please reply back here if there is additional questions.