Facing TV Problems? Ask a TV Technician.
Hello, Sorry you're having problems.
This is a failure of your Mainboard in the TV- which processes all of the commands in the set- power on/off, input, volume, etc.
That is the only component in the TV that has any control over the set shutting off, or not being able to shut off.
This is a user replaceable part and is something I can help you find if you're looking to repair the set yourself.
This is not something that any settings/adjustments can correct as it is a processor/hardware issue.
That said, let me know if this is something that you're looking to repair yourself, or if you are looking for a repair estimate and service locator and we can proceed.
Feel free to reply back if you need more help, or want to reply back with more details. It does not cost you anything more to reply back once you've rated. Please do rate me positively (at least 3 STARS) and I will continue with you on this as needed. The positive rating ensures I am credited for my work.
The part needed to repair this is available at the link below for your set, and is a plug and play board- meaning no soldering or special tools are needed to replace it:
Alternatively if this is not something that you're comfortable with then a shop will generally charge $250 parts and labor for this repair and can be located at the link below: