Hi thank you for trying that as a rest for me.
This TV requires service by a professional TV repair tech. There is a bad transistor on the main board responsible for this problem. It is a an easy cheap repair but it needs to be isolated as there are a few in this area of the main board. The other option, is to replace main board .
If you are electronically handy, I can help you do that.
I wish I had better news for you, I really do.
In any case, I will stick with you until this is complete.
Please rate my service kindly.
Also it is the only way I am credited for my time and expertise with you.
Once you rate, I will be notified and will add your question to my priority list so you can reach me anytime until this problem is solved.
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Thank you and have a great day!