Facing TV Problems? Ask a TV Technician.
Hello and sorry you're having problems.
This indicates that the Mainboard has failed- this is the board that processes your HDMI signals and also allows you to select an Input to watch. I am checking now to see if this part is available for purchase. I will be right back.
The part alone is available at the link below for $90 if you're looking to replace the board yourself (it's plug and play- meaning no soldering or special tools are needed to swap it):
That is going to be the only cost effective fix for this is if you provide the labor. The back of the set will have to come off and then the board is exposed.
Alternatively a shop will typically charge $200 parts and labor for this repair, and that is not cost effective since, as you've surmised, the TV can be replaced with a brand new LED of the same size for that cost.
Other than that, there aren't any pushbutton fixes for this issue as the Mainboard does need to be replaced based on these symptoms.
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